Fluke 5720A Bedienungsanleitung

® 5700A/5720 A Series II Multi-Function Calibrator Service Manual PN 601630 J u ne 199 6 Re v . 1, 3/02 ©1996, 2002 Fluke Corporation, Al l rights reserved. Printed i n U.S.A. All product names are trademarks of their respective companies.[...]

LIMI TED W ARRANTY & LI MITATI O N OF LIABI LI TY Each Fluke product is warr ant ed t o be free fr om def ects in mater ial and workmanship under normal use and ser vice. The warranty per iod is one year and begins on t he dat e of shipment. Par ts, product r epair s and services are warr ant ed for 90 days. This warranty ext ends only t o the [...]

Interference Information This equipment generates and uses radio frequency ener gy and if not installed and used in strict accordance with the manufacturer’s instr uctions, may cause interference to radio and television reception. It has been type tested and found to comply with the limits for a Class B computing device in accordance with the spe[...]

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OPERATOR SAFETY SUMMARY WARNING HIGH VOLTAGE is used in the operation of this equipment LETHAL VOLTAGE may be present on the terminals, observe all safety pr ecautions! To avoid electri cal shock hazard, the operat or should not elect rically contact the out put hi or sense hi bindi ng posts. During operati on, let hal voltages of up t o 1100V ac o[...]

Symbols Marked on Equipment DANGER — High Volt age Protective ground (earth) terminal Attention — refer to the manual. This symbol indicates that information about the usage of a feature is contained in the manua l. Power Source The 5700A/5720A Series II is intended to operate from a power source that w ill not apply more than 264V ac rms betwe[...]

SERVICING SAFETY SUMMARY FOR QUALIFIED SERVICE PERSONNEL ONLY Also refer to the precedin g Operator Safet y Su mm ary Do Not Service Al one Do not perfor m internal ser v ice or ad j ust m ent of this product unless another person capable of renderin g first aid and resuscitation is present. Use Care When Servicing With Power On Dan g erous v olta [...]

FIRST AID FOR ELECTRIC SHOCK Free the Victi m Fr om the Li ve Conductor Shut off high voltage at once and ground the circuit. If high voltage cannot be turned off quickly, ground the circuit. If the circuit cannot be broken or grounded, use a board, dry clothing, or other nonconductor to free the victim. Get Help! Yell for help. Call an emergency n[...]

i Table of Contents Chapter Title Page 1 Introduction and Specifications........................................................ 1-1 1-1. Introduction .......................................................................................... 1-3 1-2. Contacting Fluke ..................................................................................[...]

5700A/5720A Series II Service M anual ii 1-34. General Specifications.......................................................................... 1-36 1-35. Auxiliary A mplifier Specifications ...................................................... 1-37 2 Theory of Operation ........................................................................... 2[...]

Contents (c ontinued) iii 2-49. Decoding and Timing Circuitry ................................................... 2-28 2-50. Control Display Circuitry ............................................................ 2-29 2-51. Output Display Circuitry ............................................................. 2-30 2-52. Keyboard Scanner Circuitry ..[...]

5700A/5720A Series II Service M anual iv 2-113. ADC Amplifier ............................................................................ 2-69 2-114. ADC Input Selection.................................................................... 2-69 2-115. ADC Circuit ................................................................................. 2-70 [...]

Contents (c ontinued) v 2-169. Ohms Main A ssembly (A10) ........................................................... 2-109 2-170. Selection of Resistance Values .................................................... 2-109 2-171. Ohm s Main Assembly Support of Current Function Calibration 2-112 2-172. Ohms Dig ital Control ............................[...]

5700A/5720A Series II Service M anual vi 3-27. Wideband AC Voltage Module Output Verification ....................... 3-38 3-28. Wideband Output Accuracy at 1 kH z Test ........................................... 3-39 3-29. Wideband Output Flatness Test ........................................................... 3-40 3-30. Wideband Flatness Calibra[...]

Contents (c ontinued) vii 5-13. Troubleshooting the DAC A ssembly (A11) .................................... 5-58 5-14. Duty- cycle Control Circuit .......................................................... 5-63 5-15. ADC Circuit ................................................................................. 5-67 5-16. Buffered Reference SIP A ss[...]

5700A/5720A Series II Service M anual viii[...]

ix List of Tables Table Ti tle Page 1-1. Auxiliary Amplifier Data....................................................................................... 1-6 1-2. 5720A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 1-14 1-3. 5700A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 1-15 1-4. DC Voltage Seconda[...]

5700A/5720A Series II Service M anual x 2-6. Front Panel Memory Map ...................................................................................... 2-29 2-7. Control Lines for the Keyboard LEDs................................................................... 2-32 2-8. Unregulated Supplies from the Filter Assembly ..........................[...]

Contents (c ontinued) xi 3-38. Test Record for Flatness Check of the AC 2 mV Range ....................................... 3-70 5-1. Verifying Multiplexer U 6 ..................................................................................... 5-46 5-2. Ohms Main Resistance Tolerance ................................................................[...]

5700A/5720A Series II Service M anual xii[...]

xiii List of Figures Figure Title Page 1-1. Time and Costs: Calibrator Calibration ................................................................. 1-10 1-2. Volt-Hertz Capability ............................................................................................ 1-22 2-1. Digital Section Block Diagram.....................................[...]

5700A/5720A Series II Service M anual xiv 2-31. Ohms Main Assembly Simplified Schematic........................................................ 2-111 2-32. Two-Wire Lead Drop Compensatin Circuit .......................................................... 2-114 2-33. Calibration to an External 10 k Ω Standard .......................................[...]

Contents (c ontinued) xv 5-18. Waveform at TP4, Calibrator Set to 0V ................................................................ 5-59 5-19. Waveform at TP4, Calibrator Set to 6.5V ............................................................. 5-60 5-20. Waveform at TP7 ............................................................................[...]

5700A/5720A Series II Service M anual xvi[...]

1-1 Chapter 1 Introduction and Specifications Title Page 1-1. Introduction .......................................................................................... 1-3 1-2. Contacting Fluke .................................................................................. 1-4 1-3. About this Manual ................................................[...]

5700A/5720A Series II Calibrator Service Manual 1-2 1-30. Resistance Specifications ..................................................................... 1-23 1-31. DC Current Specifications ................................................................... 1-27 1-32. AC Current Specifications ......................................................[...]

Introduction and Specifications Introduction 1 1-3 1-1. Introduction The Fluke Model 5700A/5720A Series II calibrators are precise instruments that calibrate a wide variety of electrical measuring instruments. These calibrators maintain high accuracy over a wide ambient temperature range, allowing them to test instruments in any environment, elimin[...]

5700A/5720A Series II Calibrator Service Manual 1-4 • Extensive internal self testing and diagnostics of analog and digital functions. • A traceable calibration procedure for all modes and ranges that requires only 10V, 1 Ω , and 10 k Ω external standards, with only occasional independent verification. • Fast, simple, automated calibratio[...]

Introduction and Specifications Additional Instruction Manuals 1 1-5 • Using auxiliary amplifiers: Chapter 4 • Self calibration: Chapters 1 and 7 • Remote operation (IEEE-488 or serial) : Chapter 5 • Options and accessories: Chapters 2 and 8 • Instrument specifications: The end of this Chapter • Theory of operation: Chapter 2 of the 570[...]

5700A/5720A Series II Calibrator Service Manual 1-6 1-7. Auxiliary Amplifiers The Fluke Model 5725A Amplifier is available to extend the high voltage performance and current range of the calibrator: Interface connectors on the calibrator’s rear panel accept cables to directly operate a 5725A. Three amplifiers can be connected to the calibrator at[...]

Introduction and Specifications Support Equipment and Services 1 1-7 ordering instructions for this support equipment and other Fluke instruments, refer to the Fluke catalog, or contact a representative at a Fluke Sales and Service Center. 1-10. 732B Direct Volt age Reference Standard The Fluke 732B is a rugged, easily transported solid state direc[...]

5700A/5720A Series II Calibrator Service Manual 1-8 when the calibrator is returned to a standards laboratory for periodic verification. The 5700A / 5720A Series II Service Manual contains the wideband flatness calibration procedure. Chapter 7 of this manual contains the wideband gain calibration procedure. 1-14. Service Centers A worldw ide networ[...]

Introduction and Specifications Calibrating the 5700A/5720A Series II Calibrator 1 1-9 1-16. Calibrating the 5700A/5720A Series II Calibrator The traditional practice of returning a calibrator to a standards laboratory at regular intervals for a full calibration is time consuming, expensive, and disruptive to the task to which the calibrator is bei[...]

5700A/5720A Series II Calibrator Service Manual 1-10 COST $ COST $ CALIBRATION CYCLE CALIBRATION CYCLE TRADITIONAL CALIBRATOR CALIBRATION 5700A/5720A SERIES II CALIBRATION TIME TIME f1-1.e ps Figure 1-1. Time and Costs: Calibrator Calibration 1-17. The Calibration Process Calibration requires only three external standards: 10V, 1 Ω , and 10 k Ω[...]

Introduction and Specifications Calibration Check 1 1-11 • Except for the internal ac/dc transfer standard, the internal check standards are directly calibrated by traceable external standards every time the 5700A/5720A Series II is calibrated. • The internal ac/dc transfer standard is never adjusted, so its traceability is not disturbed by cal[...]

5700A/5720A Series II Calibrator Service Manual 1-12 • The process is consistent and automatic: it does not require an operator’s assistance. Each calibration check produces a new set of data points for accumulating a historical record. When this process is externally automated, significant history can be accumulated much faster than with a man[...]

Introduction and Specifications Specifications 1 1-13 You do not need to add anything to absolute uncertainty to determine the ratios between the calibrator’s uncertainties and the uncertainties of your calibration workload. Relative uncertainty specifications are provided for enhanced accuracy applications. These specifications apply when range [...]

5700A/5720A Series II Calibrator Service Manual 1-14 1-28. DC Voltage Specifications Table 1-2. 5720A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 5720A 99% 99 % Confidence Level Range Resolution Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >1 V/m but ≤ 3 V/m, add 0.01% of range. R[...]

Introduction and Specifications DC Voltage Specifications 1 1-15 Table 1-3. 5700A Series II DC Voltage Specifications: 99 % and 95 % Confidence Levels 5700A 99% 99 % Confidence Level Range Resolution Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >1 V/m but ≤ 3 V/m, add 0.01 % of range. Relative Uncertain t[...]

5700A/5720A Series II Calibrator Service Manual 1-16 Table 1-4. DC Voltage Secondary Performance Specifications and Operating Characteristics Temperature Coeffici ent Adder [Note 2] Noise Range Stabilit y [Note 1] ± 1 °C 10 °-40 °C 0 °-10 °C and Linearity ± 1 °C Bandwidt h 0.1-10 Hz Bandwidth 10 Hz-10 kHz 24 Hours 40°-50 °C pk-pk RMS ± ([...]

Introduction and Specifications AC Voltage Specifications 1 1-17 1-29. AC Voltage Specifications Table 1-5. 5720A Series II AC Voltage Specifications: 99 % Confidence Level 5720A 99% 99 % Confidence Level Range Resolution Frequency Absolute Un certai nty ± 5 °C from calibrati on tem perature Relative Uncertain ty ± 1 °C 24 Hours 90 Days 180 Day[...]

5700A/5720A Series II Calibrator Service Manual 1-18 Table 1-6. 5720A Series II AC Voltage Specifications: 95 % Confidence Level 5720A 95% 95 % Confidence Level Range Resolution Frequency Absolute Un certai nty ± 5 °C from calibrati on tem perature Relative Uncertain ty ± 1 °C 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days Hz ± (ppm output [...]

Introduction and Specifications AC Voltage Specifications 1 1-19 Table 1-7. 5700A Series II AC Voltage Specifications: 99 % Confidence Level 5700A 99% 99 % Confidence Level Range Resolution Frequency Absolute Un certai nty ± 5 °C from calibrati on tem perature Relati ve Uncertai nty ± 1 °C 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days Hz ±[...]

5700A/5720A Series II Calibrator Service Manual 1-20 Table 1-8. 5700A Series II AC Voltage Specifications: 95 % Confidence Level 5700A 95% 95% Confidence Level Range Resolution Frequency Absolute Un certai nty ± 5 °C from calibrati on tem perature Relative Uncertain ty ± 1 °C 24 Hours 90 Days 180 Days 1 Year 24 Hours 90 Days Hz ± (ppm output +[...]

Introduction and Specifications AC Voltage Specifications 1 1-21 Table 1-9. AC Voltage Secondary Performance Specifications and Operating Characteristics Stabilit y ± 1 °C [Note 1] Temperature Coeffici ent Maximum Distortion Range Frequency 24 Hours 10°-40 °C 0°-10 °C and 40°-50 °C Output Impedance Bandwidth 10 Hz-10 MHz Hz ± µ V ±µ V/?[...]

5700A/5720A Series II Calibrator Service Manual 1-22 Table 1-9. AC Voltage Secondary Performance and Operating Characteristics (continued) 5725A Amplifier: Stabilit y ± 1 °C [Note 1] Temperature Coefficient Adder Distortion Bandwidth Range Frequency 24 Hours 10°-40 °C 0°-10 ° C and 40°-50 °C Load Regulation [Note 2] 10 Hz-10 MHz ± (% outpu[...]

Introduction and Specifications Resistance Specifications 1 1-23 1-30. Resistance Specifications Table 1-10. 5720A Series II Resistance Specifications: 99 % and 95 % Confidence Levels 5720A 99% 99% Confidence Level Nomi nal Value Absolute Uncertainty of Characteriz ed V alue ± 5 °C from calib rati on temperature [Note 1] Relative Uncertain ty ± [...]

5700A/5720A Series II Calibrator Service Manual 1-24 Table 1-11. 5700A Series II Resistance Specifications: 99 % and 95 % Confidence Levels 5700A 99% 99 % Confidence Level Nomi nal Value Absolute Uncertainty of Characteriz ed V alue ± 5 °C from calib rati on temperature [Note 1] Relative Uncertain ty ± 1 °C 24 Hours 90 Days 180 Days 1 Year 24 H[...]

Introduction and Specifications Resistance Specifications 1 1-25 Table 1-12. Resistance Secondary Performance Specifications and Operating Characteristics Nomi nal Value Stab ility ± 1 °C [Note 1] Temperature Coefficient Adder [Note 2] Full Spec Load Range Maxim um Peak Current Maximu m Difference of Characterized Two-Wire Adder active compensati[...]

5700A/5720A Series II Calibrator Service Manual 1-26 Table 1-13. Current Derating Factors Nominal Value Value of Derating Factor K for Over or Under C urrent Ω Two-Wire Comp I < I L [Note 1] Four-Wire I < I L [Note 1] Four-Wire I U < I < I max [Note 2] SHORT 1 1.9 10 19 100 190 1 k 1.9 k 10 k 19 k 100 k 190 k 1 M 1.9 M 10 M 19 M 100 M[...]

Introduction and Specifications DC Current Specifications 1 1-27 1-31. DC Current Specifications Table 1-14. 5720A Series II DC Current Specifications: 99 % and 95 % Confidence Levels 5720A 99% 99 % Confidence Level Range Resolution Absolute Un certai nty ± 5 °C from calib rati on temperature. For fields strengths >0.4 V/m but ≤ 3 V/m, add 1[...]

5700A/5720A Series II Calibrator Service Manual 1-28 Table 1-15. 5700A Series II DC Current Specifications: 99 % and 95 % Confidence Levels 5700A 99% 99 % Confidence Level Range Resolution Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >0.4 V/m but ≤ 3 V/m, add 1% of range. Relative Uncertain ty ± 1 ° C 2[...]

Introduction and Specifications DC Current Specifications 1 1-29 Table 1-16. DC Current Secondary Performance Specifications and Operating Characteristics Temperature Coefficient [Note 2] Noise Range Sta bility ± 1 °C [Note 1] 10 °-40 °C 0 °-10 °C and Compliance Limits Burden Voltage Adder [Note 3] Maximu m Load for Full Accuracy Bandwidth 0.[...]

5700A/5720A Series II Calibrator Service Manual 1-30 1-32. AC Current Specifications Table 1-17. 5720A Series II AC Current Specifications: 99 % Confidence Level 5720A 99% 99 % Confidence Level Range Resolution Frequency Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >0.4 V/m but ≤ 3 V/m, add 1 % of range. [...]

Introduction and Specifications AC Current Specifications 1 1-31 Table 1-18. 5720A Series II AC Current Specifications: 95 % Confidence Level 5720A 95% 95 % Confidence Level Range Resolution Frequency Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >0.4 V/m but ≤ 3 V/m, add 1 % of range. Relative Uncertain t[...]

5700A/5720A Series II Calibrator Service Manual 1-32 Table 1-19. 5700A Series II AC Current Specifications: 99 % Confidence Level 5700A 99% 99 % Confidence Level Range Resolution Frequency Absol u te Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >0.4 V/m but ≤ 3 V/m, add 1 % of range. Relative Uncertain ty ± 1 °C[...]

Introduction and Specifications AC Current Specifications 1 1-33 Table 1-20. 5700A Series II AC Current Specifications: 95 % Confidence Level 5700A 95% 95 % Confidence Level Range Resolution Frequency Absolute Un certai nty ± 5 °C from calibrati on tem perature For fields strengths >0.4 V/m but ≤ 3 V/m, add 1 % of range. Relative Uncertain t[...]

5700A/5720A Series II Calibrator Service Manual 1-34 Table 1-21. AC Current Secondary Performance Specifications and Operating Characteristics Stabilit y ± 1 °C [Note 1] Temperature Coeffici ent [Note 2] Compliance Limits Maximum Resistive Load Noise and Distortion Range Frequency 24 Hours 10°-40 °C 0°-10 ° C and 40°-50 °C For Full Accuracy[...]

Introduction and Specifications Wideband AC Voltage (Option 5700-03) Specifications 1 1-35 1-33. Wideband AC Voltage (Option 5700-03) Specifications Table 1-22. Wideband AC Voltage (Option 5700-03) Specifications Specifications apply to the end of the cable and 50 Ω termination used for calibration Range Resolution Absolute Un certai nty ± 5 °C[...]

5700A/5720A Series II Calibrator Service Manual 1-36 1-34. General Specifications Warm-Up Time: Twice the time s ince last warm ed up, to a maximum of 30 minutes. System installation: Rear output configuration and rack - mount kit available. Standard interfaces: IEEE-488, RS-232, 5725A, 5205A or 5215A, 5220A, phase lock in (BNC), phase reference ou[...]

Introduction and Specifications Auxiliary Amplifier Specifications 1 1-37 1-35. Auxiliary A mplifier Specificatio ns For complete specifications, see the 5205A and 5220A Op erators Manuals. 5205A (220V - 1100 V ac, 0 V - 1100 V dc) Overshoot: < 10 % Distortion (bandwidth 10 Hz - 1 MH z): 10 Hz - 20 kH z 20 kHz - 50 k Hz 50 kHz - 100 k Hz 0.07 % [...]

5700A/5720A Series II Calibrator Service Manual 1-38[...]

2-1 Chapter 2 Theory of Operation Title Page 2-1. Introduction .......................................................................................... 2-5 2-2. Calibrator Overview ............................................................................. 2-5 2-3. Internal References ............................................................[...]

5700A/5720A Series II Calibrator Service M anual 2-2 2-36. Glue Logic ................................................................................... 2-25 2-37. RAM (Random- Access Memory) ................................................ 2-25 2-38. ROM (Read-O nly Mem ory) ........................................................ 2-25 2-39. Elec[...]

Theory of Operation Introduction 2 2-3 2-98. Internal CAL Z ero Amplifier ....................................................... 2-59 2-99. Switch Matrix 5725A Amplifier I nterface .................................. 2-61 2-100. DAC Assem bly (A11) ...................................................................... 2-61 2-101. Basic DAC Theory o[...]

5700A/5720A Series II Calibrator Service M anual 2-4 2-155. High Voltag e Assemblies (A14 and A15) ....................................... 2-96 2-156. 1100V AC Range ......................................................................... 2-96 2-157. 1100V DC Range ......................................................................... 2-98 2-15[...]

Theory of Operation Introduction 2 2-5 2-1 . Introduct ion This section provides theory of operation in increasing level of detail. The calibrator is first broadly defined in terms of digital functions (relating to the Digital Motherboard assembly) and analog functions (relating to the Analog Motherboard assembly). The interrelationship of these tw[...]

5700A/5720A Series II Calibrator Service M anual 2-6 After initial functional verification of the Fluke Thermal S ensors, their characteristics only change by less than 1/10th of the allowed ac/dc error per year. External calibration of the ac voltage function of the Calibrator consists of verifying that the Calibrator meets its specifications. 2-6[...]

Theory of Operation Analog Section Overview 2 2-7 ahp003f.eps Figure 2-1. Digital Section Block Diagram[...]

5700A/5720A Series II Calibrator Service M anual 2-8 These analog assemblies are interfaced to the Analog Motherboard assembly (A3). The guarded digital bus generated by the guard crossing portion of the Regulator/Guard Crossing assembly controls all analog assemblies except the Filter/PA Supply. The Guard Crossing interfaces with the unguarded CPU[...]

2 Theory of Operation 2-9 Theory of Operation Figure 2-2. Analog Section Block Diagram, Part 1 ahp33f.eps[...]

5700/5720A Series II Calibrator Service Manual ahp34f.eps Figure 2-3. Analog Section Block Diagram, Part 2 2-10[...]

Theory of Operation Functional Description Presented by Output Function 2 2-11 The 1100V range is generated by the High Voltage/H igh Current assembly (A15) operating in conjunction with the Power Amplifier assembly and the H igh Voltage Control assembly. The 11V range of the DA C assembly is routed to the High Voltage/High Current assembly w hich [...]

5700A/5720A Series II Calibrator Service M anual 2-12 2-12. Wideband AC V Functional Descri pt ion (Opt i on -03) The Wideband AC Voltage module (O ption -03) consists of the Wideband Oscillator assembly (A6) and the Wideband Output assembly (A 5). There are two wideband frequency ranges: • 10 Hz to 1.1 MHz • 1.2 MHz to 30 MHz During operation [...]

Theory of Operation System Interconnect Detailed Circuit Description 2 2-13 2-15. Ohms Functional Descri pt ion Two assemblies function as one to supply the fixed values of resistance: • Ohm s Main assembly (A10) • Ohms Cal assembly (A 9) All of the resistance values except the 1 Ω , 1.9 Ω , and short are physically located on the Ohms Main[...]

5700A/5720A Series II Calibrator Service M anual 2-14 2-18. Transf ormer Assembl y (A22) The Transformer assembly receives ac line inputs routed through the A4 Digital Motherboard. This assembly supplies outputs throughout the Calibrator, all of which are routed through the A4 Digital Motherboard. The Transformer assembly, the filter portion of the[...]

2 Theory of Operation ahp35f.eps 2-15 Functional Description Presented by 0utput Function Figure 2-4. System Interconnections[...]

5700/5720A Series II Calibrator Service Manual 2-16 Figure 2-4. System Interconnections (cont) ahp35f.eps[...]

Theory of Operation System Interconnect Detailed Circuit Description 2 2-17 Table 2-1. Analog Motherboard Connectors Motherboard Connector Connected to Assembly J101 Wideband Osc illator Assembly (A6) J111 Wideband Output Assem b ly (A5) J201 and J202 Switch Matrix Assembly (A8) J211 and J212 Current/Hi-Res As sembly (A7) J301 and J302 Ohms M a in [...]

5700A/5720A Series II Calibrator Service M anual 2-18 2-20. Front/Rear Binding Post s An internal cable can be configured to enable either the front panel or panel binding posts. When compared to front panel binding posts, the rear panel provides the same OUTPUT HI, OUTPUT LO, SENSE HI, SENSE LO, AND V GUARD func tions. Al so, the rear panel provi [...]

Theory of Operation Digital Section Detailed Circuit Description 2 2-19 Table 2-2. Supplies Generated by the Digital Power Supply Signal Name Test Point Nominal Output Tolerance Current Limit Rated Output +75V OUT TP2 73V +/-8% 121 mA 100 mA +35V OUT TP5 35V +/-7% 52 mA 40 mA +12 VOLTS TP8 12V +/-5% 1.5A 700 mA -12 VOLTS TP10 12V +/-5% 1.5A 450 mA [...]

5700A/5720A Series II Calibrator Service M anual 2-20 flow to the output. Diode CR16 protects this circuit from reverse voltage and C4 is a bypass capacitor. Inductor L2 filters the regulated output. Resistor R13 is a bleed-off resistor for C3. 2-28. +75V Power Supply The +75V power supply powers the grid drivers and anode drivers on the front pane[...]

Theory of Operation Digital Section Detailed Circuit Description 2 2-21 2-30. CPU (Central Processing Uni t ) Assembl y ( A20) The CPU (C entral Processing Unit) for the Calibrator is a single-board computer based on a 68HC000 microprocessor. The CPU assembly communicates with the G uarded Digital section, the Front Panel assembly, and the Rear Pan[...]

5700A/5720A Series II Calibrator Service M anual 2-22 ahp004f.eps Figure 2-5. CPU Assembly Block Diagram[...]

Theory of Operation Digital Section Detailed Circuit Description 2 2-23 Table 2-3. CPU Acronym G lossary Signal Name Function A01-A23 Address lines ADCLKCS* Clock/calendar (U33) chip select AS* Address strobe BERR* Bus error BGACK* Bus grant acknowledge BR* Bus reques t BRPDRTINT* Rear panel DUART interrupt BRPDTK* Rear panel data transfer ack nowl[...]

5700A/5720A Series II Calibrator Service M anual 2-24 2-33. Watchdog Tim er The watchdog timer circuitry uses a 74HC4020 binary counter (U 11) to divide the 450 Hz from t he clock gener ation cir cuit to produc e interr upt DOGINTH, signif ying that t he system may be locked up. This interrupt is generated 1.14 seconds after the last DOGCLR2 signal[...]

Theory of Operation Digital Section Detailed Circuit Description 2 2-25 2-35. Interr upt Controller PLD U10 is the priority interrupt controller. T he interrupt controller reads incoming interrupts and interrupt control lines, then encodes the highest priority interrupt into the interrupt level for the 68HC000. When the 68HC000 responds to an inter[...]

5700A/5720A Series II Calibrator Service M anual 2-26 2-39. Electrically-Er asable Pr ogr am m able Read- Only Mem or y ( EEPRO M ) IC U13 is an EEPROM. The socket accommodates a 32K x 8 device (32 KB of storage.) A jumper is provided to allow an 8K x 8 (8 K B) device to be used in place of the 32 KB device. The Calibrat or is shipped wit h a 32KB [...]

Theory of Operation Digital Section Detailed Circuit Description 2 2-27 2-42. Clock Filter Circuit The clock filter circuit generates a 3.6864 MHz 200 mV sine wave for the R ear Panel and Front Panel assemblies. This circuit buffers the 3.6864 MHz Clock with an inverter in U3. The circuit contains dc-blocking capacitor C80, two stages of a low pass[...]

5700A/5720A Series II Calibrator Service M anual 2-28 2-46. Front Panel Assembly (A2) The Front Panel assembly, operating in conjunction with the Keyboard assembly (linked by a cable), is the operator interface to the Calibrator. This assembly contains two separate vacuum-fluorescent displays: the Control Display and the Output D isplay. Each displ[...]

Theory of Operation Digital Section Detailed Circuit Description 2 2-29 Table 2-6. Front Panel Memory Map Name Read/Write Address OTDCS* R/W D02000 to D027FF DMDCS* R/W D 02800 to D02FFF ENCODER CS* R D03000 to D033FF ENCODERRESET* W D03000 to D033FF LED_OUTPUT_C NTRL R D03400 to D037FF LED_LATCH_EN W D03400 to D037FF KEYBOARDCS* R/W D03800 to D03B[...]

5700A/5720A Series II Calibrator Service M anual 2-30 transistor s. When AOUT is high, U13B turns Q2 and Q4 on. Q4 tur ns Q6 on, providing a path for the filament current through Q2 and Q6. Zener diode VR2 provides the dc voltage offset necessary for proper filament operation. Then when BOU T is high, U13A turns Q1 and Q3 on. Q1 turns Q5 on, provid[...]

Theory of Operation Digital Section Detailed Circuit Description 2 2-31 Output display filament driver circuitry consists of transistors Q7-Q12 and zener diodes VR3 and VR 4, plus associated resistors. The transistors are driven by 7406 open- collector dr ivers U13C and U13D. These drivers are cont rolled by AOUT and BOUT as in the Contr ol Display[...]

5700A/5720A Series II Calibrator Service M anual 2-32 interrupt by reading U24. On a read, indicated by a logic low on ENCODERCS*, U24 places the contents of a seven-bit up/down counter on the data bus. The counter keeps track of the number of 180º rotations that have occurred between the time the interrupt was first initiated and the counter is r[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-33 2-56. Analo g Section Detailed Circuit Descrip tion Detailed descriptions of each assembly in the analog section are provided here. Simplified schematics are provided to supplement the text. 2-57. Filter/PA Suppl y ( A18) , Low -voltage Fi l ter/Regulat or Sect i on The Filter a[...]

5700A/5720A Series II Calibrator Service M anual 2-34 2-58. Unregulated OSC Supplies Line OSC COM is the return path for the +15 OSCR and -15 OSCR supplies. These supplies use a full-wave center-tapped configuration. They consist of bridge rectifier CR3 and two filter capacitors, C 4 and C6, for +15 OSC R and -15 OSCR , respectively. Inputs are fus[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-35 2-64. FR2 Supplies FR2 COM is the return path for unregulated +30 FR2R supply and regulated -5 FR2 supply. Each supply uses a full-wave, bridge configuration. The unregulated +30 FR2R supply consists of bridge rectifier CR7 and filter capacitor C9. Its input is fused w ith 0.5A [...]

5700A/5720A Series II Calibrator Service M anual 2-36 ahp005f.eps Figure 2-6. Power Amplifier Output Supply Simplified Schematic[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-37 2-67. ±250V and ±500V Supplies Input signals PA CT, PA HAC1, PA HAC2, PA LAC1, and PA LAC2 come from the main transformer. • PA CT is the center tap. • PA HAC1 and PA HAC2 are high voltage taps with approximately 400V rms and are fused by F201 and F204 respectively. • PA[...]

5700A/5720A Series II Calibrator Service M anual 2-38 Output current on the +PA side is sensed betw een the emitter and base of Q203 by R202 and/or R201. Supply +PA shuts off to near 0V when enough current is flowing through +PA to forward-bias Q203. Then, current though Q203 charges capacitor C209 through R214 to a voltage above the threshold volt[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-39 Table 2-10. Regulated Outputs from the Regulator/Guard Crossing Assembly Signal Name Nominal Output Tolerance Current Limit Rated Output Test Point +15 OSC +15V +/-800 mV 2A 200 mA TP3 -15 OSC -15V +/-800 mV 2A 200 mA TP5 +5RLH +5.975V +/-425 m V 2A 600 mA TP14 +5LH +5.1V +/-300[...]

5700A/5720A Series II Calibrator Service M anual 2-40 The -44S supply uses the unregulated -44SR supply from the Filter assembly. This supply uses three-terminal TO-39 regulator U13, Q1, V R1, VR2, VR 6, R17, R18, R19, PTC Resistor R61, CR22, CR23, CR32, CR33, C22, C25, C26, and C66. The regulator IC, U13, provides the current and thermal limiting.[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-41 supply. Capacitor C12 improves ripple rejection. Diodes CR9 and CR10 protect U5 against input shorts, while CR12 protects against reverse voltage. 2-77. Guarded Digital Cont r ol Circuitr y The Inguard CPU controls all the analog assemblies. It communicates with the Unguarded CP[...]

5700A/5720A Series II Calibrator Service M anual 2-42 2-80. Inguar d Clock Cir cuit This circuit uses 8 MHz crystal Y52 and step-down transformer T51 to generate a low - level (200 mV p-p) 8 MHz clock used by other guarded assemblies throughout the calibrator. Transformer (T51) has a center-tapped secondary, and provides CLK COM, CLK and C LK*. The[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-43 2-85. Int er face to G uar ded Digit al Bus The interface to the guarded digital bus consists of a 74HCT245 (U55), a 74HCT244 (U52), two 74HC137s (U53 and U54), inverters U51B and U51D, resistor packs Z52, Z53, and Z54, and the POP line from U58. U52A and U52B buffer various con[...]

5700A/5720A Series II Calibrator Service M anual 2-44 The Switch Matrix assembly consists of 33 latching type, two- and four-pole relays. The relays are driven by special driver chips, which are controlled by the assembly’ s 24- output 82C55 chip. The Switch Matrix also contains the 5700A-4HR1 Temperature- Controlled Precision DC A mplifier Hybri[...]

2 Theory of Operation 2-45 System Interconnection Detailed Circuit Description Figure 2-7. Switch Matrix Assembly Simplified Schematic ahp37f.eps[...]

5700A/5720A Series II Calibrator Service M anual 2-46 A UCN5801 driver (U13) drives non-latching relays on the motherboard. The motherboard non-latching relay supply circuit, as outlined in sections A6 through A8 of the schematic diagram, contains U17, Q1, Q2, CR1, CR2, CR10, and R6-R12. Port A of U1 provides data for this driver (PA0-PA7), and dec[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-47 ahp006f.eps Figure 2-8. Switch Matrix Configuration for 11V DC and 22V DC Ranges[...]

5700A/5720A Series II Calibrator Service M anual 2-48 2-90. Switch Matr ix O per ation : 2 . 2V AC and 22V AC Ranges Refer to Figure 2-9 for the following discussion. AC 2.2V and 22V ranges are generated by the Oscillator assemblies and routed directly to the front panel binding posts through relays located on the Switch Matrix and Motherboard. Lin[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-49 ahp007f.eps Figure 2-9. Switch Matrix Configuration for 2.2V and 22V AC Ranges[...]

5700A/5720A Series II Calibrator Service M anual 2-50 ahp008f.eps Figure 2-10. Switch Matrix Configuration for 220V DC and AC Ranges[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-51 2-92. Switch Matr ix O per ation : 2 . 2V DC Range Refer to Figure 2-11 for the following discussion. The dc 2.2V range circuit consists of the dc 2.2V attenuator and a dc 2.2V range amplifier as outlined on sheet 3 of the Switch Matrix schematic. This circuit contains a CA3096 [...]

5700A/5720A Series II Calibrator Service M anual 2-52 ahp009f.eps Figure 2-11. Switch Matrix Configuration for 2.2V DC Range[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-53 2-93. Calibration of t he 2 . 2V Range Refer to Figure 2-12 for the following discussion. Calibration of the 2.2V range involves determining its offset and gain constants. To calibrate the offset: 1. The gain of the internal cal zero amplifier is set to 130 by turning on Q6 via [...]

5700A/5720A Series II Calibrator Service M anual 2-54 ahp010f.eps Figure 2-12. Calibration of the 2.2V DC Range[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-55 ahp011f.eps Figure 2-13. Switch Matrix Configuration for 220 mV DC Range[...]

5700A/5720A Series II Calibrator Service M anual 2-56 2-95. Switch Matr ix O per ation : 220 mV AC Range Refer to Figure 2-14 for the following discussion. As previously mentioned, the ac 220 mV range uses the same resistor network as the dc 220 mV range. In generating the ac 220 mV range the Oscillator assembly is set to the 2.2V range. Lines O SC[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-57 ahp012f.eps Figure 2-14. V AC, 2.2 mV AC, and 22 mV AC Range[...]

5700A/5720A Series II Calibrator Service M anual 2-58 ahp013f.eps Figure 2-15. Divider Calibration[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-59 Calibration of the 10:1 divider ratio is accomplished by connecting the DAC assembly output (DAC OUT HI and DAC SENSE HI) through relays K24 (A and B) and K6 to the input of the 10:1 divider. DAC LO, PA COM, and R COM are connected to the common of the 10:1 divider by relays K12[...]

5700A/5720A Series II Calibrator Service M anual 2-60 ahp014f.eps Figure 2-16. Divider Gain Calibration[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-61 The internal cal zero amplifier is outlined in a broken line rectangle on sheet 1 of the schematic. Its functional parts are U20-U21, R38-44, R46-47, Q6-7, Q11, and Z2. When Q7 is on, the input of the zero amplifier is connected to 0V for a reference point. When Q6 is on, the ga[...]

5700A/5720A Series II Calibrator Service M anual 2-62 first input square wave is called the first channel. It is switched between the reference voltage (13V) and 0V. The filter’ s second input square wave is called the second channel. It is switched between approximately 0.78 mV and 0V. Its amplitude is derived by resistively dividing the 13V ref[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-63 ahp015f.eps Figure 2-17. DAC Assembly Simplified Schematic[...]

5700A/5720A Series II Calibrator Service M anual 2-64 2-102. DAC Assembly Digital Cont r ol The digital control circuit is located on sheet 6 of the DAC schematic. The 82C55 Programmable Peripheral Interface IC (U31) is the heart of this circuit. This IC, which is under software control via the guarded digital bus, has three ports that provide 24 s[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-65 The reference circuit is designed such that the effects of the thin-film resistors and op amp errors are second order. Thus, accuracy is determined almost entirely by the ref amps. To further reduce the effects of ambient temperature variations, the hybrid is heated to a constan[...]

5700A/5720A Series II Calibrator Service M anual 2-66 The 3V source is created from the 13V reference. The 13V reference is buffered by op amp U1B, configured as a voltage follower. The output from U1B is divided down to 3V by a 100 k Ω and 30 k Ω resistor in the HR5 assembly, creating 3V. This 3V is again buffered by op amp U11, configured as [...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-67 In the 22V range, Q20 is off and Q21 is on, which switches in the 40 k Ω feedback resistors located on the HR6 assembly. Precise ratio matching of these resistors provides high accuracy in the 22V range. FET Q15 is on in the 22V ra nge so that the output of the dc amplifi er i[...]

5700A/5720A Series II Calibrator Service M anual 2-68 2-109. Negative Offset Circuit This circuit creates a constant offset voltage of approximately -127 mV at the filter input. Thus, for a DAC output voltage of 0V, the first channel count must be approximately 400 to offset this negative voltage. This guarantees a minimum duty cycle pulse width of[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-69 2-112. Calibra tion Hardware The main components of the calibration hardware are the adc amplifier and the adc (analog to digital converter). This adc circuitry converts dc analog voltages into 22-bit binary numbers which the software interprets. 2-113. ADC Amplifier ADC amplifi[...]

5700A/5720A Series II Calibrator Service M anual 2-70 2-115. ADC Cir cuit The adc (analog-to-digital converter) is shown on sheet 5 of the DAC schematic. Most of the adc is contained on one chip (U25) which uses the Fluke-patented recirculating remainder technique. The adc has rms noise of approximately 20 µ V between readings. This is reduced by [...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-71 ahp016f.eps Figure 2-18. ADC Circuit Measurement Functions[...]

5700A/5720A Series II Calibrator Service M anual 2-72 During the remainder store function, U29 amplifies and stores the difference between the ADC INPUT and the adc dac output on one of the remainder storage capacitors, C89 or C90. In this function, U29 is configured by the adc as a difference amplifier with a gain of 16. The output of U29 is now t[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-73 same as the previous checkpoint. This determines the exact first and second channel counts for a 0V output. Next, the +11V and +22V range gain constants are calibrated by nulling the DAC to the external 10V source, connected to the front panel binding posts of the calibrator. Th[...]

5700A/5720A Series II Calibrator Service M anual 2-74 All power supplies used by this assembly are generated by the Gu ard Crossing/Regulator assembly (A17) except the +5 OSC supply, w hich is generated by a three-terminal +5V regulator (U25) from the +15 OSC supply. The ±15 OSC supplies are buffered by L3, L4, C34 and C35 to create the ±15A supp[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-75 2-123. Averaging Converter The averaging converter contains the buffer amplifier and rectifying amplifier circuits as outlined on sheet 1 of the schematic. The buffer amplifier is a non-inverting unity gain amplifier (U3). Input to the buffer amplifier is either a 0 or 20 dB att[...]

5700A/5720A Series II Calibrator Service M anual 2-76 ahp017f.eps Figure 2-19. Oscillator Control Analog Control Loop[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-77 2-127. AC/DC Therm al Tr ansf er Circuit Refer to Figure 2-20 for the following discussion. The ac/dc thermal transfer circuit achieves basic mid-band amplitude accuracy. This is done by first applying the reference voltage (VREF) to the thermal rms sensor (U14) and measuring th[...]

5700A/5720A Series II Calibrator Service M anual 2-78 ahp018f.eps Figure 2-20. AC/DC Thermal Transfer Circuit[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-79 The ac/dc thermal sensor and square-root amplifier, as outlined on the schematic, contain the thermal sensor U14, op amp U15 and transistor array U17. The dc voltage from the thermal sensor is connected to U15B configured as an integrator. Comparator U22B is used to control FETs[...]

5700A/5720A Series II Calibrator Service M anual 2-80 2-129. AC/DC Frequency Response Charact erization Characterization is accomplished by first performing an ac/dc transfer with the Oscillator Output set to a low frequency. The ac/ac thermal sensor circuit, containing the thermal sensor U16 and op amp U15D, characterizes the frequency response of[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-81 ahp019f.eps Figure 2-21. Quadrature RC Oscillator Circuit[...]

5700A/5720A Series II Calibrator Service M anual 2-82 2-131. Oscillator O utput Digit al Cont r ol The digital control circuit consists of an 82C55 Programmable Peripheral Interface (U26), a 5801 Latching Relay Driver (U24), and three HC374 Octal D-Type Flip Flops (U12, U32, U33). The Programmable Peripheral Interface (U 26) is under software contr[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-83 frequency and the sum of the phase shifts around the loop is zero for all frequencies, we have satisfied one half of the requirement for oscillation. In summing the gain in dB around the loop it is apparent that unity gain occurs at only one frequency. This happens when the clos[...]

5700A/5720A Series II Calibrator Service M anual 2-84 that makes a positive to negative transition causes the phase detector to turn on either the positive (CR5, CR 6) or the negative (CR7, CR8 ) charge pump, depending on which signal is first. The Charge Pump is turned off w hen the other signal makes its transition. Thus the signal with the highe[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-85 The mid stage is a common-emitter, Miller-compensated gain stage (Q5) that drives a common-base level shifter (Q13) on the Oscillator Ou tput assembly. This stage is current limit protected by R12 and Q4. The dominant pole is set w ith the Miller capacitor C5 and the input stage[...]

5700A/5720A Series II Calibrator Service M anual 2-86 2-140. Power Amplif ier Digit al Control Sip Assem bly ( A16A1) Digital control for the Power Amplifier assembly is contained on the SIP assembly (A16A1) mounted at the bottom of the Power A m plifier. This assembly configures the Power Amplifier assembly for its various modes of operation. (Als[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-87 2-141. PA Common Cir cuit r y Common circuitry consists of the +PA and -PA supplies, input stage, mid stage, and the output stage. These four circuits are described under the next four headings. Power Amplifier input node, gain, and feedback are different for dc and ac operation[...]

5700A/5720A Series II Calibrator Service M anual 2-88 the gate of Q2 is at ground potential. At any frequency, the potential difference between the gate of Q2 and the base of Q6 results in a current through Q 6 as determined by R22, and by the transconductance of Q2 and Q6. The input stage is called a transconductance stage because an input voltage[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-89 2-146. PA Sense Current Cancellat ion Cir cuit ry During dc operation of the Power Amplifier, sense current in the 500 k Ω feedback resistor (on the resistor network in the HR8 assembly) can cause an output error because of the finite resistance path of the connection to the l[...]

5700A/5720A Series II Calibrator Service M anual 2-90 ahp020f.eps Figure 2-22. Power Amplifier Simplified Schematic[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-91 2-149. PA Operat ion: 220V AC Range During ac operation, Power Amplifier gain is -10 as determined by the 4.99 k Ω input resistor R17, and 49.9 k Ω feedback resistors (R11 + R12 + R13). Control line SW3 turns Q50 on, which references the +input of the precision op amp in the[...]

5700A/5720A Series II Calibrator Service M anual 2-92 is configured the same as for 220V ac operation, except that the input is the square-wave signal HVCL from the H igh Voltage Control assembly, rather than OSC OUT HI, through relays K13B and K10A. 2-153. 220V DC Inter nal Calibration Networ k The 220V dc internal calibration network determines t[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-93 ahp021f.eps Figure 2-23. Power Amplifier DC Calibration Network[...]

5700A/5720A Series II Calibrator Service M anual 2-94 Power Amplifier dc gain of approximately -20 is calibrated next. The Power Amplifier is configured as in the 220V dc operation, except the input is connected to the DAC’ s 6.5V reference BRF6 and BSRF6 by U2C and U2D respectively. The resulting -130V at the Power Amplifier output is connected [...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-95 f2-24.eps Figure 2-24. Power Amplifier Calibration AC Attenuator[...]

5700A/5720A Series II Calibrator Service M anual 2-96 2-155. High Voltage Assembl ies (A14 and A15) The High Voltage/High C urrent assembly (A15) and the High Voltage C ontrol assembly (A14) are used in with conjunction with other assemblies in the calibrator to generate the ±1100V dc, 1100V ac, and the 2.2A ranges. The tw o assemblies work togeth[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-97 ahp022f.eps Figure 2-25. High Voltage/High Current Assembly 1100V AC Range[...]

5700A/5720A Series II Calibrator Service M anual 2-98 2-157. 1100V DC Range Refer to Figure 2-26 for the following discussion. The High Voltage assembly (A 15) amplifies the output of the DAC assembly (A 11), set to the 11V range, by a gain of -100 to generate the 1100V dc range. For operation in the 1100V dc range, DAC OUT HI and DAC SENSE HI from[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-99 ahp023f.eps Figure 2-26. High Voltage/High Current Assembly 1100V DC Range[...]

5700A/5720A Series II Calibrator Service M anual 2-100 When the DAC assembly is set to the +11V range, the output from the High Voltage assembly (with a gain of -100) is in the -1100V range. In this mode, -SP C is connected to the collector of transistor Q3. The output from the dc HV amplifier follows a change in the output voltage from the DAC ass[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-101 ahp024f.eps Figure 2-27. High Voltage/High Current Assembly 2.2A AC and DC Ranges[...]

5700A/5720A Series II Calibrator Service M anual 2-102 Resistor network Z5 and hybrid H4 determine the performance of the 2.2A range. Current from the A7 assembly develops a voltage across the 57W portion of Z5. The 2.2A current amplifier circuit forces the same voltage across the 0.57W portion of Z5. Because the ratio of these resistors is 100, th[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-103 VI+ supplies the output current when sourcing while VI- sinks it. To minimize power dissipation, the magnitude of the VI± supplies is controlled to minimize the emitter to collector voltage on the output stage transistors (Q11, Q14). This is done by controlling the magnitude o[...]

5700A/5720A Series II Calibrator Service M anual 2-104 2-164. High Voltage Calibrat ion Refer to Figure 2-28 for the following discussion. The resistor network, (70 k Ω and 7 M Ω ) which is part of the HR7 hybrid/resistor netw ork assembly, determines the accuracy of both 1100V ac and dc ranges. Calibration involves determining its offset and g[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-105 ahp025f.eps Figure 2-28. High Voltage/High Current Assembly Calibration[...]

5700A/5720A Series II Calibrator Service M anual 2-106 2-166. Calibration of t he Cur r ent Function. Refer to Figure 2-29 for the following discussion. The resistor network Z5 determines the accuracy of the 2.2A current range. Calibration involves determining its offset and gain constants. The Calibrator is configured as in the 2.2A dc function, e[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-107 ahp026f.eps Figure 2-29. High Voltage/High Current Assembly 2.2A Range Calibration[...]

5700A/5720A Series II Calibrator Service M anual 2-108 The signal/ polarit y selecti on circuit generates the ERROR SIGNAL used by th e error amplifier. It contains op amp U2C, CMOS analog switch U6, and resistor R35-R39. Control line V/I controls U6B and U6C which select the VI± when in the current mode. Control lines ±* and ± control U6A and U[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-109 These assemblies are also used to calibrate the Calibrator Current function. The Ohms Main assembly contains all the resistor values except the 1 Ω , 1.9 Ω , and short, which are located on the Ohms Cal assembly. It also contains the relays and their drivers to switch these[...]

5700/5720A Series II Calibrator Service Manual Figure 2-30. Ohms Assemblies Simplified Schematic ahp38f.eps 2-110[...]

2 Theory of Operation Analog Selection Detailed Circuit Description ahp39f.eps 2-111 Figure 2-31. Ohms Main Assembly Simplified Schematic[...]

5700A/5720A Series II Calibrator Service M anual 2-112 2-171. Ohms M ain Assem bly Suppor t of Current Funct ion Calibr at ion To calibrate the current function, the Current assembly routes output current to the Ohms Main assembly, where it is connected through a resistance. Current is determined by measuring the voltage across this resistance. Dur[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-113 Lines PC0-PC3 of port C go to decoder U13 and to the O hms Main assembly. Decoder U13 enables two latch/driver ICs at a time. S etting the enable true (0V) causes the relay coils to be driven on or off depending on the contents of the latch portion of the selected ICs. Since th[...]

5700A/5720A Series II Calibrator Service M anual 2-114 ahp027f.eps Figure 2-32. Two-Wire Lead Drop Compensation Circuit[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-115 2-177. Two-Wire Compensat ion Power Supplies The floating supplies for U7 and U8 consist of a dc-to-dc converter made up of U6, T1 and associated components. Switching-regulator control IC U6 sw itches +17S through the primary of T1 at about 30 kHz as determined by R27 and C21.[...]

5700A/5720A Series II Calibrator Service M anual 2-116 ahp028f.eps Figure 2-33. Calibration to an External 10 k Ω Standard[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-117 2-181. Calibrating to the Ext ernal 10 KW Standard Refer to Figure 2-33 for the following discussion. The first step in ohms calibration is to compare the 10 k Ω standard against the 10 k Ω value on the Ohms C al assembly. This is done by passing a current through both valu[...]

5700A/5720A Series II Calibrator Service M anual 2-118 OHMS SENSE HI is connected to INT SENSE HI by K16 and K2 on the Ohms Main assembly. INT SENSE HI is connected to the SENSE H I binding post by relay K2 on the motherboard which is the sense high side of the 10 k Ω external standard. The ratio of this third reading to the difference of the fir[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-119 The 10 Ω , 19 Ω , 100 Ω and 190 Ω resistance values are determined using 2V from the 2/5/10V source and using internal 10:1 divider (Z5) in conjunction with the DAC. To get 2V, Q2 and Q3 are both turned on, which parallels both the 11.535 k Ω value and the 3.846 k Ω[...]

5700A/5720A Series II Calibrator Service M anual 2-120 ahp029f.eps Figure 2-34. Ratio Calibration, 10 Ω From 100 Ω[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-121 2-185. Calibrating to the Ext ernal 1W Standard The 1 Ω and 1.9 Ω resistor values are calibrated by comparing them against a 1 Ω external standard. The technique used is different from that used for the 10 k Ω external standard. The Current assembly supplies a 130 mA (6[...]

5700A/5720A Series II Calibrator Service M anual 2-122 Relay driver U11 controls the three non-latching relays K14, K15, and K17 on this assembly. It also generates control line RLY11* to control K11 on the Motherboard. Relay K11 routes I- GUARD, described later, t o the rear panel for operation when the rear-panel binding posts are in use. The dia[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-123 ahp030f.eps Figure 2-35. Current Output Simplified Schematic[...]

5700A/5720A Series II Calibrator Service M anual 2-124 The input signal return pat hs are selected for ac or dc operation by control li nes FET1 and FET2, and NMOSFETs Q20-Q23. With a dc or 13V reference input, cont rol line FET1 goes high, turning on Q21 and Q22, connect ing RCOM and DAC OUT LO to the respective circuit. For ac current i nput, con[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-125 Table 2-15. Relay Settings for Current Range Selection Relay Range 220 µ A 2.2 mA 22 mA 220 mA K5 R S S S K6 RSR R K7 RSR R K8 RRS R K9 R R R S S=SET R=RESET 2-192. Feedback Loop The output current develops a 2.2V full-scale voltage across the appropriate shunt resistors. Buff[...]

5700A/5720A Series II Calibrator Service M anual 2-126 Internal calibration of the 2.2A range and gain of the High Voltage/High Current assembly is discussed further in the theory for the High Voltage assemblies. 2-195. Current G uar d Buf f er Buffer amplifier U4, configured as a voltage follower, is used to provide a guard voltage equal to the ou[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-127 ahp031f.eps Figure 2-36. Current Assembly Calibration[...]

5700A/5720A Series II Calibrator Service M anual 2-128 amplifier is connected to RCL, w hich is routed to the adc circuit on the DAC assembly. The adc circuit measures the voltage, which is the drop across the 100 Ω resistor with no current applied through it. This value is the checkpoint reading and is stored in memory. The output of the Current[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-129 990 Hz and five digits resolution from 1000.0 Hz to 1.1999 kHz. The resolution break points are similar for the other ranges. 2-200. Reference Frequency Am p/ Divider A 2-MHz reference frequency is generated by the reference frequency amp/divider circuit as outlined on the sche[...]

5700A/5720A Series II Calibrator Service M anual 2-130 Supply voltage is applied to vco U19 whenever the Hi-Res function is used by the circuitry containing analog CMOS switch U18A, transistor Q15, and zener diode VR3. VCO U 19 is energized when control line HI-RES O N/OFF goes low to close U18A, which turns on transistor Q15, connecting zener diod[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-131 2-205. Rear Panel Power Supplies Power supplies are divided into guarded and unguarded. Unguarded supplies +5V LOGIC, +12V, and -12V are referenced to +5V LOGIC COMMON and are generated on the Digital Power Supply assembly (A19). Guarded supplies +5LH and -5LH are referenced to[...]

5700A/5720A Series II Calibrator Service M anual 2-132 2-207. Clock Regeneration Cir cuit In order to minimize EMI (electro-magnetic interference) inside the Calibrator chassis, the rear panel accepts a low-level (~200 mV p-p sinewave) 3.68 MH z clock from the CPU assembly and conditions it to proper TTL clock levels. This is done by a differential[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-133 5220EN* is the output enable for octal latch U10. 5220ADIR* is the output enable for buffer U11. 5205EN* is the output enable for octal latch U9. 2-210. Auxiliary Amplif ier Int er f ace A 5725A amplifier can be physically connected to the 5700A/5720A Series II. Only one can be[...]

5700A/5720A Series II Calibrator Service M anual 2-134 Oscillator Output assembly theory of operation for a detailed description on the generation of P SHIFT. Resistor R18 serves as overcurrent protection for the BNC shell connection on J5. 2-213. Rear Panel Relay Contr ol The relays on the Rear Panel assembly are used as the interfaces for the 572[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-135 • Seven control lines w hich comprise the C ONTROL B US • A low-lev e l 3.6864 MHz clock (CLOCK, CLOCK*) • Eight data lines RPD0-RPD7 Interfacing between the Rear Panel data bus (D100-D107) and the CPU data bus (RPD0- RPD7) is done with a bus transceiver U 1. 2-215. Wideb[...]

5700A/5720A Series II Calibrator Service M anual 2-136 In this c ircuit, WB MUXA, WB MUXB, and WB MUXC are dec oded by U8 to generat e four control lines, These are inverted and level-shifted by comparators in U10 and U11. The output of these comparators create 16-32 MHz FILTER, 8-16 MHz FILTER, 4-8 MHz FILTER, 2-4 MHz FILTER, 1-2 MHz FI LTER, and [...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-137 The vco frequency is controlled by varactor diodes, CR1 + CR2, which get their bias voltage from amplifier U2. Amplifier U2, w hich gets its input from the phase detector outputs (0V and 0R) of U1, changes the bias on varactor diodes C R1 and CR2 until the divided vco frequency[...]

5700A/5720A Series II Calibrator Service M anual 2-138 and C112. FET Q105 is turned on, in the sam e manner as FET Q101, to connect the si ne wave output of this filter to FILTER OU TPUT. This is applied to output driver transistor Q7. To obtain the required amount of filtering over the entire octave range, additional capacitors C110 and C111 are s[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-139 ahp032f.eps Figure 2-37. Wideband Output Assembly Simplified Schematic[...]

5700A/5720A Series II Calibrator Service M anual 2-140 2. The second range is for operation at frequencies between 12 kHz and 1.1 MHz. In this mode the input signal is also from the Oscillator Output assembly, but the amplitude is controlled by the amplitude control circuit on the Wideband Output assembly. Relay K10 is in the set position to connec[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-141 2-224. Wideband Output At t enuators The 10 Hz to 30 MHz sine wave signal output of the power amplifier circuit connects to the 50 Ω output attenuator composed of attenuator networks Z1 and Z2 and relays K4, K5, K6, K7, and K8. Relay K4 switches the 10 dB attenuator into the [...]

5700A/5720A Series II Calibrator Service M anual 2-142 sensor from damage by shunting its input and output to ground through the 200 Ω resistors R2 and R18. The negative voltage at the output of U4A also turns off transistor Q 1 and causes control line U9 ENABLE to go high. This disables relay driver U9, which turns off all attenuator relays (K4-[...]

Theory of Operation Analog Section Detailed Circuit Description 2 2-143 connector is connect ed back to the OUTPUT HI SENSE and OUTPUT LO SENSE binding posts. Attenuation is calibrated starting with 70 dB and decreased in 10 dB steps to 0 dB. The Switch Matrix assembly connects the output of the Wideband AC module to its internal cal zero amplifier[...]

5700A/5720A Series II Calibrator Service M anual 2-144[...]

3-1 Chapter 3 Calibration and Verification Title Page 3-1. Introduction .......................................................................................... 3-3 3-2. Accessing the Fuse ............................................................................... 3-4 3-3. Cleaning the Air Filter...............................................[...]

5700A/5720A Series II Calibrator Service M anual 3-2 3-30. Wideband Flatness Calibration Procedure ....................................... 3-41 3-31. Optional Tests ...................................................................................... 3-42 3-32. DC Voltage Load Regulation Test ................................................... 3-4[...]

Calibration and Verification Introduction 3 3-3 3-1. Introduction This chapter gives procedures for 5700A/5720A Series II calibration, verification, acceptance testing, and performance testing. Information here applies to testing the performance of and calibrating a normally operating 5700A/5720A Series II. In case of malfunction, refer to Chapter [...]

5700A/5720A Series II Calibrator Service M anual 3-4 3-2. Accessing the Fuse The fuse is accessible from the rear panel. The fuse rating label to the right of the fuse holder shows the correct replacement fuse ratings for each operating voltage. To access the fuse, refer to Figure 3-1 and proceed as follows: 1. Disconnect line power. 2. Using a sta[...]

Calibration and Verification Cleaning the Air Filter 3 3-5 3-3. Cleaning the Air Filter Caution Damage caused by overheating may occur if t he area around the fan is restri ct ed, t he i ntake air is too w arm, or t he ai r f i l ter becomes clogged. The air filter must be removed and cleaned at least every 30 days, or more frequently if the calibr[...]

5700A/5720A Series II Calibrator Service M anual 3-6 3-4. Cleaning the Exterior To keep the calibrator looking like new, clean the case, front panel keys, and lens using a soft cloth slightly dampened with either water or a non-abrasive mild cleaning solution that is not harmful to plastics. Caution Do not use aromatic hydrocarbons or chl ori nated[...]

Calibration and Verification Calibrating the 5700A/5720A Series II to External Standards 3 3-7 3-7. Calibration Requirements Both the calibrator and the recommended external standards have the ability to internally control (or compensate for) ambient temperature variations. Therefore it is unnecessary to keep the calibrator in tightly controlled te[...]

5700A/5720A Series II Calibrator Service M anual 3-8 3-9. Calibration Procedure Before you being this procedure make sure the calibrator is powered on and has completed the appropriate warm-up period. After you have finished calibration, but before you save the new constants, the calibrator presents the new changes as ± ppm, and as a percentage of[...]

Calibration and Verification Calibrating the 5700A/5720A Series II to External Standards 3 3-9 4. Enter the ambient temperature; then press E . The display shows: PREV MENU IF3-4.EPS 5. Connect the 732B to the calibrator as shown in Figure 3-3. 732B DC STANDARD AC PWR IN CAL CHARGE LOW BAT 10V 1.018V CHASSIS GUARD 1.018V COM 10V COM SERIAL NUMBER H[...]

5700A/5720A Series II Calibrator Service M anual 3-10 6. Enter the true value of the 732B 10V output. The true value is the value printed on the calibration sticker, plus or minus, as well as drift that has occurred since calibration. That drift can be estimated provided control charts have been maintained for the 732B. If the entered value is not [...]

Calibration and Verification Calibrating the 5700A/5720A Series II to External Standards 3 3-11 8. Reverse the HI and LO connections at the 732B terminals, and press E . The following displays appear, asking you to wait before proceeding with the 10 k Ω standard. PREV MENU IF3-8.EPS After a few seconds, the following display appears: PREV MENU IF[...]

5700A/5720A Series II Calibrator Service M anual 3-12 RESISTANCE STANDARD HI LO HI LO SENSE CURRENT HI HI LO LO HI OUTPUT V A SENSE V AUX CURRENT GUARD GROUND WIDEBAND CHASSIS GROUND Ω Ω CALIBRATOR F7-4.EPS Figure 3-4. 742A-1 and 742A-10k External Calibration Connections 10. To reject the changes, return to the calibration menu shown in step 2 [...]

Calibration and Verification Calibrating the 5700A/5720A Series II to External Standards 3 3-13 11. Disconnect the 10 k Ω standard, and connect the calibrator to the 1 Ω standard; then enter the true value of the 1 Ω standard. If the standard is not between 0.9 Ω and 1.1 Ω , an error message appears, which lets you start over from this po[...]

5700A/5720A Series II Calibrator Service M anual 3-14 3-10. Range Calibration Once calibration is complete, you may find you need to make further adjustments to the range. Calibrating the range is accomplished by adjusting a range constant, which is an additional gain multiplier. Although range calibration is not needed in order to meet total uncer[...]

Calibration and Verification Range Calibration 3 3-15 PREV MENU IF3-2.EPS 3. Press the “Range Adjust” softkey to bring up the next menu shown below : PREV MENU IF3-18.EPS 4. Press the “DC V” softkey to bring up the next menu shown below : PREV MENU IF3-19.EPS 5. Press the “NEXT Menu” softkey, wh ich scrolls through all the available dc [...]

5700A/5720A Series II Calibrator Service M anual 3-16 PREV MENU IF057.E PS 8. Press O to activate the calibrator output. Then turn the output adjustment knob on the calibrator until you achieve a null on the null detector. 9. Se the rear panel CALIBRA TION switch to EN ABLE. Press E on the front panel. The calibrator will now calculate a new range [...]

Calibration and Verification Calibrating the Wideband AC Module (Option 5700A- 03) 3 3-17 OUTPUT V A SENSE VA AUX CURRENT GUARD GROUND WIDEBAND NC HI HI HI LO LO LO OUTPUT HI LO GND GRD 752A VOLTAGE DIVIDER STANDARD INPUT REFERENCE STANDARD NULL DETECTOR HI LO GUARD GND NULL DETECTOR HI LO HI HI LO 732B VOLTAGE REFERENCE STANDARD EX SNS : OFF EX GR[...]

5700A/5720A Series II Calibrator Service M anual 3-18 Since frequency flatness is determined by stable parameters (i.e. circuit geometry and dielectric constants), the flatness of the Wideband AC Module has excellent long-term stability. Consequently, a two-year calibration cycle is adequate for flatness calibration, and can be scheduled to coincid[...]

Calibration and Verification Calibrating the Wideband AC Module (Option 5700A- 03) 3 3-19 HI HI LO LO HI OUTPUT V A SENSE V AUX CURRENT GUARD GROUND WIDEBAND Ω GND TAB 50 FEEDTHROUGH Ω Ω CALIBRATOR F7-5.EPS Figure 3-6. Wideband Module Calibration Connection 4. Press the “Gain” softkey to bring up the following display: PREV MENU IF3-3.EPS[...]

5700A/5720A Series II Calibrator Service M anual 3-20 6. Reverse the dual-banana connector so that the center connector is connected to LO; then press E . The display shows the following: PREV MENU IF3-16.EPS After a short time, a message appears indicating that the wideband calibration is complete. 7. To store the new constants, set the CALIBRATIO[...]

Calibration and Verification Performing a Calibration Check 3 3-21 PREV MENU IF3-3.EPS 3. Enter the ambient temperature; then press E . As the calibration check proceeds, the display indicates the current process of the calibration check. When the check is complete, the largest shift that is detected appears on the display. PREV MENU IF3-17.EPS 4. [...]

5700A/5720A Series II Calibrator Service M anual 3-22 3-13. Full Verification An independent external verification is recommended every two years, following normal periodic calibration or repair of the calibrator. Verification establishes and maintains parallel external traceability paths for the internal functions that are not adjusted or correcte[...]

Calibration and Verification Full Verification 3 3-23 In Figure 3-7, the location of each test is identified by the paragraph numbers. 3-14. Required Equipment for All Tests An abbreviated summary of required equipment for all the verification and optional tests is given in Table 3-2. Individual lists of required equipment are included at the begin[...]

5700A/5720A Series II Calibrator Service M anual 3-24 Table 3-2. List of Required Equipment for Main Output Equipment Description Application AC Measurem ent Standard or Fluke 5790A AC V, ACI Resistanc e Standards Fluke 742A Series Cal, Ohm s, DCI Reference Div ider Fluke 752A DC V Null Detector EM Electronic s N11 (Fluke 845A) DC V Shunt Adapter F[...]

Calibration and Verification Full Verification 3 3-25 3-16. Resistance Verificat ion Test The following test requires testing at the high, low and intermediate values only. This is because the 5700A/5720A Series II creates the other values of resistance from these values. Use Tables 3-16 (5720A) and 3-17 (5700A) for test records. For the convenienc[...]

5700A/5720A Series II Calibrator Service M anual 3-26 INPUT SENSE HI LO HI LO DMM OUTPUT SENSE HI LO HI LO CALIBRATOR (UUT) CURRENT SENSE HI LO HI LO OUTPUT HI LO CURRENT SOURCE 742A-X F3-5.EPS Figure 3-8. 1 Ohm and 10 Ohm Resistor Verification Not e There is no need to do the cal current calculation of step 6 if the current source has a settabilit[...]

Calibration and Verification Full Verification 3 3-27 Table 3-4. Low Value Resistance Calibration Using a Current Source 5720A (UUT) Resistance Apply Current 5720A Deviation From Displayed Value (90-day) 5720A Displayed Value 1 Ω 100 mA ± 95 ppm 0.9995 to 1.0005 1.9 Ω 100 mA ± 95 ppm 1.89905 to 1.90095 10 Ω 10 mA ± 25.0 ppm 9.997 to 10.003[...]

5700A/5720A Series II Calibrator Service M anual 3-28 3-18. DC Voltage Verificat ion Test The following test checks every dc voltage range by testing the output accuracy at decade values of voltage from 100 mV to 1000V. Use Table 3-18 (5720A ) or Table 3-19 (5700) for the test record. Table 3-5 lists equipment required for this test as well as the [...]

Calibration and Verification Full Verification 3 3-29 3-19. DC Voltage One-Tent h Scale Linearity Test Note If the result of the previous test at 1V on the 11V range was less than 2.5 µ V it is not necessary to perform this test. This test uses the same equipment as the previous test. Proceed as follows to perform the DC Voltage O ne-Tenth Scale L[...]

5700A/5720A Series II Calibrator Service M anual 3-30 3-20. Direct Current A ccuracy Verification Test Equipment required for the Direct Current Accuracy Verification Test is listed in Table 3-6. Proceed as follows to test accuracy of the dc current function: Table 3-6. Equipment Required for Direct Current Test Equipment Model DC DMM , 6-1/2 digit[...]

Calibration and Verification Full Verification 3 3-31 5. Algebraically add column B to column A. E nter the result on the test record. Verify that it is within the test limits shown. 6. Repeat steps 2 through 5 using the Fluke 742A Resistance Standards and Calibrator output currents shown in Tables 3-25 or 3-26. 7. If the Calibrator is attached to [...]

5700A/5720A Series II Calibrator Service M anual 3-32 Use Table 3-23 (5720A) or Table 3-24 (5700A) for the test records. 1. Place the 5790A on top of the Calibrator and connect the equipment as shown in Figure 3-11. Not e The point of measurement is at the end of the cable and adapter that connects to the 5790A. Other cable lengths and adapters wil[...]

Calibration and Verification Full Verification 3 3-33 Table 3-8. 5790A Adjustment Counts 5700A/5720A Series II Output Level 5790A Display 5790A Adjustment Counts* 2 mV 2.0000 ± 1 20 mV 20.0000 ± 1 200 mV 200.0000 ± 4 2V 2.000000 ± 4 2.3V 2.30000 ± 1 20V 20.00000 ± 4 200V 200.0000 ± 4 300V 300.000 ± 1 600V 600.000 ± 2 1000V 1000.000 ± 2 *A[...]

5700A/5720A Series II Calibrator Service M anual 3-34 1. Connect the equipment as shown in Figure 3-12(A) use the 2A shunt. 2. Enter the ac to dc difference corrections for each shunt at each frequency in the appropriate column of the test record (Table 3-26 or 3-27). 3. Set the Calibrator for a +2A dc output. Adjust the output so that the error di[...]

Calibration and Verification Full Verification 3 3-35 Note When verifying the 5725A Amplifier at the 10A level, allow sufficient time for the A40A-10 shunt to reach thermal stability after initially applying the current. A. Alternating Current Test Setup, 22 mA to 2A Using 5790A Input 1 Hi 5790A Input 1 Pomona Cable 1368-A-18 Lo Red Black 792A-7004[...]

5700A/5720A Series II Calibrator Service M anual 3-36 3-24. AC Current Test , 2 mA and 200 µ A Ranges The equipment required for the alternating current accuracy verification test for the 2 mA and 200 µ A ranges is listed in Table 3-10. Use Table 3-28 (5720A) or 3-29 (5700A0 for the test record. Table 3-10. Equipment Required for Alternating Curr[...]

Calibration and Verification Full Verification 3 3-37 9. Change the Calibrator frequency to 20 Hz, 40 Hz, 1 kH z, 5 kHz and 10 kHz. At each frequency record the error display on the 5790A in Table 3-28 or 3-29. Verify that the results are within limits shown. 10. Repeat steps 2 through 9, but replace the 200 Ω metal film resistor with the 2 k Ω[...]

5700A/5720A Series II Calibrator Service M anual 3-38 Note The input impedance at INPUT 2 of the 5790A on the m illivolt ranges is 10 M Ω shunted by 83 pF and the cable used to connect the shunt resistor to the 5790A has 40 pF capacitance, for a total of 123 pF. The reactance of 123 pF at 10 kHz is 129 k Ω , and using formula (1), in the case w[...]

Calibration and Verification Wideband Output Accuracy at 1 kHz Test 3 3-39 Table 3-11. Equipment Required for Testing and Calibrating the Wideband Option Equipment Model or Description AC Measurem ent Standard Fluke 5790A with Wideband Option -03 Wideband cable Supplied w ith 5700A-03 50 Ω Termination Supplied with 5700A-03 Adapter Pomona 1269 BN[...]

5700A/5720A Series II Calibrator Service M anual 3-40 Table 3-12. Wideband Adjustment Tolerance 5700A/5720A Series II Wideband Output 5790A Adjustment Counts ± ppm 2.10000V 20 1.00000V 10 300.000 mV 3 100.000 mV 10 30.0000 mV 3 10.0000 mV 1 3.00000 mV 1 1000.00 µ V1 3-29. Wideband Output Flatness Test Use Table 3-32 as a test record. To perform w[...]

Calibration and Verification Wideband Output Flatness Test 3 3-41 3-30. Wideband Flatness Calibration Procedure This procedure is the only part of full verification that stores calibration constants in the Calibrator. This is not a verification test, it is a calibration procedure. Because this part of calibration is recommended to be done only ever[...]

5700A/5720A Series II Calibrator Service M anual 3-42 21. Push the CLEAR REF WBND soft key on the 5790A. The 5790A wideband output changes to 10 mV at 1 kHz. 22. Push the SET REF soft key on the 5790A when the 5790A settles to a reading. This is the 10 mV reference value from which all other frequencies w ill be compared. 23. Repeat steps 7 and 8 a[...]

Calibration and Verification Optional Tests 3 3-43 3. Repeat load regulation testing at the remaining Calibrator outputs shown in Table 3-47. 4. Set the Calibrator to standby and disconnect all equipment from the Calibrator. 3-33. DC Voltage Linearity Test Use Table 3-35 for a test record. Proceed as follows to test the dc voltage linearity: 1. Sel[...]

5700A/5720A Series II Calibrator Service M anual 3-44 LO OUTPUT SENSE HI CALIBRATOR (UUT) GRD GND SHIELDED TWISTED PAIR OUTPUT COAX TRUE RMS VOLTMETER VERTICAL OSCILLOSCOPE MAINFRAME* 7A22 PLUG-IN CLIP LEADS 3' APPROX GR BANANA PLUGS SHIELDED TWISTED PAIR CABLE DETAIL BNC OSCILLOSCOPE AND AC DIFFERENTIAL VOLTMETER SHOULD BE ISOLATED FROM THE P[...]

Calibration and Verification Optional Tests 3 3-45 3-35. DC Voltage Output Noise ( 0 . 1 to 10 Hz ) Test Proceed as follows to test for dc voltage output noise in the range 0.1 to 10 Hz: 1. Place the 8520A DMM into Math Program 8 with the D i splay Option Register set to register 8.3 (Standard Deviation Computed Variable)as follows: a. Press SHIFT,[...]

5700A/5720A Series II Calibrator Service M anual 3-46 Note If the spectrum analyzer input impedance is 50 Ω , do not use a separate termination. 2. With 0 dBm output programmed from the Calibrator wideband output, select frequencies over the band of 1 MHz to 30 MHz and verify that use the spectrum analyzer to verify that any harmonics are below -[...]

Calibration and Verification Minimum Use Requirements 3 3-47 Table 3-15. Minimum Use Requirements Item No. Description M inimum Use Specifications Recommended Equipment Calibration Equipment 1. Voltage Reference 10V nominal, true value c e rtified to within ± 1.5 ppm Fluke 732B 2. Resistance Standards 1 Ω nominal, true value certified to within [...]

5700A/5720A Series II Calibrator Service M anual 3-48 Table 3-15. Minimum Use Requirements (cont) Item No. Description M inimum Use Specifications Recommended Equipment 9. Current Shunt Adapter Used in c onjunction with 5790A and A40- series s hunts to facilitate AC Current measurem ents Fluke 792A-7004 10. Frequency Counter 10 Hz to 30 M Hz ± 0.0[...]

Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 3-49 Example 1 shows you how to calculate a specification limit for a specific test level from a specification listed as a percentage (or parts per million) of reading plus a floor error in microvolts, millivolts, miroamps, or nanoamps. The 99% confidence specifi[...]

Table 3-16. 5720A Resistance Test Record 1 Ω Std Res Value 1 Ω Std Voltage Measured 1 Ω Std Voltage Cal Current UUT 1 Ω Displayed Value UUT 1 Ω Voltage UUT True Res UUT Dev. Uncert Std Spec ( ± ppm) TUR GB Factor Test Limit ( ± ppm) Max Difference of Charactized to Nominal Value 5.9 95 16.06 1.000 95 0.9995 to 1.0005 1.9 Ω Std Res Val[...]

3-51 Table 3-16. 5720A Resistance Test Record (cont) Std Res Value DMM Std Res Rdg DMM Error DMM UUT Res Value UUT True Res Value UUT Dev. Uncert Std Spec (ppm) TUR GB Factor Test Limit ( ± ppm) Max Difference of Characterized to Nominal Value 1.9 M Ω (1) 19 1.89962M to 1.90038M 10 M Ω ) 12.0 37 3.07 0.982 36.3 9.997M to 10.003M 19 M Ω 21.9 [...]

Table 3-17. 5700A Resistance Test Record 1 Ω Std Res Value 1 Ω Std Voltage Measured 1 Ω Std Voltage Cal Current UUT 1 Ω Displayed Value UUT 1 Ω Voltage UUT True Res UUT Dev. Uncert Std Spec (ppm) TUR GB Factor Test Limit (ppm) Max Difference of Characterized to Nominal Value 5.9 95 16.06 1.000 95 0.9995 to 1.0005 1.9 Ω Std Res Value 1.9[...]

Table 3-17. 5700A Resistance Test Record (cont) Std Res Value DMM Std Res Rdg DMM Error DMM UUT Res Value UUT True Res Value UUT Dev. Uncert. std Spec ( ± ppm) TUR GB Factor Test Limit ( ± ppm) Max Difference of Characterized to Nominal Value 1.9 M Ω (1) ± 19 1.89962M to 1.90038M 10 M Ω 12.0 ± 37 3.07 0.982 36.3 9.997M to 10.003M 19 M Ω )[...]

5700A/5720A Series II Calibrator Service M anual 3-54 Table 3-18. DC Voltage Test Record for 5720A Divider Setting 5720A Range 5720A Output (1) Null Detector Reading( µ V) (2) Null Det Limit ( µ V) Meter Limit Rattle ( µ V) 0.1V 0.22V 0.1V ± 1.20 (2) NA 1V 2.2V 1V ± 4.8 µ V (2) 0.55 1V 11V 1V (3) ± 6 (2) 2.2 10V 11V 10V (4) ± 33 3.5 10V 22V[...]

Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 3-55 Table 3-19. DC Voltage Test Record for 5700A Divider Setting 5700A Range 5700A Output (1) Null Detector Reading( µ V) (2) Null Det Limit ( µ V) Meter Limit Rattle ( µ V) 0.1V 0.22V 0.1V ± 1.45 (2) NA 1V 2.2V 1V ± 7.2 (2) 0.55 1V 11V 1V (3) ± 9 (2) 2.2 [...]

5700A/5720A Series II Calibrator Service M anual 3-56 Table 3-20. Direct Current A ccuracy Test Record (5720A) Characterizing dc DMM @ ± 200 mV and ± 2.0V Output Current Std Res Value DC DMM Setting Rdg. Column A Std Res Correction (ppm) Column B UUT Error Reading (ppm) UUT Actual Error (A+B) (ppm) Test Limit, 90-day ( ± ppm) +2A 0.1 Ω (200 mV[...]

Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 3-57 Table 3-21. Direct Current A ccuracy Test Record (5700A) Characterizing dc DMM @ ± 200 mV and ± 2.0V Output Current Std Res Value DC DMM Setting Rdg Column A Std Res Correction (ppm) Column B UUT Error Reading (ppm) UUT Actual Error (A+B) (ppm) Test Limit,[...]

5700A/5720A Series II Calibrator Service M anual 3-58 Table 3-23. 5720A AC Voltage Output Test R ecord Output Level Frequency Error Display Reading Spec ( ± ppm ) 5790A 1-Year Spec ( ± ppm) TUR GB Factor Test Limit (4) ( ± ppm) 90-Day Test Record 2 mV 1 kHz 2590 1070 2.42 0.958 2480 2 mV 20 kHz 2590 1070 2.42 0958 2480 2 mV 50 kHz 2730 1810 1.51[...]

Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 3-59 Table 3-23. 5720A AC Voltage Test Record (cont) Output Level Frequency Error Display Reading Spec ( ± ppm ) 5790A 1-Year Spec ( ± ppm) TUR GB Factor Test Limit (4) ( ± ppm) 200V 1 kHz 64 31 2.05 0.936 59 200V 20 kHz 64 31 2.05 0.936 59 200V 50 kHz 101 69 [...]

5700A/5720A Series II Calibrator Service M anual 3-60 Table 3-24. 5700A AC Voltage Output Test R ecord Output Level Frequency Error Display Reading Spec ( ± ppm ) 5790A 1-Year Spec ( ± ppm) TUR GB Factor Test Limit (4) ( ± ppm) 90-Day Test Record 2 mV 1 kHz 2610 1070 2.44 0.958 2500 2 mV 20 kHz 2610 1070 2.44 0.958 2500 2 mV 50 kHz 2870 1810 1.5[...]

Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 3-61 Table 3-24. 5700A AC Voltage Output Test Record (cont) Output Level Frequency Error Display Reading Spec ( ± ppm ) 5790A 1-Year Spec ( ± ppm) TUR GB Factor Test Limit (4) ( ± ppm) 200V 1 kHz 85 31 2.74 0.971 83 200V 20 kHz 85 31 2.74 0.971 83 200V 50 kHz [...]

5700A/5720A Series II Calibrator Service M anual 3-62 Table 3-26. 5720A AC Curr ent 20 mA to 10A Accuracy Test Record 2A, 200 mA, 20 mA and 10A Test Recor d Output Current Freq A40 Shunt AC-DC Diff UUT Error Display Calculated Error Spec ± ppm 2A 40 Hz 320 2A 1 kHz 320 2A 5 kHz 510 2A 10 kHz 7100 200 mA 10 Hz 305 200 mA 20 Hz 200 200 mA 40 Hz 145 [...]

Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 3-63 Table 3-27. 5700A AC Curr ent 20 mA to 10A Accuracy Test Record 2A, 200 mA, 20 mA and 10A Test Recor d (10A Only for 5725A) Output Current Freq A40 Shunt AC-DC Diff UUT Error Display Calculated Error Specs ± ppm 2A 40 Hz 670 2A 1 kHz 670 2A 5 kHz 800 2A 10 [...]

5700A/5720A Series II Calibrator Service M anual 3-64 Table 3-28. 5720A AC Curr ent 2 mA and 200 µ A Accuracy Test Record Output Current Frequency Error Spec. ± ppm (90-day) 5790A Transfer Spec ± ppm TUR GB Factor Test Limits ± ppm 2 mA 10 Hz 305 210 1.45 0.874 267 2 mA 20 Hz 200 73 2.74 0.971 194 2 mA 40 Hz 150 27 5.56 1.000 150 2 mA 1 kHz 150[...]

Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 3-65 Table 3-30. Wideband Frequency Accuracy Test Record Frequency ( Hz ) Frequency Measured Tolerance Limits 10 Hz 99.99 ms to 100.01 m s 100 Hz 9.999 ms to 10.001 m s 300 Hz 299.97 Hz to 300.03 Hz 500 Hz 499.95 Hz to 500.05 Hz 800 Hz 799.92 Hz to 800.08 Hz 900 [...]

5700A/5720A Series II Calibrator Service M anual 3-66 Table 3-31. Wideband Accuracy at 1 kHz Test R ecord Output Level Measured Error Spec ± ppm (90-day) 5790A 1-Year Spec ± ppm TUR GB Factor Test Limit 2.1V 2238 24 93 1.000 2238 1.0V 2900 24 121 1.000 2900 0.3V 2833 38 74.5 1.000 2833 0.1V 3400 53 64.1 1.000 3400 30 mV 3333 115 29.0 1.000 3333 1[...]

Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 3-67 Table 3-32. Wideband Flatness Test Record (cont) Output Level Frequency Measured Flatness Error Spec ± ppm (90-day) 5790A 1-Year Spec TUR GB Factor Test Limit ± ppm 30 mV 10 kHz 1000 500 2.00 0.932 932 120 kHz 1000 500 2.00 0.932 932 500 kHz 1100 500 2.20 [...]

5700A/5720A Series II Calibrator Service M anual 3-68 Table 3-33. Wideband Absolute Error 10 Hz to 500 kHz Output Level Frequency 1 kHz Absolute Error ppm Flatness Error ppm Error Sum ppm 90-Day Spec Limit ( ± ppm) 2.1V 10 Hz 5238 30 Hz 2238 10 kHz 2238 120 kHz 2238 500 kHz 2238 1V 10 kHz 2900 120 kHz 2900 500 kHz 2900 300 mV 10 kHz 2833 120 kHz 2[...]

Calibration and Verification Determining Test Limits for Other Calibration Intervals 3 3-69 Table 3-34. Load Regulation Test Record Div. Setting 5700A/5720A Series II Range 5700A/5720A Series II Out/Full Load Change In Null Measured Change In Null Limit 10V 11V 10V/199 Ω± 3.1 µ V 100V 220V 100V/1999 Ω± 42 µ V 1000V 1100V 1000V/49.99 k Ω±[...]

5700A/5720A Series II Calibrator Service M anual 3-70 Table 3-37. AC V Distortion Test Summary 5700A/5720A Series II Output Load Resistors Frequency Measur ed Distortion Max. Distortion 2V 100 Ω , 1/8W 10 Hz, 20 Hz 0.054% 1 kHz , 20 kHz, 50 k Hz, 0.044% 100 kHz , 200 kHz, 500 k Hz 0.355% 20V 1 k Ω , 1/2W 10 Hz, 20 Hz 0.0535% 20 kHz , 100 kHz 0.[...]

Some semiconductors and custom IC's can be damaged by electrostatic discharge during handling. This notice explains how you can minimize the chances of destroying such devices by: 1. Knowing that there is a problem. 2. Leaning the guidelines for handling them. 3. Using the procedures, packaging, and bench techniques that are recommended. The f[...]

5. USE STATIC SHIELDING CONTAINERS FOR HANDLING AND TRANSPORT. 6. DO NOT SLIDE S.S. DEVICES OVER ANY SURFACE. 7. AVOID PLASTIC,VINYL AND STYROFOAM  IN WORK AREA. 8. WHEN REMOVING PLUG-IN ASSEMBLIES HANDLE ONLY BY NON-CONDUCTIVE EDGES AND NEVER TOUCH OPEN EDGE CONNECTOR EXCEPT AT STATIC-FREE WORK STATION. PLACING SHORTING STRIPS ON EDGE CONNECTOR[...]

4-1 Chapter 4 Maintenance Title Page 4-1. Introduction .......................................................................................... 4-3 4-2. Cleaning the Air Filter.......................................................................... 4-3 4-3. General Cleaning .......................................................................[...]

5700A/5720A Series II Calibrator Service M anual 4-2[...]

Maintenance Introduction 4 4-3 4-1 . Introduct ion This section covers procedures that do not fall into the category of troubleshooting or repair. This includes access procedures, installation of the Wideband module (Option - 03), periodic cleaning, and other special service procedures. 4-2. Cleanin g the Air F ilter CAUTION Damage caused by overhe[...]

5700A/5720A Series II Calibrator Service M anual 4-4 4-3. General Clean ing To keep the Calibrator looking like new, clean the case, front panel keys, and lens using a soft cloth slightly dampened with water or a non-abrasive mild cleaning solution that does not harm plastics. CAUTION Do not use aromatic hydrocarbons or chl ori nated solvents f or [...]

Maintenance Access Procedures 4 4-5 REMOVE Figure 4-2. Rear Panel Removal 4-10. Rear Panel Assembly Access Refer to Figure 4-3 during the following procedure: REMOVE REMOVE 1 REMOVE FACK SCREWS TO SEPARATE THE REAR PANEL CIRCUIT BOARD FROM THE METAL HOUSING. 1 1 1 1 F4-3.EPS Figure 4-3. Rear Panel Assembly Access 1. Remove the six securing screws f[...]

5700A/5720A Series II Calibrator Service M anual 4-6 5. Remove P11 from J11. Then remove the two paddle board mounting screws and separate the paddle board from the Rear Panel assembly. 6. Remove the jack screws for each connection on the rear panel housing, then gently lift the Rear Panel assembly out from the housing. 7. Reverse this procedure to[...]

Maintenance Access Procedures 4 4-7 4-13. Keyboard Assembly Removal and Inst allat ion The following procedure assumes that the Display Assembly Removal procedure has already been completed. 1. Remove all output cabl e connections ( including GROUND- to-meta l) from the front panel binding posts. Save all removed hardware. 2. Remove the two hex scr[...]

5700A/5720A Series II Calibrator Service M anual 4-8 VOLTAGE SELECT SWITCHES RS232 A5 WIDEBAND OUTPUT PCA A6 WIDEBAND OSCILLATOR PCA A7 CURRENT/HIGH-RESOLUTION OSCILLATOR PCA A1 KEYBOARD ASSEMBLY A8 SWITCH MATRIX PCA A2 FRONT PANEL PCA A9 OHMS CAL PCA A10 OHMS MAIN PCA A11 DAC PCA A12 OSCILLATOR CONTROL PCA A13 OSCILLATOR OUTPUT PCA A14 HIGH VOLTAG[...]

Maintenance Front/Rear Binding Post Reconfiguration 4 4-9 4-15. Digital Assembl y Removal and Install ation Remove the CPU Assembly or the Digital Power Supply Assembly by pulling straight up at the top corners of the assembly. In relation to the chassis side, the CPU A ssembly components face toward, and the Digital Power Supply A ssembly componen[...]

5700A/5720A Series II Calibrator Service M anual 4-10 Reverse this procedure when changing from rear to front output operation. 1. Remove instrument top and bottom covers and remove bottom analog guard cover. 2. Remove the instrument front panel by removing the three hex screws on each front handle side and a single screw on the top of the front pa[...]

Maintenance Installing a Wideband AC Module (Option -03) 4 4-11 4-1 9 . Insta lling a Wideba nd AC Module (Option - 0 3) CAUTION The Wideband option ci rcui t board assemblies cont ai n static- sensitive component s. Use caution to avoi d st at i c discharge when handling t he modul es. The procedure that follows can be used to install a 5700A-03 W[...]

5700A/5720A Series II Calibrator Service M anual 4-12 2. Follow the access procedures to remove the digital side cover. 3. Remove the CPU Assembly (A20). 4. Desolder and remove battery BT1. 5. Solder a replacement battery in place (refer to the parts list for replacement information if necessary.) 6. Replace the CPU Assembly. After replacing the ba[...]

Maintenance Using Remote Commands Reserved for Servicing 4 4-13 FATALITY? Description: Returns the list of the fatal faults logged since the list was last cleared by the FATALCLR command. (Sequential command.) Parameter: None Response: (String) The list of faults, one per line in the following format: <date> <time> <fault code> &l[...]

5700A/5720A Series II Calibrator Service M anual 4-14[...]

5-1 Chapter 5 Troubleshooting Title Page 5-1. Introduction .......................................................................................... 5-3 5-2. Interpreting Diagnostic Fault Codes..................................................... 5-3 5-3. Component- level Troubleshooting ....................................................... 5-40[...]

5700A/5720A Series II Calibrator Service M anual 5-2[...]

Troubleshooting Introduction 5 5-3 5-1. Introduction Information in this section begins with guidance in using self-diagnostics fault codes to isolate a faulty module. The descriptive text helps to quickly locate the source of a fault. Further on, under Component Level Troubleshooting, techniques for isolating faulty components or circuits are desc[...]

5700A/5720A Series II Calibrator Service M anual 5-4 2704 Spare This fault code is not used. 2705 A7: Oven Regulation Fault The heater voltage of the current hybrid is measured by dividing OVEN TEMP dow n and connecting it to the SDL line where it is measured by the adc circuit on the D AC assembly to ensure the hybrid is warmed up and regulating. [...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-5 2713 A7: Hi-Res Loop In 100Hz Range The instrument is set for 2.0V at 100 Hz operation. The input voltage to the VCO circuit is resistively divided to create the control line HI-RES LOO P. HI-RES LO OP is connected to the SDL line where it is measured by the adc circuit on the the D AC assem[...]

5700A/5720A Series II Calibrator Service M anual 5-6 2801 A11: 8255 Port a W ires The diagnostics software writes and reads data to port A of the 8255 IC on the DAC assembly. A failure indicates the DAC assembly (A11) is probably at fault. 2802 A11: 8255 Port B Data Bus The diagnostics software reads port B of the 8255 IC on the DAC assembly. A fai[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-7 2808 A11: ADC Amp Gain Error The DAC is set to 0.1V on the 11V range and connected to the +input of the DACs adc amplifier circuit and the -input is connected to common. The adc amplifier has a nominal gain of 11 resulting in 1.1V at the adc amplifier output. This gain is checked to be 11 ±[...]

5700A/5720A Series II Calibrator Service M anual 5-8 2815 A11: 6.5V Ref erence Fault The DAC’ s 6.5V reference (REF6) is connected to the -input of the adc circuit and the DAC output (DAC SENSE CAL) is connected to the +input. The 6.5V reference is measure by adjusting the DAC until a null is achieved. This fault occurs if the 6.5V reference is o[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-9 2822 A8/A11: - 11/22V DC Zero Estimate Fault The DAC is in either the -11V or -22V range. Its output (DAC SENSE CAL) is connected to the +input of the adc circuit and the -input is connected to RCOM. The zero is estimated by adjusting the DAC until a null is achieved. T his fault occurs when[...]

5700A/5720A Series II Calibrator Service M anual 5-10 3103 A14: 8255 Port C Fault The diagnostics software reads port C of the 8255 IC on the High Voltage Control assembly. A failure indicates the High Voltage C ontrol assembly (A14) is probably at fault. 3104 A15: HV Oven Regulation Fault The heater voltage of the High Voltage/High Current assembl[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-11 3109 A15: HV +D C Preamplifier Fault The instrument is set to the dc 1100V range with the amplitude set to 220V, 600V , and 1100V. The output of the DC HV AMPLIFIER/ AC SENSE BUFFER circuit of the Hi gh Voltage/High Current assembly is measured for 0.55V ±0.2V. This voltage is divided to c[...]

5700A/5720A Series II Calibrator Service M anual 5-12 line for measurement by the adc circuit on the DAC assembly. This failure occurs if the expected output voltage is not within 12% of the nominal. 3116 A15: HV -D C Reference/error Amp Fault The instrument is set to the dc 1100V range with the amplitude set to -220V, -600V , and -1100V. The contr[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-13 3122 A14/A15: HV AC 1kHz, Preamp (Lo) The instrument is configured to the ac 1100V range with on amplitude of 220V at 1 kH z. The output of t he DC HV AMPLIFIER/AC SENSE BUFFER circui t of the High Voltage/High Current assembly is measured for 0.0V ±0.2V. This voltage is divided to create [...]

5700A/5720A Series II Calibrator Service M anual 5-14 3128 A14/A15: HV AC 1kHz, Output (Lo) The instrument is configured to the ac 1100V range with on amplitude of 220V at 1 kH z. The high voltage output is divided and converted to a dc voltage by the OUTPUT PEAK MEASUR E circuit to create MUX5. This dc voltage is equal to the positive peaks of the[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-15 3134 Spare This fault code is not used. 3135 Assembly A14 Not Responding At power up the instrument checks to see what assemblies are not installed. This test verifies that the High Voltage Control assembly is not responding. A failure indicates the High Voltage Control assembly is probably[...]

5700A/5720A Series II Calibrator Service M anual 5-16 3140 A14/A15/A16: 2.2A AC Range Ab s. Value The instrument is configured to the ac 2.2A range and set for an output current of 0.22A at 1 kHz, 0.6A at 1 kHz, 1.1A at 1 kHz, 0.6A at 40 Hz, and 1.1A at 50 Hz. The output current from the High Voltage/High C urrent assembly is routed to the Current [...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-17 3303 A9: 8255 Port C Fault The diagnostics software reads port C of the 8255 IC on the Ohms Cal assembly (A 9) during the instruments dormant state. A failure indicates the Ohms Cal assembly (A 9) is probably at fault. 3304 A9: 10V Source Fault The 2/5/10V SOUR CE circuit on the Ohms C al a[...]

5700A/5720A Series II Calibrator Service M anual 5-18 10 mV. A failure indicates the D ifferential Amplifier circuit on the Ohms Cal assembly (A9) is probably at fault. 3309 A9: Diff Amp Gain Fault The gain (nominal gain of 75) Differential Amplifier circuits on the Ohms C al assembly (A) is checked. The DAC output is set to 86.7 mV and connected t[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-19 3315 A9/A10: 10 Ohm Cal Diag Fault The 2/5/10V SOURCE circuit is set for 2V and connected across the 100 Ω string on the Ohms Main assembly. The resulting 0.2 V across the 10 Ω portion is connected to the - input of the Differential Amplifier on the Ohms Cal assembly. The output of the [...]

5700A/5720A Series II Calibrator Service M anual 5-20 3321 A9/A10: 10M Ohm Rat io Fault The 2/5/10V SOUR CE circuit on the Ohms C al assembly is set to 10V which is routed to the Ohms Main assembly and connected to the 10 M Ω string. The resulting 1V across the 1 M Ω portion is measured for 1V ±3% ±15 mV. A failure indicated the O hms Main as[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-21 3327 A9/A10: 1 Kilohm C heck Fault The Current assembly (A7) outputs 1.3 mA wh ich is routed to the Ohms Main assembly (A10), via INT OUT HI, where it is connected to the 1 k Ω string. The voltage drop across the 1 k Ω string is measured for 1.3V ±3% ±15 mV. A failure indicates the Oh[...]

5700A/5720A Series II Calibrator Service M anual 5-22 3334 A9/A10: 1.9 Ohm Ch eck Fault The Current assembly (A7) outputs 13 mA wh ich is routed through the Ohms Main assembly (A10), via INT OU T HI, to the Ohms Cal assembly (A9) where it is connected to the 1.9 Ω resistance. The voltage drop across the 1.9 Ω resistance is measured for 24.7 mV [...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-23 assembly. The resulting 0.2V across the 10 k Ω portion of Z5 is connected to the +input of the differential amplifier. The output of the differential amplifier is routed to the adc circuit on the DAC assembly, via the R CL line, and measured for 0V ±3% ±15 mV. A failure indicates the ca[...]

5700A/5720A Series II Calibrator Service M anual 5-24 3406 A13: 8255 Port B The diagnostics software reads port B of the 8255 IC on the O scillator Output assembly during the instruments dormant state. A failure indicates the Oscillator Ou tput assembly (A13) is probably at fault. 3407 A13: 8255 Port C The diagnostics software reads port C of the 8[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-25 within ± 100 mV. A failure indicates the O scillator Control assembly (A12) is probably at fault. 3414 A12/A13: Nonlinear Control Loop 2vrng The instrument is set for 1V 1 kHz operation. Signal ERROR INT. OUT on the Oscillator Control assembly is measured via the SDL line to be 0V ±5.0V. [...]

5700A/5720A Series II Calibrator Service M anual 5-26 measured via the RCL line. The output of this ac/ac sensor is measured by comparing it to the DAC assembly output voltage. The difference is measured to be 0V ±100 mV. A failure indicates the Oscillator Control assembly (A12) is probably at fault. 3422 A12: AC Cal Sensor (20V Range) The instrum[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-27 3503 A16: 8255 Port C The diagnostics software read port C of the 8255 IC on the Power Amp assembly. A failure indicates the Power Amp assembly (A16) is probably at fault. 3504 Spare This fault code is not used. 3505 Spare This fault code is not used. 3506 Spare This fault code is not used.[...]

5700A/5720A Series II Calibrator Service M anual 5-28 resulting in a -130V Power Amplifier output. The second is the normal 220V dc operation with the input voltage from the DAC assembly. In this mode the Power Amplifier is outputting 22.1V, 100V, 219V, and -219V . In each mode the Power Amplifier output voltage is measured to be the nominal ±10% [...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-29 hybrid is warmed up and regulating. The heater voltage is measured to be 0.7V ±10% ±0.2V. A failure indicates the Power A m plifier assembly (A16) is probably at fault. 3521 Assembly A16 Is Not Responding At power up the instrument checks to see what assemblies are not installed. This tes[...]

5700A/5720A Series II Calibrator Service M anual 5-30 input of t he 220V RANGE AC ATTENUATOR circuit whi ch has a nominal gai n of -.01. The resulting +1.3V at its output is measured to be within 10% by connecting it to the RCL line and routing it to the +input of the adc circuit on the DAC assembly. The D AC output is connected to the -input and a[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-31 Crossing assembly (A17) is faulty. If the voltage is within tolerance, the diagnostic circuit on the Oscillator Output assembly (A 13) is faulty. 3605 -42S Supply Fault The instrument is dormant and the -44 S supply is out of tolerance. Measure the unregulated -44 S voltage on the Filter/PA[...]

5700A/5720A Series II Calibrator Service M anual 5-32 Note All of the following connections and measurements are done on the Filter/PA Supply assembly (A18) in order to verify operation of the +PA supply. Connect DMM COM to TP203 and the high to TP201. Using a jumper, connect TP207 to TP203 and power on the instrument. The DMM should read +180V ±1[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-33 3615 S Com Ground Fault The Current/Hi Res assembly (A7) connects SCOM to the SD L line where it is measured by the adc circuit on the DAC assembly for 0V ±50 mV relative to RCO M. 3700 A21: 8255 Control W ord The diagnostics software reads the control word of the 8255 IC on the Rear Panel[...]

5700A/5720A Series II Calibrator Service M anual 5-34 3801 A8: 8255 Port A Fault The diagnostics software writes and reads to port A of the 8255 IC on the Switch Matrix assembly. A failure indicates the Switch Matrix assembly (A8) is probably at fault. 3802 A8: 8255 Port B Fault The diagnostics software reads port B of the 8255 IC on the Switch Mat[...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-35 3808 A8: Zero Amp Hi Of fset The Internal Cal Zero Amplifier circuit on the Switch Matrix assembly is tested for excessive offset in the high gain configuration. This is done by connecting the circuit input to RCOM, by turning on Q7, and connecting the output to the RCL line where it is mea[...]

5700A/5720A Series II Calibrator Service M anual 5-36 3822 Spare This fault code is not used. 3823 Spare This fault code is not used. 3824 A8: Oven Regulation Fault The heater voltage of the Switch Matrix HR1 hybrid assembly is measured to ensure it is warmed up and regulating by connecting OVEN TEMP to the SDL line where it is measured by the adc [...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-37 3905 A6: Phase Lock Loop At 10MHz The Wideband assemblies are configured to 3.5V at 1.3 MHz, 1.2V at 1.3 MH z, 2.0V at 3.0 MHz, 1.0V at 4.1 MHz, 3.3V at 5.0 MHz, 2.0V at 6.0 MHz, 2.0V at 7.0 MHz, and 2.0V at 7.9 MHz. The input voltage to the VC O circuit on the Wideband Oscillator assembly [...]

5700A/5720A Series II Calibrator Service M anual 5-38 level it is checked for 0.0V ±0.7V. A failure indicates the Wideband Output (A5) assembly is probably at fault. 3911 A5/A6: Ampl. Cont rol At 30MHz The Wideband assemblies are configured for a 3.5V and 1.2V output at 30.0 MHz. WB AMPLITU DE CON TROL w hich it the control signal to the Wideband [...]

Troubleshooting Interpreting Diagnostic Fault Codes 5 5-39 3916 A5: 20DB Output A ttenuation Fault The 6.5V reference (BRF6, BSRF6) is connected to the Unity Gain Amplifier circuit on the Wideband Output assembly which drives the output through the A ttenuators. The Wideband Output assembly is set for 20 dB attenuation so the 6.5V input results in [...]

5700A/5720A Series II Calibrator Service M anual 5-40 3923 A5: 8255 W as Reset The control word of the 8255 on the Wideband Output is read. A failure indicates the Wideband Output (A5) assembly is probably at fault. 5-3. Component-level Troubl eshooting Warning Servicing described i n thi s sect i on i s to be performed byqualifi ed servi ce person[...]

Troubleshooting Component-level Troubleshooting 5 5-41 voltage at TP2 and verify it is 0.317 times the voltage at TP1 ±10%. If a failure is detected, check U5 and associated components. Not e During Wideband operation, internal software monitors the output and makes corrections or trips the instrument to standby. This internal monitoring can cause[...]

5700A/5720A Series II Calibrator Service M anual 5-42 voltages of 3V, 1V, 300 mV, and 30 mV, all at 1 kHz, and verify the DMM read the selected voltage ±5%. If a failure is detected, check K4-K8, Z1, and Z2. Next, connect the supplied output cable and 50 Ω ter minator to t he WIDEBAND connector of the Calibrator front panel. Refer to the 5700A/5[...]

Troubleshooting Component-level Troubleshooting 5 5-43 logic high by measuring U15 pin 5. If the signal is incorrect, the control line WB ON/OFF* from the Wideband O utput (A5) assembly is probably at fault. If the control line is correct check U15A and associated components. Note The input CLK and CLK* is a low-level (400 mV p-p) signal generated [...]

5700A/5720A Series II Calibrator Service M anual 5-44 frequency counter to TP3 and adjust the external dc reference until the frequency counter reads 64 MHz ±0.1%. Using the frequency counter, measure the frequency at TP4 and verify it reads 32 MHz ±0.1%. If a failure is detected, check U4 and associated components. Next, measure the frequency at[...]

Troubleshooting Component-level Troubleshooting 5 5-45 1 V 10 ms F5-4.EPS Figure 5-4. Waveform at Pins 14 and 15 of U1 Not e Power down the Calibrator, remove the external dc reference, and replace shorting header E6 on the J6 pins before continuing. 10. Check the Multiplexer U6 and its control lines. Po wer up the Calibrator and it to 1V at 1.2 MH[...]

5700A/5720A Series II Calibrator Service M anual 5-46 switches to a high(~+17V) level wh ile all the others remain at a low (-11V) level. If a failure is detected, check U8, U10, U11, and U13. 14. Check the Filters. Disconnect the cable between the Wideband O scillator assembly and Wideband Output assembly at J1 on the Wideband Output assembly. Set[...]

Troubleshooting Component-level Troubleshooting 5 5-47 5-6. Troubleshooting the Current/Hi-Res Assembly (A7) The Current/Hi-Res assembly generates output current and contains the high-resolution oscillator onto which the Oscillator Control assembly phase locks. S ince these two functions are independent except for their digital control, troubleshoo[...]

5700A/5720A Series II Calibrator Service M anual 5-48 1 V 10 ms F5-6.EPS Figure 5-6. Waveform at Pin 11 of K2 4. Check the 220 µ A range of the 220 µ A/2.2 mA AMP circuit. Set the Calibrator to 200 µ A, standby. Set the external ac reference to 6.4V(±0.1V) at 1 kHz. Using a DMM, measure the ac voltage at the collector of Q4 and verify it is 2.0[...]

Troubleshooting Component-level Troubleshooting 5 5-49 1 V 10 ms F5-7.EPS Figure 5-7. Waveform at Pin 6 of K2 10 k HR2 SHUNT 1.2 R14 2V ac ±10% K5C, K5D, K10, K13 SCOM Ω Ω F5-8.EPS Figure 5-8. Verifying the 220 µ A Range of the 220 µ A/2.2 mA Amp Circuit 5. Check the 2.2 mA Range of the 220 µ A/2.2 mA AMP. Set the Calibrator to 2 mA, standb[...]

5700A/5720A Series II Calibrator Service M anual 5-50 10 k HR2 SHUNT 1.2 R14 2V ac ±10% K7C, K5D, K10, K13 SCOM Ω Ω F5-9.EPS Figure 5-9. Verifying the 2.2 mA Range of the 220 µ A /2.2 mA Amp Circuit 10 k HR2 SHUNT 1.2 R14 2V ac ±10% K8C, K7A, K5, K10, K13 SCOM Ω Ω F5-10.EPS Figure 5-10. Verifying the 22 mA Range of the 22 mA/220 mA Amp C[...]

Troubleshooting Component-level Troubleshooting 5 5-51 10 k HR2 SHUNT 1.2 R14 2V ac ±10% K9C, K8C, K7A, K5D, K10, K13 SCOM Ω Ω F5-11.EPS Figure 5-11. Verifying the 220 mA Range of the 22 mA/220 mA Amp Circuit 9. Check the POS. FB BUFFER. Set the Cali brator to 200 mA, standby. Set the external ac reference to 4.6V at 1 kHz. Using a D MM measur[...]

5700A/5720A Series II Calibrator Service M anual 5-52 5-8. Hi-Res Oscillator Section Proceed as follows to troubleshoot the Hi-Res O scillator Section of the Current/Hi-Res assembly (A7): 1. Remove the four small shields (two on each side) and place the Cu rrent/Hi-Res assembly on the analog reverse extender card. Power up the Calibrator. Not e All[...]

Troubleshooting Component-level Troubleshooting 5 5-53 5. Check VCO Supply Voltage. Set the Calibrator to 2V at 1 kHz, operate. Using a DMM measure the voltage at U19 pin 8 and verify it is -5.25V±7%. If a failure is detected, check U18A, Q15, V R3, and associated components. 6. Check the VCO circuit. Power down the Calibrator, cut jumper E2 and c[...]

5700A/5720A Series II Calibrator Service M anual 5-54 1 V 10 ms F5-14.EPS Figure 5-14. Waveform at TP13 8. Check the LOOP FILTER circui t. Power down the Calibr ator, cut jumper E2 and connect an external variable dc reference (2 to 12V) to TP11(common to TP18). Power up the Calibrator and set it for 2V at 1 kHz. Connect a frequency counter to TP13[...]

Troubleshooting Component-level Troubleshooting 5 5-55 These relays are latched in the set or reset position and remain in that position even after power has been removed. To troubleshoot the signal path through the Switch Matrix assembly simply set the Calibrator to the function in which a problem is detected and then turn off the Calibrator. Now [...]

5700A/5720A Series II Calibrator Service M anual 5-56 Note This 2V can be as much as ±0.12V if the DAC assembly is uncalibrated. If a failure is detected, check the HR1 hybrid, U19, Q4, and associated components. 6. Check the mV Dividers. Set the Calibrator to 200 mV at 1 kHz, operate. Using a DMM measure the ac voltage at the cathode of CR6 (comm[...]

Troubleshooting Component-level Troubleshooting 5 5-57 less than 4 µ V. If a failure is detected check U 7, U8, and associated components. Using a DMM measure the dc voltage across the 500 Ω resistor in Z2 by connecting the DMM HI to TP18 and the DMM LO to TP17. Note this voltage which should be around 5.0V. Next, measure the voltage across the [...]

5700A/5720A Series II Calibrator Service M anual 5-58 Note The connection from the test points to the resistance values is through latching type relays for all resistances except 10M, 19M, and 100 M Ω values. These relays are put in the set or reset position and remain in that position even after power has been removed. To troubleshoot the path t[...]

Troubleshooting Component-level Troubleshooting 5 5-59 1 V 10 ms F5-17.EPS Figure 5-17. Waveform at TP6 1 V 10 ms F5-18.EPS Figure 5-18. Waveform at TP4, Calibrator Set to 0V[...]

5700A/5720A Series II Calibrator Service M anual 5-60 1 V 10 ms F5-19.EPS Figure 5-19. Waveform at TP4, Calibrator Set to 6.5V 5. Check CH2 FILTER IN PUT. Connect an oscilloscope probe to TP7 (common to TP3). Set the Calibrator to 6.5V dc, operate. Set the oscilloscope to 2V/div at 2 ms/div. Verify the oscilloscope displays pulses similar to those [...]

Troubleshooting Component-level Troubleshooting 5 5-61 1 V 10 ms F5-20.EPS Figure 5-20. Waveform at TP7 Not e The duty cycle may differ from this figure. U sing the Calibrator edit knob, vary the second LSD of the Calibrator output display and verify that the duty cycle of the signal at TP7 changes. If either of these displayed signals are incorrec[...]

5700A/5720A Series II Calibrator Service M anual 5-62 1 V 10 ms F5-21.EPS Figure 5-21. Waveform at TP5 9. Check the FILTER INPUT. Set the Calibrator to 6.5V dc, operate. Measure the voltage with a DMM at TP1 (common to TP3 on the main board) on the DAC Filter SIP assembly (A11A1). It should be a nominal +6.5V dc(±0.1V for an uncalibrated instrumen[...]

Troubleshooting Component-level Troubleshooting 5 5-63 14. Check the DAC 20V Range. Set the Calibrator to 20V dc, operate. Using a DMM measure the DAC output voltage at TP8 (common to TP3). It should be a nominal 20V dc (±0.5V for an uncalibrated instrument). If a failure is detected, check Q14, Q15, Q18, Q19, Q 20, Q21, and their associated compo[...]

5700A/5720A Series II Calibrator Service M anual 5-64 approximately a 50% duty cycle. Connect the oscilloscope to pin 6 of U14 and verify it to be the compliment signal. If either signal is incorrect, U14 is probably at fault. 1 V 10 ms F5-22.EPS Figure 5-22. Waveform at Pin 10 of U6 9. Check CH1 SHUNT. Connect an oscilloscope to TP6 (common to TP3[...]

Troubleshooting Component-level Troubleshooting 5 5-65 1 V 10 ms F5-23.EPS Figure 5-23. Waveform at Pin 6 of U13 1 V 10 ms F5-24.EPS Figure 5-24. Waveform at Pin 4 of U10[...]

5700A/5720A Series II Calibrator Service M anual 5-66 1 V 10 ms F5-25.EPS Figure 5-25. Waveform at TP6 10. Check CH1 S ERIES B. Connect an oscilloscope to TP4 (common to TP3).S et the Calibrator to 6.5V dc, operate, and the oscilloscope to 10V/div at 2 ms/div. The oscilloscope should display a signal similar to previously shown Figure 5-19. If a fa[...]

Troubleshooting Component-level Troubleshooting 5 5-67 1 V 10 ms F5-26.EPS Figure 5-26. Waveform at Pin 7 of U12 5-15. ADC Circuit Proceed as follows to troubleshoot the ADC circuit: 1. Check the ADC INPUT select circuit. Set the Calibrator to 10V dc, operate. Verify that the voltage at U23 pin 7 (common to TP12) is 0.45V±7%. If this voltage is in[...]

5700A/5720A Series II Calibrator Service M anual 5-68 8. Check the ADC +6.4V Reference. Verify that the voltage at U27 pin 1(common to TP12) is 6.4±0.2V. If this voltage is incorrect, check U27B and associated components. 9. Check the ADC SAMPLE/HOLD +BOOTSTRAP supply. Set the Calibrato r to standby. Verify that the voltage at U29 pin 7 (common to[...]

Troubleshooting Component-level Troubleshooting 5 5-69 5-17. Troubleshooting the Oscillator Control Assembly (A12) The first part of this troubleshooting procedure (steps 1 through 7) checks the averaging converter. The second part (steps 8 through 10) checks the AC/DC transfer circuit. Note During normal operation of the Calibrator, internal softw[...]

5700A/5720A Series II Calibrator Service M anual 5-70 1 V 10 ms F5-27.EPS Figure 5-27. Waveform at Anode of CR4 1 V 10 ms F5-28.EPS Figure 5-28. Waveform at Pin 6 of U11 8. Check the DC SENSE BUFFER and the AC SENSE BUFFER. Set t he Calibrat or to 1.0V at 1 kHz, operate. Connect an oscilloscope to TP6 (common to TP2) w hich is[...]

Troubleshooting Component-level Troubleshooting 5 5-71 the input to the AC/DC sensor. The oscilloscope display should be switching between Figure 5-29, which is t he output of the DC SENSE BUFFER circuit and Figure 5-30, which is t he output of the AC SENSE BUFFER circuit . If either of these signals is incorrect, check the appropriate SENSE BUFFER[...]

5700A/5720A Series II Calibrator Service M anual 5-72 1 V 10 ms F5-30.EPS Figure 5-30. AC Sense Buffer Waveform at TP6 5-18. Troubleshooting the Oscillator Output Assembly (A13) Note During normal Calibrator operation, internal software monitors the output and makes corrections or trips the instrument to standby. This internal monitoring can cause [...]

Troubleshooting Component-level Troubleshooting 5 5-73 4. Next, jumper the input of the SUMMING AMPLIFIER to the -5S supply and check the following: • TP5: positiv e voltag e • TP4: neg ative v oltage • TP3: positiv e voltag e • Pin 6 of U8: positive voltage 5. Repair any amplifier circuits which are not properly inverting. Reinstall feedba[...]

5700A/5720A Series II Calibrator Service M anual 5-74 11. Check the Phase Lock circuit. Connect a frequency counter to the Calibrator output. Set the Calibrator to 2V at 1 kHz, operate, and check the frequency accuracy to be within 0.01% of the nominal. If the frequency is out of tolerance, proceed as follows: a. Check the ZERO C ROSSING D ETECTORS[...]

Troubleshooting Component-level Troubleshooting 5 5-75 1 V 10 ms F5-31.EPS Figure 5-31. Waveform at TP3 3. Check the High Voltage Control in the 1100V ac range. Set the Calibrator to 220V at 110 Hz and 130 Hz, operate. At both output frequencies measure with a D MM the ac voltage at pin 1A or 1C of connector P611 and verify it reads 220±0.2V. In t[...]

5700A/5720A Series II Calibrator Service M anual 5-76 CR4, and associated components. If the measure voltage is much greater than 227V skip to the Magnitude Control Circuit troubleshooting starting at step 10. 7. Check HV O UT from the High Voltage Control assembly. Set the Calibrator to +220V dc, operate. Using a DMM measure the dc voltage at pin [...]

Troubleshooting Component-level Troubleshooting 5 5-77 power up there is still no signal at TP3 during pow er up then check U3, U7C/D, and associated components in the Square Wave Amplifier circuit. 4. Check the Absolute Value Circuit. Add a jumper connecting the front panel OUTPUT HI binding post to the OUTPUT LO binding post. Set the Calibrator t[...]

5700A/5720A Series II Calibrator Service M anual 5-78 operation refer to Figure 2-25 in the Theory of Operation section. During normal operation in the 1100V ac mode, internal software monitors the output and makes corrections or trips the instrument into standby. This internal monitoring can cause difficulty when troubleshooting a faulty High Volt[...]

Troubleshooting Component-level Troubleshooting 5 5-79 1 V 10 ms F5-32.EPS Figure 5-32. Waveform at Pin 18 of Hybrid H4 13. Connect an oscilloscope to pin 7 of U3B and verify it displays a square w ave equal to the positive peaks of Figure 5-32. Next, connect the oscilloscope to pin 1 of U3A and verify it displays a square wave equal to the negativ[...]

5700A/5720A Series II Calibrator Service M anual 5-80 1. Power up the Calibrator. In the following steps, reference all measurements to PACOM (TP10) unless otherw ise Noted. 2. Set the Calibrator to 22V at 1 kHz, operate. This configures the Power Amplifier assembly as an amplifier with a gain of -10 as shown in Figure 5-33. Check the input for the[...]

Troubleshooting Component-level Troubleshooting 5 5-81 7. Check the output of the Output Stage. Set the Calibrator to 0V dc, standby. Connect an external 100 Ω 1/4W carbon-film resistor between PACO M (TP10) and 1ST MID STAGE O UT, which is the left side of 1W resistor R41. Measure the dc voltage at the Mid-Stage output as is step 4. If the volta[...]

5700A/5720A Series II Calibrator Service M anual 5-82 DMM, measure the voltage at U9 pin 6 and verify it is the equal to the voltage at TP12 divided by 8 ±1%. If a failure is detected, check the HR8 resistor network, U9, and the associated components. 5-23. Troubleshooting the Filter/PA Supply Assembly (A18) Proceed as follows to troubleshoot the [...]

Troubleshooting Component-level Troubleshooting 5 5-83 J201. The +PA supply (at +180V)should go into current limit. The oscilloscope should show a repeating pattern in which the +PA supply climbs to about +180V then drops to 0V. If a failure is detected, check Q203, VR246, VR213, U201C, and associated components. 10. Check the unregulated -250V Sup[...]

5700A/5720A Series II Calibrator Service M anual 5-84[...]

6-1 Chapter 6 List of Replaceable Parts Title Page 6 - 1. I ntroductio n ......................................................................................... . 6 - 3 6 - 2. How to Obtain Part s ............................................................................ . 6 - 3 6 - 3. Manual Status I nfor m atio n .............................[...]

5700A/5720A Series II Calibrator Service M anual 6-2[...]

List of Replaceable Parts Introduction 6 6-3 6-1 . Introduct ion This section contains an illustrated list of replaceable parts for the 5700A/5720A Series II. Where applicable, parts differences are indicated between the 5700A and 5720A. For example, Table 6-1 indicates MP36 (nameplate) is PN 600723 for a 5700A or PN 600759 for a 5720A. Parts are l[...]

5700A/5720A Series II Calibrator Service M anual 6-4 6-5. Service Centers To locate a service center, use the information located in Contacting Fluke earlier in this manual. Manual Status Information Ref or Option No. Assembly Name Fluke Part No. Revision Level A1 Keyboard PCA 761049 D A2 Front Panel PCA 761031 102 A3 Analog Motherboard PCA 761023 [...]

List of Replaceable Parts Service Centers 6 6-5 Table 6- 1. Front Panel Final Assembly Reference Designator Description Fluke Stock No Tot Qty Notes A1 * KEYBOARD PCA 761049 1 A2 * FRON T PANEL PC A 761031 1 A3 * A NALOG MOTHERB OARD PCA 761023 1 A4 * DIGITA L MOTHERBOARD PC A 760942 1 A7 * CURRENT/HIGHT RESOLUTION OSCILLTOR. PCA 764613 1 A8 * S WI[...]

5700A/5720A Series II Calibrator Service M anual 6-6 5700A-T&B f6-1.e ps Figure 6-1. Front Panel Final Assembly[...]

List of Replaceable Parts Service Centers 6 6-7 Table 6-1. Chassis Final Assembly Reference Designator Description Fluke Stock No Tot Qty Notes A22 T RANSF ORMER/MODULE ASSEMBLY 813527 1 1 B1,B2 FAN/CONNECTOR ASSEMBLY 761213 2 E1 B INDING HEA D, PLATED 102889 1 F1 FUSE,.25X1.25,1.25A,250V,SLOW 109231 1 H1 INSULATOR, ANA LOG BOTTOM 775361 1 H2 S CRE[...]

5700A/5720A Series II Calibrator Service M anual 6-8 5700A T&B (1 of 2) f61a1.eps Figure 6-2. Chassis Final Assembly[...]

List of Replaceable Parts Service Centers 6 6-9 5700A T&B (2 of 2) f61a2.eps Figure 6-2. Chassis Final Assembly (cont)[...]

5700A/5720A Series II Calibrator Service M anual 6-10 Table 6-1. Rear Panel Final Assembly Reference Designator Description Fluke Stock No Tot Qty Notes F1 FUSE,.25X 1.25,1.25A,250V,SLOW 851936 1 H1 FILTER, AIR 813493 1 H3 SCREW,CA P,SCKT,SS ,8-32,.375 837575 4 H7 S CREW,PH ,P,LOCK,STL,6-32,.750 114223 6 H13 SC REW,PH,P,LOC K,STL,6-32,.250 152140 1[...]

List of Replaceable Parts Service Centers 6 6-11 5700A-T&B f61b.eps Figure 6-3. Rear Panel Final Assembly[...]

5700A/5720A Series II Calibrator Service M anual 6-12 Table 6-2. A1 Keyboard PCA Reference Designator Description Fluke Stock No Tot Qty Notes CR1-4 LED,GRE EN,SUBMINIA TURE 912241 4 DT1, DT2 * ISOLATOR,OPTO,OPTICAL S WITCH,INFRARED 523530 2 W1 CABLE, KEYBOARD/REAR PANEL 791657 1[...]

List of Replaceable Parts Service Centers 6 6-13 5700A-1603 57001603.EPS Figure 6-4. A1 Keyboard PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-14 Table 6-3. A2 Front Panel PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1, C2 C AP,TA,47UF,+-20% ,10V 746990 2 C4,C9-20,C28, C30,C35,C37, C39-046,C64 CAP,CE R,0.1UF,+-10%,25V,X 7R,1206 747287 747287 747287 26 C3,C21-27,C29, C31,C36,C38, C47-50,C66 CAP,TA,10U F,+-20%,25V,6032[...]

List of Replaceable Parts Service Centers 6 6-15 Table 6-3. A2 Front Panel PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes U12 * IC,CMOS,DU AL D F/F,+EDG TR G,SOIC 782995 1 U13 * IC,TTL,HEX INVERTER, W/OPEN COLL,S OIC 741249 1 U14-23 * IC,B IMOS,DISPLA Y DRIVER ,80V,PLCC 741231 10 U24 * IC,CMOS,PLD ,PROGRAMD,5700A-90724,P L[...]

5700A/5720A Series II Calibrator Service M anual 6-16 5700A-1602 57001602.EPS Figure 6-5. A2 Front Panel PCA[...]

List of Replaceable Parts Service Centers 6 6-17 Table 6-4. A3 Analog Motherboard PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1 CAP,POLYES,0.1UF,+-10%,50V 649913 1 C2 CAP,CER,1000P F,+-20%,50V,X7R 697458 1 C3 CAP,TA,1UF,+-20% ,35V 697417 1 C4 CAP,TA,4.7UF,+-20% ,25V 807644 1 C5 CAP,POLYES,0.47UF,+-10%,50V 697409 1 CR1,CR2 * D[...]

5700A/5720A Series II Calibrator Service M anual 6-18 5700A-1601 57001601.EPS Figure 6-6. A3 Analog Motherboard PCA[...]

List of Replaceable Parts Service Centers 6 6-19 Table 6-5. A4 Digital Motherboard PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1,C4 CAP ,TA,10UF,+-20%,35V 816512 2 C2 CAP,CER,1000P F,+-20%,50V,X7R 697458 1 C3 CAP,POLYES,0.1UF,+-10%,50V 649913 1 C5 CAP,POLYES,0.1UF,+-20%,250VAC 542233 1 C6 CAP,CER,6800P F,+-5%,100V,C0G 816710 [...]

5700A/5720A Series II Calibrator Service M anual 6-20 5700A-1605 57001605.EPS Figure 6-7. A4 Digital Motherboard PCA[...]

List of Replaceable Parts Service Centers 6 6-21 Table 6-6. A5 Wideband Output PCA, Option -03 Reference Designator Description Fluke Stock No Tot Qty Notes C1 CAP,CER,4.7P F,+-0.25PF,50V,C0G 721837 1 C2 CAP,CER,22P F,+-2%,50V,C0G 714832 1 C3 CAP,POLYES,0.047UF,+-10%,50V 820548 1 C4,C11-13,C66 CAP ,CER,100PF,+ -5%,50V,C0G 831495 5 C5 CAP,CER,470P F[...]

5700A/5720A Series II Calibrator Service M anual 6-22 Table 6-6. A5 Wideband Output PCA, Option -03 (cont) Reference Designator Description Fluke Stock No Tot Qty Notes Q17 * TRANS ISTOR,SI,N-JFET,TO-92 816314 1 Q2,Q03 * TRA NSISTOR,SI,N-D MOS FET,TO-72 394122 2 Q4-6 * TRA NSISTOR,S I,NPN,20V,500MW,MA CRO-T 659417 3 Q7,Q8 * PNP,2N5583 ,TRA NSISTOR,[...]

List of Replaceable Parts Service Centers 6 6-23 Table 6-6. A5 Wideband Output PCA, Option -03 (cont) Reference Designator Description Fluke Stock No Tot Qty Notes R69,R70 RES,MF,249,+-1% ,0.5W,100PPM 241281 2 R72,R73,R80-83 RES ,MF,909,+-1%,0.5W,100PP M 178053 6 R74 RE S,CF,20K,+-5% ,0.25W 441477 1 R75 RE S,MF,10K,+-1%, 0.125W,100PPM 168260 1 R78,[...]

5700A/5720A Series II Calibrator Service M anual 6-24 5700A-1611 57001611.EPS Figure 6-8. A5 Wideband Output PCA, Option -03[...]

List of Replaceable Parts Service Centers 6 6-25 Table 6-7. A6 Wideband Ocillator PCA, Option -03 Reference Designator Description Fluke Stock No Tot Qty Notes C1-8,C49-51 CAP ,TA,4.7UF,+-20%,25V 807644 11 C9,C10 CAP ,CER,2700PF,+ -5%,50V,C0G 832303 2 C11 CA P,CER,15P F,+-20%,50V,C0G 697524 1 C12,C15,C16, C18-25,C29-33, C35-48,C52, C57,C58,C60, C61[...]

5700A/5720A Series II Calibrator Service M anual 6-26 Table 6-7. A6 Wideband Ocillator PCA, Option -03 (cont) Reference Designator Description Fluke Stock No Tot Qty Notes L403 INDUCTOR,12UH,+-5%,47MHZ,SHLD 820720 1 L501 INDUCTOR,220UH,+-5%,9.4MHZ,SHLD 147835 1 L502,L504 INDUCTOR,15UH,+-5%,41MHZ,SHLD 806513 2 MP1 SHIELD, WID EBAND OS CILLATOR, FRON[...]

List of Replaceable Parts Service Centers 6 6-27 Table 6-7. A6 Wideband Ocillator PCA, Option -03 (cont) Reference Designator Description Fluke Stock No Tot Qty Notes R58,R112,R212, R312,R412,R512 RES ,MF,110,+-1%,0.125W,100PP M 820571 820571 6 R59 RE S,MF,14.3K,+-1%, 0.125W,100PPM 721803 1 R61 RE S,MF,2.49K,+-1%, 0.125W,100PPM 810523 1 R62,R64,R65[...]

5700A/5720A Series II Calibrator Service M anual 6-28 5700A-1610 57001610.EPS Figure 6-9. A6 Wideband Oscillator PCA, Option -03[...]

List of Replaceable Parts Service Centers 6 6-29 Table 6-8. A7 Current/High-Res Oscillator PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1,C71 CAP ,CER,0.22UF,+80-20% ,50V,Z5U 649939 2 C2,C3,C18-20, C29,C32-35,C47, C48,C50,C51, C55,C56 CAP,POLYES,0.1UF,+-10%,50V 649913 649913 649913 649913 16 C4,C5 CAP ,CER,100PF,+-2% ,100V,C0G[...]

5700A/5720A Series II Calibrator Service M anual 6-30 Table 6-8. A7 Current/High-Res Oscillator PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes Q2,Q5,Q16,Q18 * TRANS ISTOR,SI,NPN,SMA LL SIGNAL 698225 4 Q3,Q4,Q19 * TRANS ISTOR,SI,PNP,40V ,0.35W,TO-92 698233 3 Q6,Q7 * TRANSISTOR ,SI,BV=80V,10W ,TO-20 495689 2 Q8,Q9 * TRANSIST[...]

List of Replaceable Parts Service Centers 6 6-31 Table 6-8. A7 Current/High-Res Oscillator PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes TP1-5,TP7-13, TP16-20 JUMPER ,WIRE,NONIN SUL,0.200CTR 816090 816090 17 U2,U3 * IC,OP A MP,PRECISION ,LOW NOISE 782920 2 U4,U22 * IC,OP AMP,JFET INP UT,22V SUPP LY,DIP 832584 2 U5,U18 * I[...]

5700A/5720A Series II Calibrator Service M anual 6-32 5700A-1621 57001621.EPS Figure 6-10. A7 Current/HIgh-Res Oscillator PCA[...]

List of Replaceable Parts Service Centers 6 6-33 Table 6-9. A8 Switch Matrix PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1,C3,C18 CAP ,CER,470PF,+ -10%,50V,C0G 733071 3 C2,C5 CAP ,CER,33PF,+-5% ,50V,C0G 714543 2 C4 CAP,CER,0.01U F,+80-20%,50V,Z5V 697284 1 C6-9,C12 C13, C15,C16 C21, C25-27 CAP,POLYES,0.22UF,+-5%,50V 747519 747[...]

5700A/5720A Series II Calibrator Service M anual 6-34 Table 6-9. A8 Switch Matrix PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes R27,R28 RES,CF,620,+-5% ,0.25W 810408 2 R29,R30 RES,MF,14.3,+-1% ,0.125W,100PPM 831396 2 R32 RE S,MF,10,+-1%,0.125W,100P PM 820399 1 R36,R37 RES,MF,4.99K,+-1% ,0.125W,100PPM 721548 2 R38 RE SISTO[...]

List of Replaceable Parts Service Centers 6 6-35 5700A-1622 57001622.EPS Figure 6-11. A8 Switch Matrix PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-36 Table 6-10. A9 Ohms Cal PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1,C28,C29 C55 CAP,POLYES,0.1UF,+-10%,50V 649913 4 C2,C3,C32,C35 CA P,CER,1000P F,+-20%,100V,X7R 816181 4 C4,C5,C8,C10, C14,C15,C31, C37-43 C45 CAP,POLYES,0.22UF,+-5%,50V 747519 747519 747519 15 C6 CAP,CER,[...]

List of Replaceable Parts Service Centers 6 6-37 Table 6-10. A9 Ohms Cal PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes TP1,TP2,TP5-20 JUMP ER,WIRE, NONINSUL,0.200CTR 816090 18 U1-3 * IC ,OP AMP,LO-OFFSE T VOLTAGE,LO-NOIS E 605980 3 U4 * IC,OP AMP,P RECISION,LOW N OISE 782920 1 U5 * IC,OP AMP,GE N PURPOSE ,COMPEMSATE D 402[...]

5700A/5720A Series II Calibrator Service M anual 6-38 5700A-1631 57001631.EPS Figure 6-12. A9 Ohms Cal PCA[...]

List of Replaceable Parts Service Centers 6 6-39 Table 6-11. A10 Ohms Main PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1,C2,C7 C10- 13,C16 CAP,POLYES,0.22UF,+-5%,50V 747519 747519 8 C3,C4 CAP ,TA,10UF,+-20%,35V 816512 2 C6 CAP,TA,4.7UF,+-20% ,25V 807644 1 H3-6 RIVET,S-TUB,OVA L,AL,.087,.343 838458 4 H7,H8 SCREW ,PH,P,LOCK,S T[...]

5700A/5720A Series II Calibrator Service M anual 6-40 5700A-1630 57001630.EPS Figure 6-13. A10 Ohms Main PCA[...]

List of Replaceable Parts Service Centers 6 6-41 Table 6-12. A11 DAC PCA Reference Designator Description Fluke Stock No Tot Qty Notes A1 DAC FILTER SIP PCA 761395 1 A2 * D AC BUFFE RED REFE RENCE SIP PCA 764639 1 C1,C2,C4-8,C10, C11,C13-18, C21, C23-26, C41,C42 C46-49,C53-56, C58,C62,C64, C65,C76,C77, C81,C86-88, C91, C92,C96-98,C100 C104-109 CAP,[...]

5700A/5720A Series II Calibrator Service M anual 6-42 Table 6-12. A11 DAC PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes MP31 MOLDED COVER, REF. HYBRID 797746 1 P401,P402 CONN,DIN41612,TYPE C,RT ANG,64 PIN 807800 2 Q1 * TRANSISTOR,SI,BV=60V,65W,TO-220 386128 1 Q2,Q3 * TRANSISTOR,SI,BV=40V,40W,TO-220 369660 2 1 Q4-7,Q11,Q22[...]

List of Replaceable Parts Service Centers 6 6-43 Table 6-12. A11 DAC PCA (cont) Reference Designator Description Fl uke Stock No Tot Qty Notes R68 RE S,MF,40K,+-0.1%, 0.125W,100PPM 821702 1 R69 RE S,MF,18.12K,+-0.1%, 0.125W,50PPM 734020 1 R72 RE S,CF,200,+-5%,0.25W 810390 1 R74 * RES,C ERM,470K,+-5% ,.125W,200PPM 746792 1 R79-81 * RES,CERM,100K,+ -[...]

5700A/5720A Series II Calibrator Service M anual 6-44 Table 6-12. A11 DAC PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes VR13 * ZENER 5243 SMR,ZENER,UNCOMP,13V ,5%,9.5MA,0.2W,SOT-23 642477 1 VR18,VR22 * ZENE R 5245 SMR,ZENER,UNCOMP,15V,5% ,8.5MA,0.2W,SOT-23 837187 2 VR25 * ZENER,UNCOMP ,3.3V,10%,20.0MA,0.4W 309799 1 VR26 *[...]

List of Replaceable Parts Service Centers 6 6-45 5700A-1640 57001640.EPS Figure 6-14. A11 DAC PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-46 Table 6-13. A11A1 DAC Filter SIP PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1-6 CAP,POLYES,0.33UF,+-20%,50V 853903 6 C10,C11 CAP,POLY PR,1UF,+-5%,50V ,HERMETIC 783811 2 C12,C13 CAP,CER ,0.22UF,+80-20%,50V,Y 5V,1206 740597 2 C14 CA P,CER,100P F,+-10%,50V,C0G,1206 740571 1 [...]

List of Replaceable Parts Service Centers 6 6-47 5700A-1643 57001643.EPS Figure 6-15. A11A1 DAC Filter SIP PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-48 Table 6-14. A11 A2 DAC Buffered Reference SIP PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1,C5 CAP ,CER,10PF,+-10% ,100V,C0G,1206 806943 2 C2,C3 CAP ,CER,0.22UF,+80-20% ,50V,Y5V 740597 2 C4,C6 CAP ,CER,1000PF,+-10% ,50V,C0G,1206 747378 2 P11 HEADER,2 R OW,.100CTR,RT ANG,10[...]

List of Replaceable Parts Service Centers 6 6-49 5700A-1644 57001644.EPS Figure 6-16. A11A2 DAC Buffered Reference SIP PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-50 Table 6-15. A12 Oscillator Control PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1-4,C12 C14, C16,C18 C48 C AP,TA,4.7UF,+-20% ,25V 807644 807644 9 C8,C10 CAP ,AL,2.2UF,+-20%,50V 769687 2 C21 CA P,CER,10P F,+-10%,3000V,C0G 817049 1 C22,C25 CAP,TA,330UF,+ -20%,3V 385963 2 C23,[...]

List of Replaceable Parts Service Centers 6 6-51 Table 6-15. A12 Oscillator Control PCA (cont) Reference Designator Description Fl uke Stock No Tot Qty Notes R3 RES,MF,143K,+-1%,0.125W,100PPM 291336 1 R4,R12 RES,CF,3K,+-5%,0.25W 441527 2 R5,R13,R25 R48, R52,R53 R68, R69 RES,CF,1K,+-5%,0.25W 343426 343426 343426 8 R6 RES,CF,750,+-5%,0.25W 810374 1 R[...]

5700A/5720A Series II Calibrator Service M anual 6-52 Table 6-15. A12 Oscillator Control PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes U25 * IC,VOLT RE G,FIXED,+5 VOLTS ,1.5 AMPS 428847 1 VR1,VR2 * ZENER,UNCOMP ,10.0V,5%,12.5MA,0.4W 246611 2 VR3 * ZENER,UNCOMP,5.1V,5% ,20.0MA,0.4W 159798 1 VR4 * ZENER,UNCOMP,6.8V,2% ,175.[...]

List of Replaceable Parts Service Centers 6 6-53 5700A-1650 57001650.EPS Figure 6-17. A12 Oscillator Control PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-54 Table 6-16. A13 Oscillator Output PCA Reference Designator Description Fluke Stock No Tot Qty Notes C2-4,C16, C20, C23 C26-28,C32, C33,C46,C47, C51,C52,C54, C55,C68-71 C88- 92,C102-104, C110,C111, C113,C114 CAP,POLYES,0.22UF,+-5%,50V 747519 747519 747519 747519 747519 747519 747519 747519 33 C5,[...]

List of Replaceable Parts Service Centers 6 6-55 Table 6-16. A13 Oscillator Output PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes MP13-15 SPACER,.375 RND,SOLUBLE,.10THK 837823 3 P511,P512 CONN,DIN41612,TYPE C,RT ANG,64 PIN 807800 2 Q6 * TRANSIS TOR,SI,N-JFET,TO-92 832162 1 Q7 * TRANSIS TOR,SI,N-DMOS FE T,TO-72 394122 1 Q8 [...]

5700A/5720A Series II Calibrator Service M anual 6-56 Table 6-16. A13 Oscillator Output PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes U11 * RES N ET HYBRID, TE STED 793885 1 U12,U32,U33 * IC,CMOS,OCTL D F/F W/ 3-STATE,+EDG TR G 585364 3 U15,U16,U19 * IC,BPLR,FOUR -QUADRANT MULT,16 P IN DIP 343335 3 U17,U27 * IC,CMOS,DUA L[...]

List of Replaceable Parts Service Centers 6 6-57 5700A-1651 57001651.EPS Figure 6-18. A13 Oscillator Output PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-58 Table 6-17. A13A1 Oscillator Wideband SMD PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1,C3,C4,C6-8, C12,C13 CAP,C ER,0.22UF,+80-20% ,50V,Y5V 740597 740597 8 C2 CAP,CER,100P F,+-10%,50V,C0G,1206 740571 1 C5 CAP,CER,10P F,+-10%,100V,C0G,1206 806943 1 C9 CAP,CER,470P F,+-10%,[...]

List of Replaceable Parts Service Centers 6 6-59 5700A-1652 57001652.EPS Figure 6-19. A13A1 Oscillator Wideband SMD PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-60 Table 6-18. A14 High Voltage Control PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1 CAP,POLYES,0.72UF,+-20%,1300V 853929 1 C2 CAP,POLYES,0.1UF,+-20%,1400V 821512 1 C3,C4 CAP,A L,470UF,+-20%,16V,SOLV P ROOF 772855 2 C5 CAP,POLYES,1UF,+-10%,50V 733089 1 C6,C7 CAP ,TA,10UF,+-2[...]

List of Replaceable Parts Service Centers 6 6-61 Table 6-18. A14 High Voltage Control PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes R28 RE S,MF,20.5K,+-1%, 0.125W,100PPM 655233 1 R30-32 RES ,MF,18.2K,+-1%,0.125W,100P PM 756429 3 R35-39,R50,R52 RES ,MF,196K,+-1%,0.125W,100P PM 769984 7 R40,R41 RES,MF,464K,+-1% ,0.125W,100P[...]

5700A/5720A Series II Calibrator Service M anual 6-62 5700A-1661 57001661.EPS Figure 6-20. A14 High Voltage Control PCA[...]

List of Replaceable Parts Service Centers 6 6-63 Table 6-19. A15 High Voltage/High Current PCA Reference Designator Description Fluke Stock No Tot Qty Notes C2,C29,C42 CAP,POLYES,0.01UF,+-10%,50V 715037 3 C4 CAP,POLYP R,0.022UF,+-5%,1500V 806968 1 C5,C15-17,C20, C21 C23-28,C32 C33,C35,C38,C40 CAP,POLYES,0.1UF,+-10%,50V 649913 649913 649913 17 C6 CA[...]

5700A/5720A Series II Calibrator Service M anual 6-64 Table 6-19. A15 High Voltage/High Current PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes R1,R72 RES ,CF,1K,+-5%,0.25W 343426 2 R2,R15,R39 RES,C F,100K,+-5%,0.25W 348920 3 R4,R11,R51 R53, R61-64,R74 RES ,CF,100,+-5%,0.25W 348771 348771 9 R5 RES,CF,1.5K,+-5% ,0.25W 810432[...]

List of Replaceable Parts Service Centers 6 6-65 5700A-1660 57001660.EPS Figure 6-21. A15 High Voltage/High Current PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-66 Table 6-20. A16 Power Amplifier PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1,C2 CAP ,CER,10PF,+-10% ,3000V,C0G 817049 2 C3 CAP,MICA,560PF,+ -5%,500V 170431 1 C4,C28 CAP ,CER,0.02UF,+-20% ,500V,Z5U 407403 2 C5,C75 CAP,POLYES,0.047UF,+-10%,50V 820548 2 C6,C17,C23 CAP ,CER,2[...]

List of Replaceable Parts Service Centers 6 6-67 Table 6-20. A16 Power Amplifier PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes MP7-8 HEAT DIS,PRESS ON,TO-5 418384 2 MP20-23 INSUL PT,TRA NSISTOR MOUN T,DAP,TO-5 152207 4 MP41,MP42, MP45-47 SCREW ,PH,P,LOCK,S TL,6-32,.250 152140 152140 5 MP43,MP44 EJE CTOR,PWB, NYLON 494724 [...]

5700A/5720A Series II Calibrator Service M anual 6-68 Table 6-20. A16 Power Amplifier PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes R28,R29,R34, R47 RES,MF,499K,+-1% ,0.125W,100PPM 714980 714980 4 R30 RE S,CF,330,+-5%,0.25W 830596 1 R31 RE S,CF,100K,+-5% ,0.25W 658963 1 R35,R74,R139 RES ,CF,20,+-5%,0.25W 810382 3 R36,R141[...]

List of Replaceable Parts Service Centers 6 6-69 5700A-7670 57001670.EPS Figure 6-22. A16 Power Amplifier PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-70 Table 6-21. A16A1 Power Amplifier Digital Control SIP PCA Reference Designator Description Fluke Stock No Tot Qty Notes C52 CA P,AL,15UF,+-20% ,35V 614024 1 C53,C56 CAP,CER ,33PF,+-5%,50V,C 0G 714543 2 C54 CA P,CER,470P F,+-10%,50V,C0G 733071 1 C55,C57 CAP,POLYES,0.22UF,+-5%,50V 747519 2 L4 CHOK[...]

List of Replaceable Parts Service Centers 6 6-71 5700A-1671 Figure 6-23. A16A1 Power Amplifier Digital Control SIP PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-72 Table 6-22. A17 Regulator/Guard Crossing PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1,C2,C4,C6, C7,C9 C11,C12, C14-16,C19-23, C27,C28 CAP,AL,10UF,+ -20%,50V,SOLV PR OOF 799437 799437 799437 799437 18 C3,C10,C18,C25 CA P,CER,0.05UF,+ -20%,100V,Z5V 149161 4 C5,C24,C29, C102[...]

List of Replaceable Parts Service Centers 6 6-73 Table 6-22. A17 Regulator/Guard Crossing PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes R54 RE S,CF,1.8K,+-5% ,0.25W 441444 1 R56 RE S,CF,150,+-5%,0.25W 343442 1 R57 RE S,CF,100,+-5%,0.25W 348771 1 R60,R61 THERMISTOR,DISC,P OS,100,+-20%,25C 851303 2 SW51 SWITCH,PUSHBUTTON,SP[...]

5700A/5720A Series II Calibrator Service M anual 6-74 5700A-1680 57001680.EPS Figure 6-24. A17 Regulator/Guard Crossing PCA[...]

List of Replaceable Parts Service Centers 6 6-75 Table 6-23. A18 Filter/PA Supply PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1,C10,C17 CAP,POLYES,0.22UF,+-5%,50V 747519 3 C2,C3 CAP ,AL,6800UF,+-20%.25V 782466 2 C4,C6 CAP,A L,1000UF,+-20%,50V,SOLV P ROOF 782391 2 C5,C19 CAP ,AL,2200UF,+-20%,25V,SOLV PROOF 782383 2 C7-9,C18 CA[...]

5700A/5720A Series II Calibrator Service M anual 6-76 Table 6-23. A18 Filter/PA Supply PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes Q201,Q202 * TRANS ISTOR,SI,N-MOS, 40W,500V,T0-220 782540 2 1 Q203,Q206 * PNP,2N 6520 R05A,TRANS ISTOR,SI,PNP ,350V,625MW,TO-92 602961 2 Q204,Q209, Q210, Q212 * * TRANSIS TOR,SI,P-MOS,500V,TO[...]

List of Replaceable Parts Service Centers 6 6-77 Table 6-23. A18 Filter/PA Supply PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes VR211,VR217, VR227,VR231 * * ZENER,UNCOMP,140.0V,5% ,1.8MA,1.0W 340703 340703 4 VR212,VR216, VR226,VR232 * * ZENER,UNCOMP,180V,2% ,0.68MA,0.4W 816348 816348 4 VR214,VR230, VR246,VR247 * * ZENER,U[...]

5700A/5720A Series II Calibrator Service M anual 6-78 5700A-7690 57001690.EPS Figure 6-25. A18 Filter/PA Supply PCA[...]

List of Replaceable Parts Service Centers 6 6-79 Table 6-24. A19 Digital Power Supply PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1 CAP,AL,470UF,+-20% ,160V 816835 1 C2 C AP,AL,10UF,+-20% ,160V,SOLV PROOF 817064 1 C3 CAP,AL,330UF,+-20% ,100V,SOLV PR OOF 816785 1 C4,C9 CAP,A L,10UF,+-20%,63V,SOLV P ROOF 816843 2 C5,C11 CAP ,CE[...]

5700A/5720A Series II Calibrator Service M anual 6-80 Table 6-24. A19 Digital Power Supply PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes R3,R12 RES ,CF,100K,+-5%,0.25W 348920 2 R4 RES,CC,4.7K,+ -5%,0.25W 348821 1 R5 RES,CF,12,+-5%,0.25W 442178 1 R6 RES,CC,10K,+ -10%,2W 641123 1 R7 RES,CC,2,+-5% ,0.5W 641057 1 R8 RES,CF,12[...]

List of Replaceable Parts Service Centers 6 6-81 5700A-1604 57001604.EPS Figure 6-26. A19 Digital Power Supply PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-82 Table 6-25. A20 CPU PCA Ref Des Description Part Number Qty C1 CAPACITOR SMR,CAP,TA,220UF,+-20%,10V,7343H 106021 1 C2-4,C6-7 C14-16 C18, C101-111, C113, C115, C116, C119- 120, C125- 133, C142- 143, C152 CAPACITOR SMR,CAP,CER,0.1UF,+-10%,50V,X7R,0805 690500 37 C5 CAPACITOR SMR,CAP,TA,15UF,+-20%,3[...]

List of Replaceable Parts Service Centers 6 6-83 Table 6-26. A20 CPU PCA (cont) Ref Des Description Part Number Qty U19 IC,ME MORY,SRAM,7C 1021,1MB,64KX16,5V,15NS ,TSOP44,TAPE 1609432 1 U25, U27-29 CMOS 74HCT244 SMR,IC,CMOS ,OCTL LINE DRVR,S OIC 742593 4 U26, U30 CMOS 74HCT245 SMR,IC,C MOS,OCTAL BUS TRANSCE IVER,SOIC 742577 2 U31 CMOS 68C681 S M,IC[...]

5700A/5720A Series II Calibrator Service M anual 6-84 57001606.EPS Figure 6-27. A20 CPU PCA[...]

List of Replaceable Parts Service Centers 6 6-85 Table 6-27. A21 Rear Panel PCA Reference Designator Description Fluke Stock No Tot Qty Notes C1,C3,C5 CAP,C ER,330PF,+-5% ,50V,C0G 697441 3 C4,C21,C22,C24- 32,C34,C36,C37, C40-45,C48,C49 CAP,POLYES,0.1UF,+-10%,50V 649913 649913 649913 23 C6,C7 CAP ,CER,0.22UF,+80-20% ,50V,Z5U 649939 2 C8 CAP,CER,4700[...]

5700A/5720A Series II Calibrator Service M anual 6-86 Table 6-27. A21 Rear Panel PCA (cont) Reference Designator Description Fluke Stock No Tot Qty Notes U13 * IC,OP AMP,JFE T INPUT,22V SUPP LY,DIP 832584 1 U14 * IC,CMOS,P ROGRMBL PER IPHERAL IN TERFACE 780650 1 U16,U17 * IC,BIMOS ,8 CHNL HI-VOLT DRVR W/LATCH 782912 2 U18 * IC,COMPARATOR,HI-SPEED,1[...]

List of Replaceable Parts Service Centers 6 6-87 5700A-1609 57001609.EPS Figure 6-28. A21 Rear Panel PCA[...]

5700A/5720A Series II Calibrator Service M anual 6-88[...]

7-1 Chapter 7 Schematic Diagrams Figure Tit l e Page 7-1. A1 Keyboard Assembly ......................................................................... 7-3 7-2. A2 Front Panel PCA ............................................................................... 7-5 7-3. A3 Analog Motherboard PCA ......................................................[...]

5700A/5720A Series II Calibrator Service M anual 7-2[...]

7 Schematic Diagrams 7-3 Figure 7-1. A1 Keyboard PCA[...]

5700A/5720A Series II Service Manual 7-4 Figure 7-1. A1 Keyboard PCA (cont)[...]

7 Schematic Diagrams 7-5 Figure 7-2. A2 Front Panel (PCA)[...]

5700A/5720A Series II Service Manual 7-6 Figure 7-2. A2 Front Panel PCA (cont)[...]

7 Schematic Diagrams 7-7 Figure 7-2. A2 Front Panel PCA (cont)[...]

5700A/5720A Series II Service Manual 7-8 Figure 7-2. A2 Front Panel PCA (cont)[...]

7 Schematic Diagrams 7-9 Figure 7-2. A2 Front Panel PCA (cont)[...]

5700A/5720A Series II Service Manual 7-10 Figure 7-3. A3 Analog Motherboard PCA[...]

7 Schematic Diagrams 7-11 Figure 7-23. A3 Analog Motherboard PCA (cont)[...]

5700A/5720A Series II Service Manual 7-12 Figure 7-3. A3 Analog Motherboard PCA (cont)[...]

7 Schematic Diagrams 7-13 Figure 7-3. A3 Analog Motherboard PCA (cont)[...]

5700A/5720A Series II Service Manual 7-14 Figure 7-3. A3 Analog Motherboard PCA (cont)[...]

7 Schematic Diagrams 7-15 5700A-1605 Figure 7-4. A4 Digital Motherboard PCA[...]

5700A/5720A Series II Service Manual 7-16 Figure 7-4. A4 Digital Motherboard PCA (cont)[...]

7 Schematic Diagrams 7-17 ahp46f.tif Figure 7-4. A4 Digital Motherboard PCA (cont)[...]

5700A/5720A Series II Service Manual 7-18 Figure 7-4. A4 Digital Motherboard PCA (cont)[...]

7 Schematic Diagrams 7-19 5700A-1611 Figure 7-5. A5 W ideband Output PCA (Option -03)[...]

5700A/5720A Series II Service Manual 7-20 Figure 7-5. A5 Wideband Output PCA (Option -03) (cont)[...]

7 Schematic Diagrams 7-21 Figure 7-5. A5 Wideband Output PCA (Option -03) (cont)[...]

5700A/5720A Series II Service Manual 7-22 Figure 7-5. A5 W ideband Output PCA (Option -03) (cont)[...]

7 Schematic Diagrams 7-23 5700A-7610 Figure 7-6. A6 W ideband Oscillator PCA (Option -03)[...]

5700A/5720A Series II Service Manual 7-24 Figure 7-6. A6 Wideband Output PCA (Option -03)[...]

7 Schematic Diagrams 7-25 Figure 7-6. A6 Wideband Oscillator PCA (Option -03) (cont)[...]

5700A/5720A Series II Service Manual 7-26 Figure 7-6. A6 Wideband Oscillator PCA (Option -03) (cont)[...]

7 Schematic Diagrams 7-27 5700A-1621 Figure 7-7. A7 Current/High-Resolution Oscillator PCA[...]

5700A/5720A Series II Service Manual 7-28 Figure 7-7. A7 Current/High-Resolution Oscillator PCA (cont)[...]

7 Schematic Diagrams 7-29 Figure 7-7. A7 Current/High-Resolution Oscillator PCA (cont)[...]

5700A/5720A Series II Service Manual 7-30 Figure 7-7. A7 Current/High-Resolution Oscillator PCA (cont)[...]

7 Schematic Diagrams 7-31 Figure 7-7. A7 Current/High-Resolution Oscillator PCA (cont) 5700A-1021 (4 of 4)[...]

5700A/5720A Series II Service Manual 7-32 5700A-1622 Figure 7-8. A8 Switch Matrix PCA[...]

7 Schematic Diagrams 7-33 Figure 7-8. A8 Swith Matrix PCA (cont)[...]

5700A/5720A Series II Service Manual 7-34 Figure 7-8. A8 Switch Matrix PCA (cont)[...]

7 Schematic Diagrams 7-35 Figure 7-8. A8 Swith Matrix PCA (cont)[...]

5700A/5720A Series II Service Manual 7-36 Figure 7-8. A8 Switch Matrix PCA (cont)[...]

7 Schematic Diagrams 7-37 Figure 7-8. A8 Swith Matrix PCA (cont)[...]

5700A/5720A Series II Service Manual 7-38 5700A-1631 Figure 7-9. A9 Ohms Cal PCA[...]

7 Schematic Diagrams 7-39 Figure 7-9. A9 Ohms Cal PCA (cont)[...]

5700A/5720A Series II Service Manual 7-40 Figure 7-9. A9 Ohms Cal PCA (cont)[...]

7 Schematic Diagrams 7-41 Figure 7-9. A9 Ohms Cal PCA (cont)[...]

5700A/5720A Series II Service Manual 7-42 Figure 7-9. A9 Ohms Cal PCA (cont)[...]

7 Schematic Diagrams 7-43 5700A-1630 Figure 7-10. A10 Ohms Main PCA[...]

5700A/5720A Series II Service Manual 7-44 Figure 7-10. A10 Ohms Main PCA (cont)[...]

7 Schematic Diagrams 7-45 Figure 7-10. A10 Ohms Main PCA[...]

5700A/5720A Series II Service Manual 7-46 Figure 7-10. A10 Ohms Main PCA (cont)[...]

7 Schematic Diagrams 7-47 Figure 7-10. A10 Ohms Main PCA[...]

5700A/5720A Series II Service Manual 7-48 Figure 7-11. A11 DAC PCA 5700A-7640[...]

7 Schematic Diagrams 7-49 Figure 7-11. A11 DAC PCA (cont)[...]

5700A/5720A Series II Service Manual 7-50 R23 6.8 C42 22uF 1 2 3 7 6 5 4 R128 200K C1 12 22uF U5 OP A527 Figure 7-11. A11 DAC PCA (cont)[...]

7 Schematic Diagrams 7-51 Figure 7-11. A11 DAC PCA (cont)[...]

5700A/5720A Series II Service Manual 7-52 Figure 7-11. A11 DAC PCA (cont)[...]

7 Schematic Diagrams 7-53 Figure 7-11. A11 DAC PCA (cont)[...]

5700A/5720A Series II Service Manual 7-54 Figure 7-11. A11 DAC PCA (cont)[...]

7 Schematic Diagrams 7-55 Figure 7-12. A11A1 DAC Filter SIP PCA[...]

5700A/5720A Series II Service Manual 7-56 Figure 7-13. A1142 DAC Buffered Reference SIP PCA[...]

7 Schematic Diagrams 7-57 5700A-7650 Figure 7-14. A12 Oscillator Control PCA (cont)[...]

5700A/5720A Series II Service Manual 7-58 DG211 DG211 DG211 DG211 DG211 3. ALL GND CONNECTIONS DENOTED WITH A 1 ARE BUSSED AND CONNECTED TO GND3 A T ONE POINT . 4. C5 AND C55 ARE NOT INST ALLED . Figure 7-14. A12 Oscillator Control PCA (cont)[...]

7 Schematic Diagrams 7-59 Figure 7-14. A12 Oscillator Control PCA (cont)[...]

5700A/5720A Series II Service Manual 7-60 Figure 7-14. A12 Oscillator Control PCA (cont)[...]

7 Schematic Diagrams 7-61 5700A-1651 Figure 7-15. A13 Oscillator Output PCA[...]

5700A/5720A Series II Service Manual 7-62 Figure 7-15. A13 Oscillator Output PCA (cont)[...]

7 Schematic Diagrams 7-63 Figure 7-15. A13 Oscillator Output PCA (cont)[...]

5700A/5720A Series II Service Manual 7-64 Figure 7-15. A13 Oscillator Output PCA (cont)[...]

7 Schematic Diagrams 7-65 5700A-1652 Figure 7-16. A13A1 Oscillator Wideband SMD PCA[...]

5700A/5720A Series II Service Manual 7-66 Figure 7-16. A13A1 Oscillator Wideband SMD PCA (cont)[...]

7 Schematic Diagrams 7-67 5700A-1661 Figure 7-17. A14 High V oltage Control PCA[...]

5700A/5720A Series II Service Manual 7-68 Figure 7-17. A14 High V oltage Control PCA (cont)[...]

7 Schematic Diagrams 7-69 Figure 7-17. A14 High V oltage Control PCA (cont)[...]

5700A/5720A Series II Service Manual 7-70 Figure 7-17. A14 High V oltage Control PCA (cont)[...]

7 Schematic Diagrams 7-71 Figure 7-17. A14 High V oltage Control PCA (cont)[...]

5700A/5720A Series II Service Manual 7-72 5700A-1660 Figure 7-18. A15 High V oltage/ High Current PCA[...]

7 Schematic Diagrams 7-73 Figure 7-18. A15 High V oltage/High Current PCA (cont)[...]

5700A/5720A Series II Service Manual 7-74 Figure 7-18. A15 High V oltage/High Current PCA (cont)[...]

7 Schematic Diagrams 7-75 5700A-7670 Figure 7-19. A16 Power Amplifier PCA[...]

5700A/5720A Series II Service Manual 7-76 4. NOT INST ALLED STD1N890 STD1N890 4. Figure 7-19. A16 Power Amplifier PCA (cont)[...]

7 Schematic Diagrams 7-77 Figure 7-19. A16 Power Amplifier PCA (cont) 10 M 2N4044[...]

5700A/5720A Series II Service Manual 7-78 Figure 7-19. A16 Power Amplifier PCA (cont)[...]

7 Schematic Diagrams 7-79 5700A-1671 Figure 7-20. A16A1 Power Amplifier Digitial Control SIP PCA[...]

5700A/5720A Series II Service Manual 7-80 Figure 7-20. A161A1 Power Amplifier Digital Control SIP PCA (cont)[...]

7 Schematic Diagrams 7-81 Figure 7-21. A17 Regulator/Guard Crossing PCA 5700A-1680[...]

5700A/5720A Series II Service Manual 7-82 Figure 7-21. A17 Regulator/Guard Crossing PCA (cont)[...]

7 Schematic Diagrams 7-83 Figure 7-21. A17 Regulator/Guard Crossing PCA (cont)[...]

5700A/5720A Series II Service Manual 7-84 Figure 7-22. A18 Filter/PA Supply PCA 5700A-7690[...]

7 Schematic Diagrams 7-85 Figure 7-22. A18 Filter/PA Supply PCA (cont)[...]

5700A/5720A Series II Service Manual 7-86 Figure 7-22. A18 Filter/PA Supply PCA (cont)[...]

7 Schematic Diagrams 7-87 5700A-1604 Figure 7-23. A19 Digital Power Supply PCA[...]

5700A/5720A Series II Service Manual 7-88 Figure 7-23. A19 Digital Power Supply PCA (cont)[...]

7 Schematic Diagrams 7-89 Figure 7-24. A20 CPU PCA[...]

5700A/5720A Series II Service Manual 7-90 Figure 7-24. A20 CPU PCA (cont)[...]

7 Schematic Diagrams 7-91 Figure 7-24. A20 CPU PCA (cont)[...]

5700A/5720A Series II Service Manual 7-92 Figure 7-24. A20 CPU PCA (cont)[...]

7 Schematic Diagrams 7-93 Figure 7-24. A20 CPU PCA (cont)[...]

5700A/5720A Series II Service Manual 7-94 Figure 7-24. A20 CPU PCA (cont)[...]

7 Schematic Diagrams 7-95 Figure 7-25. A21 Real Panel PCA[...]

5700A/5720A Series II Service Manual 7-96 Figure 7-25. A21 Rear Panel PCA (cont)[...]

7 Schematic Diagrams 7-97 Figure 7-25. A21 Rear Panel PCA (cont)[...]

5700A/5720A Series II Service Manual 7-98 Figure 7-25. A21 Rear Panel PCA (cont)[...]

7 Schematic Diagrams 7-99 Figure 7-25. A21 Rear Panel PCA (cont)[...]

5700A/5720A Series II Service Manual 7-100 Figure 7-25. A21 Rear Panel PCA (cont)[...]

7 Schematic Diagrams 7-101 Figure 7-26. Hybrids[...]

5700A/5720A Series II Service Manual 7-102 Figure 7-26. Hybrids (cont)[...]

7 Schematic Diagrams 7-103 Figure 7-26. Hybrids (cont)[...]

5700A/5720A Series II Service Manual 7-104 Figure 7-26. Hybrids (cont)[...]

7 Schematic Diagrams 7-105 Figure 7-26. Hybrids (cont)[...]

5700A/5720A Series II Service Manual 7-106[...]