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National Instruments BNC-2140 manual

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Table of contents for the manual

  • Page 1

    DAQ BNC-2140 User Manual Dynamic Signal Acquisition Signal Conditioning Accessory BNC-2140 User Manual June 1998 Edition Part Number 3219 33B-01 UM.book Page 1 Tuesday, July 14, 1998 10:37 AM[...]

  • Page 2

    Internet Support E-mail: s upport@natinst.com FTP Site: ftp.natinst.com Web Address: http://www.natinst.com Bulletin Board Support BBS United States: 512 794 5422 BBS United Kingdom: 01635 551422 BBS France: 01 48 65 15 59 Fax-on-Demand Support 512 418 1111 Telephone Support (USA) Tel: 512 795 8248 Fax: 512 794 5678 International Offices Australia [...]

  • Page 3

    Important Information Warranty The BNC-2140 i s warranted agains t defects in materi als and workmanship for a period of one year from the dat e of shipment, as evidenced by receipts or other documentati on. National Instruments will, at its option, repair or replace equipment that pro ves to be d efective duri ng th e warrant y pe riod. This warra[...]

  • Page 4

    © National Instruments Corporation v BNC-2140 User Manual Contents About This Manual Organization of This Manual .............. ........... .............. ............... .............. .............. ....... vii Conventions Used in This Manual .......................... ........... .............. .............. .............. .. viii Related Docu[...]

  • Page 5

    Contents BNC-2140 User Manual vi © National Instruments Corporation Power Requirement (from DSA board) .......... .............. .............. ........... ......... A-2 Physical .. .............. .............. ............... .............. ........... .............. .............. ......... A-2 Environment .................. .............. ....[...]

  • Page 6

    © National Instruments Corporation vii BNC-2140 User Manual About This Manual This manual describes the electrical and mechanical aspects of the BNC-2140 accessory and contains information concerning its operation. Organization of This Manual The BNC-2140 User Manual is organized as follows: • Chapter 1, Introduction , describes the BNC-2140 acc[...]

  • Page 7

    About This Manual BNC-2140 User Manual viii © National Instruments Corporation Conventions Used in This Manual The following con ventions are used in this manual: < > Angle brackets containing numbers separated b y an ellipsis represent a range of v alues associated with a bit or signal name—for e xample, DIO<3..0>. This icon to the [...]

  • Page 8

    © National Instruments Corporation 1-1 BNC-2140 User Manual 1 Introduction This chapter describes the BNC-2140 accessory, lists what you need to get started, explains how to unpack your BNC-2140, and describes optional equipment. Thank you for buying the BNC-2140 accessory for DSA.The BNC-2140 is a signal conditioning accessory specifically design[...]

  • Page 9

    Chapter 1 Introduction BNC-2140 User Manual 1-2 © National Instruments Corporation What Y ou Need to Get Started To set up and use your BNC-2140 device, you will need the following: ❑ BNC-2140 ❑ One of the follo wing DSA de vices: PCI-4451 PCI-4452 NI 4551 NI 4552 ❑ BNC-2140 User Manual ❑ Y our co mp uter ❑ SHC68-C68-A1 analog cable Unpa[...]

  • Page 10

    Chapter 1 Introduction © National Instruments Corporation 1-3 BNC-2140 User Manual If your application requires that you use a prepolarized microphone with a microphone preamplifier , contact Brüel and Kjær . Custom Cabling National Instruments offers cables of different lengths for the BNC-2140 accessory to connect your analog I/O signals to th[...]

  • Page 11

    © National Instruments Corporation 2-1 BNC-2140 User Manual 2 Installation and Configuration This chapter explains how to install and configure your BNC-2140 accessory. Installation Note Y ou must turn the power of f to your computer before installing the BNC-2140. The following are general inst allation instruct ions. 1. Insert either end of your[...]

  • Page 12

    Chapter 2 Installation and Configuration BNC-2140 User Manual 2-2 © National Instruments Corporation Figure 2-1. Switch Settings and Signal Connections ® UM.book Page 2 Tuesday, July 14, 1998 10:37 AM[...]

  • Page 13

    © National Instruments Corporation 3-1 BNC-2140 User Manual 3 Signal Connections This chapter describes how to connect input and output signals to your BNC-2140. Y ou can connect the external analog signals through six BNC connectors. Four BNC connectors are for input signals and two connectors are for output signals. The SHC68-C68-A1 shielded cab[...]

  • Page 14

    Chapter 3 Signal Connections BNC-2140 User Manual 3-2 © National Instruments Corporation +D AC1OUT –D A C1O UT Output +An alog Output Channel 1—This pin supplies the analog non-in verting output channel 1. This signal passes through the internal BNC co nductor . – DAC 1 O U T + DAC 1 O U T Output –Analog Outp ut Channel 1 — This pin supp[...]

  • Page 15

    Chapter 3 Signal Connections © National Instruments Corporation 3-3 BNC-2140 User Manual Figure 3 -1 describes the pin connections on the BNC-2140 68-pin connector . Figure 3-1. BNC-2140 External 68-Pin Analog Connector DGND +5 V NC NC NC NC AOGND † –DAC1OUT AOGND † –DAC0OUT NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC NC AIGND † –ACH3[...]

  • Page 16

    Chapter 3 Signal Connections BNC-2140 User Manual 3-4 © National Instruments Corporation Note This BNC-2140 pin assignment maps to the pin assignment of the DSA device you are connecting to the BNC-2140. Refer to your DSA device user manual for the pin assignments specific to your device connection. T able 3-2 shows the pin assignments for the int[...]

  • Page 17

    Chapter 3 Signal Connections © National Instruments Corporation 3-5 BNC-2140 User Manual The outer shell of the BNC connectors is not GND (0 V). The outer shell of the BNC is not physically connected to the metal box of the BNC-2140. The outer shell is either the in verting dif ferential signal in DIFF mode or is tethered to GND (0 V) through a 50[...]

  • Page 18

    © National Instruments Corporation 4-1 BNC-2140 User Manual 4 Theor y of Operation This chapter contains a functional overview of the BNC-2140. UM.book Page 1 Tuesday, July 14, 1998 10:37 AM[...]

  • Page 19

    Chapter 4 Theory of Operation BNC-2140 User Manual 4-2 © National Instruments Corporation Functional Over view Figure 4 -1 is a block diagram of the BNC-2140. Figure 4-1. BNC-2140 Block Diagram 0 +5 V +30 V ICP CH0 Isolated P ower Supply ICP Current Source 0 ICP Enable on/off AICH0 BNC Connector DIFF/SE 50 Ω AICH0+ AICH0– AIGND 3 +5 V +30 V IC[...]

  • Page 20

    Chapter 4 Theory of Operation © National Instruments Corporation 4-3 BNC-2140 User Manual Analog Input Circuitr y The BNC-2140 has four identical analog input channels. A principal function of the BNC-2140 is to supp ly a constant curren t for ICP type accelerometers and microphone preamplif iers. Many accelerometers use piezoelectric materials to[...]

  • Page 21

    Chapter 4 Theory of Operation BNC-2140 User Manual 4-4 © National Instruments Corporation Analog Output The BNC-2140 has two an alog output channels. The BNC-2140 can also select between DIFF and SE outputs. In DIFF mode, one line connects to the positi ve output of the channel and the other connects to the negati ve output of that same channel. Y[...]

  • Page 22

    © National Instruments Corporation A-1 BNC-2140 User Manual A Specifications This appendix lists the specif ications of the BNC-2140 accessory . All specifications are typical at 25° C unless otherwise noted. All specif ications are relati ve to measurement standards and require a 15 minute warm-up period. Specifications do not include transducer[...]

  • Page 23

    Appendix A Specifications BNC-2140 User Manual A-2 © National Instruments Corporation Temperature coefficient ........... .............. .±141 ppm/° C Voltage compliance ............ .............. ......24 V Excitation overvoltage protection ........... ±42.4 V (30 V rms ) powered on or off Analog Output Number of channels ....................[...]

  • Page 24

    © National Instruments Corporation B-1 BNC-2140 User Manual B Customer Communication For your con venience, this appendix contains forms to help you gather the information necessary to help us solv e yo ur technical problems and a form you can use to comment on the product documentation. When you contact us, we need the information on the T echnic[...]

  • Page 25

    BNC-2140 User Manual B-2 © National Instruments Corporation Fax-on-Demand Support Fax-on-Demand is a 24-hour information retrie val system containing a library of documents on a wide range of technical information. Y ou can access Fax-on-Demand from a touch-tone telephone at 512 418 1111. E-Mail Support (Currently USA Only) Y ou can submit technic[...]

  • Page 26

    T echnical Support Form Photocopy this form and update it each time you mak e changes to your software or hardware, and use the completed copy of this form as a reference for your current conf iguration. Completing this form accurately before contacting National Instruments for technical support helps our applications engineers answer your question[...]

  • Page 27

    Documentation Comment Form National Instruments encourages you to comment on the documentation supplied with our pro ducts. This information helps us provide quality products to meet your needs. Title: BNC-2140 User Manual Edition Date: June 1998 Part Number: 321933B-01 Please comment on the completeness, clarity , and organization of the manual. _[...]

  • Page 28

    © National Instruments Corporation G-1 BNC-2140 User Manual Glossar y Pref ix Meanings V alue p- pico 10 –1 2 n- nano- 10 –9 µ- micro- 10 –6 m- milli- 10 –3 k- kilo- 10 3 M- mega- 10 6 G- giga- 10 9 t- tera- 10 12 Numbers/Symbols % percent + positi ve of, or plus – negati ve of, or minus /p e r °d e g r e e Ω ohm +5 V +5 V VDC source[...]

  • Page 29

    Glossary BNC-2140 User Manual G-2 © National Instruments Corporation A CH a nalo g input channel signal A/D analog-to-digital ADC analog-to-digital conv erter—an electronic device, often an integrated circuit, that con verts an analog voltage to a digital number alias a false lo wer frequency component that appears in sampled data acquired at to[...]

  • Page 30

    Glossary © National Instruments Corporation G-3 BNC-2140 User Manual C C Celsius channel pin or wire lead to which you apply or from which you read the analog or digital signal. Analog signals can be single-ended or differential. F or digital signals, you group channels to form ports. Ports usually consist of either four or eight digital channels.[...]

  • Page 31

    Glossary BNC-2140 User Manual G-4 © National Instruments Corporation D D/A digital-to-analog D AC digital-to-analog conv erter—an electronic de vice, often an integrated circuit, that con verts a digital number into a correspond ing analog voltage or current D AC0OUT analog channel 0 outpu t signal D AC1OUT analog channel 1output signal dB decib[...]

  • Page 32

    Glossary © National Instruments Corporation G-5 BNC-2140 User Manual DNL differential nonlinearity—a measure in lea s t s ig n i f ic a n t b i t of the worst-case de viation of code widths from their ideal value of 1 LSB dynamic range the ratio of the largest signal le vel a circuit can handle to the smallest signal lev el it can handle (usuall[...]

  • Page 33

    Glossary BNC-2140 User Manual G-6 © National Instruments Corporation I IC integrated circuit ICP Integrated Circuit Piezoelectric—identif ies products that operate using a constant current source and returns the output signal in the form of v oltage modulation on the same line as the constant current source. IMD intermodulation d istortion—the[...]

  • Page 34

    Glossary © National Instruments Corporation G-7 BNC-2140 User Manual K k kilo—the standard metric prefix for 1,000, or 10 3 , used with units of measure such as volts, hertz, and meters K kilo—the prefix for 1,024, or 2 10 , used with B in q uantifying data or computer memory kS 1,000 samples L LabVIEW laboratory virtual instrument engineering[...]

  • Page 35

    Glossary BNC-2140 User Manual G-8 © National Instruments Corporation N NC normally closed, or n ot connected NIST National Institute of Standards and T echnology noise an undesirable electrical signal—N oise comes fro m external sources such as the A C power line, motors, generators, transformers, fluorescent lights, soldering irons, CR T displa[...]

  • Page 36

    Glossary © National Instruments Corporation G-9 BNC-2140 User Manual peak to peak a measure of signal amplitude; the difference between the highest and lowest e xcursions of the signal pF pico farad—a farad is a unit used to measure capacitance ppm parts per million pts points R relati ve accurac y a measure in LSB of the accuracy of an ADC. It [...]

  • Page 37

    Glossary BNC-2140 User Manual G-10 © National Instruments Corporation Shannon Sampling Theorem a law of sampling theory stating that if a continuous bandwidth-limited signal contains no frequency components higher than half the frequency at which it is sampled, then the original signal can be recov ered without distortion SNR signal-to-noise rati [...]

  • Page 38

    Glossary © National Instruments Corporation G-11 BNC-2140 User Manual V Vv o l t s V DC volts direct current V IH volts, input high V IL volts, input lo w V in volts in V OH volts, output high V OL volts, output lo w V ref reference voltage W wa veform multiple v oltage readings taken at a specific sampling rate working v oltage the highest voltag[...]

  • Page 39

    © National Instruments Corporation I-1 BNC-2140 User Manual Index Numbers +5 V signal, 68-pin connector signal descriptions (table), 3-4 A +A CH<0..3> signal 68-pin connector signal description s (table), 3-4 analog connector (table), 3-1 analog input signal connections, 3-5 –A CH<0..3> signal 68-pin connector signal description s (t[...]

  • Page 40

    Index BNC-2140 User Manual I-2 © National Instruments Corporation analog output signal connections, 3-5 DGND signal, 68-pin connector signal descriptions (table), 3-4 DIFF configuration analog input circuitry , 4-3 analog input signal connections, 3-5 analog output, 4-4 analog output signal connections, 3-5 setting, 2-1 to 2-2 documentation con ve[...]

  • Page 41

    Index © National Instruments Corporation I-3 BNC-2140 User Manual signal connections, 3-1 to 3 -5 analog input, 3-5 analog output, 3-5 I/O connectors, 3-1 to 3-5 68-pin connector signal description s (table), 3-4 analog connector signal descriptions ( t a b l e ) , 3 - 1t o3 - 2 exceedi n g maxi mum rat ings (caution) , 3- 4 to 3-5 pin connections[...]