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National Instruments SCXI-1122 User Manual
Summary of SCXI-1122
Page 1
© copyright 1993, 1999 national instruments corporation. All rights reserved. User manual sixteen-channel isolated transducer multiplexer module for signal conditioning september 1999 edition part number 320516b-01 scxi -1122 tm.
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Worldwide technical support and product information www.Natinst.Com 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, ca...
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Warranty the scxi-1122 is warranted against defects in materials and workmanship for a period of one year from the date of shipment, as evidenced by receipts or other documentation. National instruments will, at its option, repair or replace equipment that proves to be defective during the warranty ...
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Warning regarding use of national instruments products (1) national instruments products are not designed with components and testing for a level of reliability suitable for use in or in connection with surgical implants or as critical components in any life support systems whose failure to perform ...
Page 5: Contents
© national instruments corporation v scxi-1122 user manual contents about this manual ............................................................................................................. Ix organization of this manual ............................................................................
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Contents scxi-1122 user manual vi © national instruments corporation chapter 5 calibration ............................................................................................................................. 5-1 overview .........................................................................
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Contents © national instruments corporation vii scxi-1122 user manual figures figure 1-1. The relationship between the programming environment, ni-daq, and your hardware................................................................................................... 1-3 figure 2-1. Scxi-1122 parts...
Page 8: About This Manual
© national instruments corporation ix scxi-1122 user manual about this manual this manual describes the electrical and mechanical aspects of the scxi-1122 and contains information concerning its operation. The scxi-1122 is a member of the national instruments signal conditioning extensions for instr...
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About this manual scxi-1122 user manual x © national instruments corporation conventions used in this manual the following conventions are used in this manual. Bold italic bold italic text denotes a note, caution, or warning. Italic italic text denotes emphasis, a cross reference, or an introduction...
Page 10: Related Documentation
About this manual © national instruments corporation xi scxi-1122 user manual the national instruments documentation set the scxi-1122 user manual is one piece of the documentation set for your scxi system. You should have six types of manuals. Use these different types of manuals as follows: • gett...
Page 11: Customer Communication
About this manual scxi-1122 user manual xii © national instruments corporation customer communication national instruments wants to receive your comments on our products and manuals. We are interested in the applications you develop with our products, and we want to help if you have problems with th...
Page 12: Chapter 1
© national instruments corporation 1-1 scxi-1122 user manual chapter 1 introduction this chapter describes the scxi-1122; lists the contents of your scxi-1122 kit; describes the optional software, optional equipment, and custom cables; and explains how to unpack the scxi-1122. The scxi-1122 has 16 i...
Page 13: Software Programming Choices
Introduction chapter 1 scxi-1122 user manual 1-2 © national instruments corporation software programming choices there are four options to choose from when programming your national instruments plug-in daq board and scxi hardware. You can use labview, labwindows, ni-daq, or register- level programmi...
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Chapter 1 introduction © national instruments corporation 1-3 scxi-1122 user manual ni-daq also internally addresses many of the complex issues between the computer and the plug-in board such as programming interrupts and dma controllers. Ni-daq maintains a consistent software interface among its di...
Page 15: Optional Equipment
Introduction chapter 1 scxi-1122 user manual 1-4 © national instruments corporation register-level programming the final option for programming any national instruments daq hardware is to write register- level software. Writing register-level programming software can be very time consuming and ineff...
Page 16: Unpacking
Chapter 1 introduction © national instruments corporation 1-5 scxi-1122 user manual custom cables the scxi-1122 rear signal connector is a 50-pin male ribbon-cable header. The manufacturer part number that national instruments uses for this header is as follows: • amp inc. (part number 1-103310-0) t...
Page 17: Chapter 2
© national instruments corporation 2-1 scxi-1122 user manual chapter 2 configuration and installation this chapter describes how to configure the scxi-1122 jumpers and how to install the scxi-1122 into the scxi chassis. Module configuration the scxi-1122 contains two jumpers that are shown in the pa...
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Configuration and installation chapter 2 scxi-1122 user manual 2-2 © national instruments corporation figure 2-1. Scxi-1122 parts locator diagram.
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Chapter 2 configuration and installation © national instruments corporation 2-3 scxi-1122 user manual digital signal connections note: if nothing is cabled to the scxi-1122 rear signal connector, the position of jumper w2 is irrelevant. The scxi-1122 has one jumper–jumper w2–for communication betwee...
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Configuration and installation chapter 2 scxi-1122 user manual 2-4 © national instruments corporation table 2-2. Jumper w1 settings jumper description configuration grounding, shielding, and reference mode selection unconnected position (factory setting) w1 b a r0 r1 r2 connects the analog reference...
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Chapter 2 configuration and installation © national instruments corporation 2-5 scxi-1122 user manual table 2-3. User-defined current receiver resistors (continued) input channel resistor reference designator 4 r5 5 r6 6 r7 7 r8 8 r9 9 r10 10 r11 11 r12 12 r13 13 r14 14 r17 15 r18 warning: before in...
Page 22: Hardware Installation
Configuration and installation chapter 2 scxi-1122 user manual 2-6 © national instruments corporation hardware installation you can install the scxi-1122 in any available scxi chassis slot. After you have made any necessary changes and have verified and recorded the jumper settings on the form in ap...
Page 23: Chapter 3
© national instruments corporation 3-1 scxi-1122 user manual chapter 3 signal connections this chapter describes the input and output signal connections to the scxi-1122 module via the scxi-1122 front connector and rear signal connector. This chapter also includes specifications and connection instr...
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Signal connections chapter 3 scxi-1122 user manual 3-2 © national instruments corporation connections, including power signals to ground and vice versa, that exceed any of the maximum signal ratings on the scxi-1122 can damage any or all of the boards connected to the scxi chassis, the host computer...
Page 25: Front Connector
Chapter 3 signal connections © national instruments corporation 3-3 scxi-1122 user manual front connector figure 3-1 shows the pin assignments for the scxi-1122 front connector. ! If a relay fails there exists a potential shock hazard on the inputs that are not in contact with hazardous voltages. Fo...
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Signal connections chapter 3 scxi-1122 user manual 3-4 © national instruments corporation front signal connection descriptions pin signal name description a1 temp- temperature sensor reference–this pin is tied to the temperature sensor reference in the terminal block and to the isolation amplifier n...
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Chapter 3 signal connections © national instruments corporation 3-5 scxi-1122 user manual the signals on the front connector are all analog except pins a7, and a31, which are digital. The analog signals are grouped into analog input channels, excitation channels, and temperature sensor signals. Sign...
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Signal connections chapter 3 scxi-1122 user manual 3-6 © national instruments corporation vs vcm + - figure 3-2. Ground-referenced signal connection with high common-mode voltage vs + - figure 3-3. Floating signal connection referenced to chassis ground for better snr vs r b c c + - figure 3-4. Floa...
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Chapter 3 signal connections © national instruments corporation 3-7 scxi-1122 user manual vs r b c c vcm + - figure 3-5. Ac-coupled signal connection with high common-mode voltage for ac-coupled signals, connect an external resistor from the positive input channel to the signal reference to provide ...
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Signal connections chapter 3 scxi-1122 user manual 3-8 © national instruments corporation scanned 100 times ch0 (one sample) ch1 (one sample) ch2 (one sample) ch3 (one sample) no 100 scans done? Yes average the samples for each channel ch0 x 100 samples ch1 x 100 samples ch2 x 100 samples ch3 x 100 ...
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Chapter 3 signal connections © national instruments corporation 3-9 scxi-1122 user manual table 3-1. Maximum load per excitation channel excitation level maximum load 3.333 v 225 ma 1 ma 5 k Ω using the internal half-bridge completion your scxi-1122 includes half-bridge completion for half-bridge an...
Page 32: Rear Signal Connector
Signal connections chapter 3 scxi-1122 user manual 3-10 © national instruments corporation rear signal connector note: if you are using the scxi-1122 with a national instruments daq board and cable assembly, you do not need to read the remainder of this chapter. If you are using the scxi-1180 feedth...
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Chapter 3 signal connections © national instruments corporation 3-11 scxi-1122 user manual rear signal connection descriptions pin signal name description 1, 2 aognd analog output ground–these pins are connected to the analog reference when jumper w1 is in position ab-r0. 3, 4 mch0 ± analog output c...
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Signal connections chapter 3 scxi-1122 user manual 3-12 © national instruments corporation in particular, when using differential input daq boards such as the mio-16 boards, it is preferable to leave jumper w1 in its factory setting or in position ab-r1 to avoid ground loops. With daq boards that ar...
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Chapter 3 signal connections © national instruments corporation 3-13 scxi-1122 user manual table 3-2. Scxibus to scxi-1122 rear signal connector to daq board pin equivalences scxibus line scxi-1122 rear signal connector mio-16 lab boards pc-lpm-16 mosi serdatin adio0 pb4 dout4 d*/a daqd*/a adio1 pb5...
Page 36: Chapter 4
© national instruments corporation 4-1 scxi-1122 user manual chapter 4 theory of operation this chapter contains a functional overview of the scxi-1122 module and explains the operation of each functional unit making up the scxi-1122. Functional overview the block diagram in figure 4-1 illustrates t...
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Theory of operation chapter 4 scxi-1122 user manual 4-2 © national instruments corporation iex+ iex- vex+ vex/2 vex- current source v oltage source configuration register lpf-sel amplifier input selector control gain status register digital control & interface rear signal connector scxibus connector...
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Chapter 4 theory of operation © national instruments corporation 4-3 scxi-1122 user manual the major components of the scxi-1122 are as follows: • the rear signal connector • the scxibus connector • the scxibus interface • the digital control circuitry • the analog circuitry the scxi-1122 consists o...
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Theory of operation chapter 4 scxi-1122 user manual 4-4 © national instruments corporation banks which switch synchronously. The eight upper channels (0 through 7) operate as voltage sense channels and one out of eight is connected to the amplifier at any given point in time. In addition, the eight ...
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Chapter 4 theory of operation © national instruments corporation 4-5 scxi-1122 user manual excitation output channels in addition to the isolated input channels, the scxi-1122 has isolated excitation channels, one 3.333 v voltage output source and one 1 ma current output source. Both–like the relay ...
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Theory of operation chapter 4 scxi-1122 user manual 4-6 © national instruments corporation gauge resistor–to complete the bridge network. Connect this resistor in your scxi-1322 terminal block between the ch+ and vex- terminals. The current output channel is provided for transducers–such as thermist...
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Chapter 4 theory of operation © national instruments corporation 4-7 scxi-1122 user manual note: always connect the current excitation terminals outside the sense terminals as shown in both figures 4-2 and 4-3. Each approach has its advantages and disadvantages as listed in table 4-2. Table 4-2. Pro...
Page 43: Chapter 5
© national instruments corporation 5-1 scxi-1122 user manual chapter 5 calibration this chapter discusses the calibration procedures for the scxi-1122. Overview the onboard calibration hardware that calibrates the scxi-1122, consists of an eeprom to store the calibration constants and an auto-zero c...
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Calibration chapter 5 scxi-1122 user manual 5-2 © national instruments corporation - resolution 8 1 / 2 digits • for the excitation channels, you need a voltmeter with the following specifications: - accuracy ± 0.004% standard ± 0.16% sufficient - range 0 to +5 v - resolution 5 1 / 2 digits • you ne...
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Chapter 5 calibration © national instruments corporation 5-3 scxi-1122 user manual • to select positive and negative full scale to be the two calibration points, apply -9.9 v/g s and 9.9 v/g s. . A. Apply -9.9 v/g s to the amplifier input. B. Measure the input voltage with the dmm and store the meas...
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Calibration chapter 5 scxi-1122 user manual 5-4 © national instruments corporation excitation calibration when using the excitation channels, you must retrieve the correction factors for the current and voltage from the eeprom before using them in your transducer conversion formulas. Refer to your s...
Page 47: Appendix A
© national instruments corporation a-1 scxi-1122 user manual appendix a specifications this appendix lists the specifications for the scxi-1122. These are typical at 25 ° cunless otherwise stated. Analog input input characteristics number of channels 16 differential, 8 4-wire, software selectable in...
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Specifications appendix a scxi-1122 user manual a-2 © national instruments corporation transfer characteristics nonlinearity 0.01% fsr offset error gain ≥ 1 ± (6 µ v + 1,240 µ v/gain) gain ± (352 µ v + 1,240 µ v/gain) gain error gain ≥ 1 ± 0.02% of reading gain ± 0.10% of reading amplifier character...
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° appendix a specifications © national instruments corporation a-3 scxi-1122 user manual excitation output characteristics channels 2 (1 voltage and 1 current) bridge type quarter, half, or full bridge completion two 2.5 k Ω ± 0.02% ratio tolerance resistors voltage mode level 3.333 v ± 0.04% curren...
Page 50: Appendix B
© national instruments corporation b-1 scxi-1122 user manual appendix b customer communication for your convenience, this appendix contains forms to help you gather the information necessary to help us solve technical problems you might have as well as a form you can use to comment on the product do...
Page 51: Technical Support Form
Technical support form ___________________________________________________ photocopy this form and update it each time you make changes to your software or hardware, and use the completed copy of this form as a reference for your current configuration. Completing this form accurately before contacti...
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Scxi-1122 hardware configuration form record the settings and revisions of your hardware and software on the line to the right of each item. Complete a new copy of this form each time you revise your software or hardware configuration, and use this form as a reference for your current configuration....
Page 53: Request Form
Register-level programmer manual request form national instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. Title: scxi-1122 register-level programmer manual part number: 340696-01 please indicat...
Page 54: Documentation Comment Form
Documentation comment form national instruments encourages you to comment on the documentation supplied with our products. This information helps us provide quality products to meet your needs. Title: scxi-1122 user manual edition date: september 1999 part number: 320516b-01 please comment on the co...
Page 55: Glossary
© national instruments corporation glossary-1 scxi-1122 user manual glossary prefix meaning value p- pico- 10 -12 n- nano- 10 -9 µ - micro- 10 -6 m- milli- 10 -3 k- kilo- 10 3 m- mega- 10 6 numbers/symbols ˚ degrees ε strain > greater than ≥ greater than or equal to less than - negative of, or minus...
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Glossary scxi-1122 user manual glossary-2 © national instruments corporation ch#+ positive input channel number signal ch#- negative input channel number signal cjc cold-junction compensation cjr cold-junction reference cjs cold junction sensor cmrr common-mode rejection ratio cmv common-mode voltag...
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Glossary © national instruments corporation glossary-3 scxi-1122 user manual intr* interrupt signal i/o input/output m m meters mb megabytes of memory mch#+ positive analog output channel number signal mch#- negative analog output channel number signal min minutes mio multifunction i/o miso master-i...
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Glossary scxi-1122 user manual glossary-4 © national instruments corporation s seconds sense- negative voltage sense signal sense+ positive voltage sense signal serclk serial clock signal serdatin serial data in signal serdatout serial data out signal slot0sel* slot 0 select signal snr signal-to-noi...
Page 59: Index
© national instruments corporation index-1 scxi-1122 user manual index numbers +5 v signal, 3-4 a ac-coupled signal connection with high common-mode voltage (illustration), 3-7 address handler register, 4-3 analog circuitry, 4-3 to 4-7 analog input channels, 4-3 excitation output channels, 4-3 to 4-...
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Index scxi-1122 user manual index-2 © national instruments corporation e eeprom, 5-1 environment specifications, a-3 equipment, optional, 1-4 to 1-5 excitation channel signal connections, 3-8 to 3-9 connecting quarter-bridge strain gauge to channel 0 (illustration), 3-9 exceeding overvoltage protect...
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Index © national instruments corporation index-3 scxi-1122 user manual m manual. See documentation. Mch0 ± signal, 3-11, 3-12 mio-16 boards scxibus to scxi-1122 rear signal connector to daq board pin equivalences (table), 3-13 miso line, 2-3 module configuration. See configuration. Module id registe...
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Index scxi-1122 user manual index-4 © national instruments corporation ground for better snr (illustration), 3-6 floating signal connection referenced to chassis ground for better snr (illustration), 3-6 ground-referenced signal connection with high common-mode voltage (illustration), 3-6 pin assign...