National Instruments NI 5620 manual


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Table of contents for the manual

  • Page 1

    Computer-Based Instruments NI 5620 User Manual Digitizer for PXI NI 5620 User Manual ™ June 2001 Edition Part Number 322949 B-01[...]

  • Page 2

    Support Worldwide Technical Support and Product Information National Instruments Corporate Headquarters 11500 North Mopac Expressway Austin, Texas 78759-3504 USA Tel: 512 794 0100 Worldwide Offices Australia 03 9879 5166, Austria 0662 45 79 90 0, Belgium 02 757 00 20, Brazil 011 284 5011, Canada (Calgary) 403 274 9391, Canada (Montreal) 514 [...]

  • Page 3

    Important Information Warranty The NI 5620 is warranted ag ainst defects i n materials an d workmanshi p for a peri od of one ye ar from the da te of shipme nt, as eviden ced by receipts or other documenta tion. National Instruments will, at it s option, repair or replace equipment that proves to be defective during the warranty period. This warran[...]

  • Page 4

    Compliance FCC/Canada Radio Frequency Interference Compliance* Determining FCC Class The Federal Communications Commission (FCC) has rules to protect wireless communications from interference. The FCC places digital electronics into two classes. These classes are known as Class A (for use in industrial-commercial loc ations only) or Class B (for us[...]

  • Page 5

    Canadian Depart ment of Communications This Class B digital apparatus meets all requirements of the Canadian I nterference-Causing Equipment Regulations. Cet appareil num é rique de la classe B respecte toutes les exigences du R è gleme nt sur le mat é riel brouilleur du Canada. Compliance to EU Directives Readers in the European Union (EU) must[...]

  • Page 6

    Conventions The follo wing con ventions are used in this manual: < > Angle brackets that contain numbers separated by an ellipsis represent a range of values associated with a bit or signal name — for e xample, DBIO<3..0>. » The » symbol leads you through nested menu items and dialog box options to a final action. The sequence File?[...]

  • Page 7

    © National Instruments Corporatio n vii NI 5620 User Manual Contents Chapter 1 Taking Measurements with the NI 5620 Installing the Software and Hardware .............. .......................... ......................... .......... 1-1 Acquiring Data with Your NI 5620 ..................... ....................... ......................... ........[...]

  • Page 8

    © National Instruments Corporatio n 1-1 NI 5620 User Manual 1 T aking Measurements with the NI 5620 Thank you for buying a National In struments (NI) 5620 digitizer. This chapter provides information on installing, conn ecting signals to, and acquiring data from the NI 5620. The NI 5620 has the follo wing features: • One 14-bit, 64 MS/ s analog-[...]

  • Page 9

    Chapter 1 T aking Measurements w ith the NI 5620 NI 5620 User Manual 1-2 Acquiring Data with Y our NI 5620 You can acquire data programmatically either by writing an application for your NI 5620 or using on e of the examples that ships w ith NI-SCOPE. Programmatically Controlling Y our NI 5620 To help you get started programming yo ur NI 562[...]

  • Page 10

    Chapter 1 T ak ing Measuremen ts with the NI 5620 © National Instruments Corporatio n 1-3 NI 5620 User Manual Caution Do not operate the device in an e xplosive at mosphere or where there may be flammable gases or fumes. The device can only be operated at or belo w pollution degree 2, as stated in Appendix A, Specifications . P ollution is for eig[...]

  • Page 11

    © National Instruments Corporatio n 2-1 NI 5620 User Manual 2 Hardware Over view This chapter provides an overview of the feat ures and functionality of the NI 5620. How the NI 5620 W orks A signal follows this path through the NI 56 20 to your host computer: 1. The signal enters the NI 5620 throu gh the analog front panel connector , INPUT . T o [...]

  • Page 12

    Chapter 2 Hardware Over view NI 5620 User Manual 2-2 Connecting Signals Figure 2-2 shows the NI 5620 front panel, w hich contains three connectors — two SMA connectors and an SMB connector. One of the SMA connectors, INPUT , i s for attaching the analog inpu t signal you wish to measure. The second SMA connector, REF CLK IN, is a 50 Ω ,1[...]

  • Page 13

    Chapter 2 Hardware Over view © National Instruments Corporatio n 2-3 NI 5620 User Manual Conditioning the Signal—Impedance, Dither , Gain, and AC Coupling To minimize distortion, signals receive a minimal amount of conditioning. There is one set gain, and all signals are AC coupled, meaning that the NI 5620 rejects any DC portion of a signal . T[...]

  • Page 14

    Chapter 2 Hardware Over view NI 5620 User Manual 2-4 Incorporating the DDC You may optionally route the data through the DDC before storing it in onboard memory . The DDC is a digital signal processing (DSP) chip, the Intersil HSP50214B. The first stage uses a digital quadrature mixer that shifts a signal to baseband from any frequency withi[...]

  • Page 15

    Chapter 2 Hardware Over view © National Instruments Corporatio n 2-5 NI 5620 User Manual Block Diagram This block diagram is intended for advanced users. An explanation of some of these features follows. Figure 2-3. Block Diagram The digital downconverter is a dig ital signal processor (DSP ) that allo w s you to digitally zoom in on data, whi ch [...]

  • Page 16

    Chapter 2 Hardware Over view NI 5620 User Manual 2-6 acquisition clock in a free-r unning state, in which the acquisiti on clock is not synchronized to any e xternal reference. The voltage controlled c rystal oscillator (VCXO) is a 6 4 MHz clock. The trigge r and clock routing area directs clock signals and triggers. The TIO is the timing en[...]

  • Page 17

    Chapter 2 Hardware Over view © National Instruments Corporatio n 2-7 NI 5620 User Manual Figure 2-4. Multiple-Record Acquisition Timing Diagram T riggering You can externally trigger the NI 5620 t hrough the digital line, PFI1. You can also use software to trigger it. Figure 2-5 shows the different trigger sources. The digital triggers are TTL-lev[...]

  • Page 18

    Chapter 2 Hardware Over view NI 5620 User Manual 2-8 Synchronizing Multiple PXI Devices The NI 5620 uses a PLL to synchronize the 64 MHz sample clock to a 10 MHz reference clock. You can either supply the reference clock through the SMA connector (REF CLK IN) on the front panel or use the system reference clock on the PXI backplane. The PXI [...]

  • Page 19

    © National Instruments Corporatio n A- 1 NI 5620 User Manual A Specifications This appendix lists the sp ecifications of the NI 5620. These specifications are typical at 25 ° C unless otherwise specif ied. General Specifications Number of channels .. ......................... .... 1 Resolution .............. ......................... ....... 14 b[...]

  • Page 20

    Appendix A Specifications NI 5620 User Manual A-2 VSWR 0.1 to 25 MHz ...................... ............< 1.5:1 25 to 32 MHz ................. ..................< 3:1 Dither (can be disabled) Frequency range .... ...................... .... 15 kHz to 3 MHz Frequency Internal Sample Clo ck Frequency ........ ....................... ....[...]

  • Page 21

    Appendix A Specifications © National Instruments Corporatio n A- 3 NI 5620 User Manual Figure A-1. Frequency Response from 5 to 100 MHz Phase Group delay variation (5 to 25 MHz) .................... ..................... 9 ns pk-to-pk Group delay variation (0.5 to 30 MHz) ............... ....................... 26 ns p k-to-pk DDC Decimation rate [...]

  • Page 22

    Appendix A Specifications NI 5620 User Manual A-4 T riggering Modes ..................... .......................... ...... Immediate, software, digital Sources....................... ......................... .... PFI 1, RTSI<0..7>, PXI star Export ............. ......................... ...............RTSI<0..7>, PFI 1 Slope ..[...]

  • Page 23

    Appendix A Specifications © National Instruments Corporatio n A- 5 NI 5620 User Manual Environmental Specifications Calibration interval ... ......................... .... 1 year Warm-up time .. ............................. ......... 10 minutes Operating environment Ambient temperature ..................... . 0 to 50 ° C Humidity ............ ..[...]

  • Page 24

    Appendix A Specifications NI 5620 User Manual A-6 Electromagnetic Compatibility CE, C-Tick, and FCC Part 15 ( Class A) compliant Electrical emissions .................... ............EN 55011 Class A at 10 m FCC Part 15A above 1 GHz Electrical immunity .......................... ......E valuated to EN 61326:1997/A1:19 98, Table 1 Note For fu[...]

  • Page 25

    © National Instruments Corporatio n B- 1 NI 5620 User Manual B T echnical Support Resources W eb Support National Instruments W eb support is your first stop for help in solving installation, configuration, and application pro blems and questions. O nline problem-solving and di agnostic resources include frequ ently asked questions, knowledge base[...]

  • Page 26

    Appendix B T echnical Support R esources NI 5620 User Manual B-2 W orldwide Support National Instruments has of fices located around the world to help address your support needs. Y ou can access our branc h of fice W eb sites from the W o rldwide Of fices section of . Branch off ice W eb sites provide up-to-date contact information, s[...]

  • Page 27

    © National Instruments Corporatio n G-1 NI 5620 User Manual Glossar y Pref ix Meanings V alue p- pico 10 – 12 n- nano- 10 – 9 µ- micro- 10 – 6 m- milli- 10 – 3 k- kilo- 10 3 M- mega- 10 6 G- giga- 10 9 Numbers/Symbols % percent + positiv e of, or pl us – negati ve of, or minus /p e r ° degree ± plus or minus Ω ohm < less than A A[...]

  • Page 28

    Glossary NI 5620 User Manu al G-2 © National Instruments Cor poration A C coupled allowing the transmission of A C signals while blocking DC signals ADC analog-to-digital con verter — an electronic device, often an i ntegrated circuit, that con verts an analog voltage to a digital number ADC resolution the resolution of the ADC, which is measure[...]

  • Page 29

    Glossary © National Instruments Corporatio n G-3 NI 5620 User Manual CMRR common-mode rejection ratio — a measure of an instrument ’ s ability to reject interference from a common-mode signal, usually e xpressed in decibels (dB) coupling the manner in which a signal is connected from one location to another D data path logic a signal router dB[...]

  • Page 30

    Glossary NI 5620 User Manu al G-4 © National Instruments Cor poration dr i v er s software that control s a specific hardware instrument DSP digital signal processo r E EEPR OM electrically erasable programmable read-only memory — R OM that can be erased with an electrical signal and reprogrammed F FFT fast F ourier transform filtering a type of[...]

  • Page 31

    Glossary © National Instruments Corporatio n G-5 NI 5620 User Manual input bias current the current that flows into the inputs of a circuit input impedance the measured resistance an d capacitance between the input terminal s of a circuit instrument driv er a set of high-lev el software functio ns that controls a specific plug-in D A Q board. Inst[...]

  • Page 32

    Glossary NI 5620 User Manu al G-6 © National Instruments Cor poration N noise an undesirable electrical signal — Noise comes from e xternal sources such as the A C power line, motors, generators, transformers, fl uorescent lights, soldering irons, CR T displays, computers, electrical storms, welders, radio transmitters, and internal sources such[...]

  • Page 33

    Glossary © National Instruments Corporatio n G-7 NI 5620 User Manual random interleav ed sampling method of increasing sample rate b y repetitiv ely sampling a repeated wav eform real-time sampling sampling that occurs immediately record length the size of a chunk (or record) of data that can be or has been acquired b y a de v ice resolution the s[...]

  • Page 34

    Glossary NI 5620 User Manu al G-8 © National Instruments Cor poration T temperature coef ficient the percentage that a measurement will v ary according to temperature. See also t h er m a l d r i f t . thermal drift measurements that change as the temperature varies thermal EMFs thermal electromoti ve forces — voltages generated at the junction [...]

  • Page 35

    Glossary © National Instruments Corporatio n G-9 NI 5620 User Manual W wa veform shap e the shape the magni tude of a signal creates ov er ti me working voltage the hi ghest voltage that should be applied to a product in norm al use, normally well under the breakdown v oltage for safety margin[...]

  • Page 36

    © National Instruments Corporatio n I-1 NI 5620 User Manual Index A AC coupling, 2-3 acquiring data multiple-record acqui sitions, 2-6 programmatically, 1-2 ADC, 2-3 amplitude specifications, A-2 to A- 3 B basic signal flow (fi gure), 2-1 block diagram for NI 5620 digitizer, 2-5 to 2-6 C calibration, 2-7 certifications and compliances, A-6 conditi[...]

  • Page 37

    Index NI 5620 User Manual I- 2 signal path from NI 5620 to host computer, 2-1 storing data in memory, 2-4 synchronizing multiple PXI d evices, 2-8 triggering, 2-7 I incorporating DDC, 2-4 input impedance, 2-3 input specifications, A-1 to A-2 installing software and har dware, 1-1 M maximum working vo ltage, A-5 MITE interface, 2-6 multiple-r[...]

  • Page 38

    Index © National Instruments Corporatio n I-3 NI 5620 User Manual system integration, by Natio nal Instrument s, B-1 System Reference Clock, PXI, 2-9 T technical support resources, B-1 to B-2 TIO (timing engine), 2-6 trigger and clock routing area, 2-6 triggering digital trigger sources (figure), 2 -7 overview, 2-7 specifications, A-4 V voltage, m[...]