National Instruments SCXI -1122 manual

© 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[...]

Worldwide T echn ical Supp ort an d Produ ct Infor matio n www.natinst.com Nati onal In strument s Corp orate He adquar ters 11500 Nor th Mopac Exp ressway Austin, T exas 78759- 3504 USA T el: 512 794 01 00 Wo rldwide O ffices Aus tralia 03 987 9 5166, Au stria 0 662 45 79 90 0, Belgium 02 75 7 00 20, Brazil 011 284 50 11, Cana da (Calg ary) 40 3 2[...]

Warranty T h e SCX I - 1 1 2 2 is war r a n t e d ag a inst d e f ect s i n m ate ri a l s a n d w or k m a nshi p f o r a p e ri o d o f o n e yea r f r o m t h e d ate o f shipm e nt, as evidenced by receipt s or other document a tion. National Instrument s will, at its option, rep a ir or replace equipm e nt that prov e s to be defective duri ng[...]

WARNING REGARDING USE OF NATIONAL INSTRUMENTS PRODUCTS (1) NATIONAL INSTRUMENTS PRODUC TS ARE NOT DESIGNED WITH COMPONENTS AND TESTING FOR A LEVEL OF R ELIABILITY SUI TABLE FOR USE IN O R IN CONNECTION WITH S URGICAL IMPLANTS OR AS CRITICAL COMPONENTS IN ANY LIFE SUPPORT SYSTEMS W HOSE FAILURE TO PERFORM CAN REASONABL Y BE EXPECTED TO C AUSE SIGNIF[...]

© National Instruments Corporation v SCXI-1122 User Manual Contents About This Manual ............................................................................................................. ix Organization of This Manual ......................................................................................... ix Conventions Used in This Manu[...]

Contents SCXI-1122 User Manual vi © National Instruments Corporation Chapter 5 Calibration ............................................................................................................................. 5-1 Overview .......................................................................................................................[...]

Contents © National Instruments Corporation vii SCXI-1122 User Manual Figures Figur e 1-1. The Relationship between the Programming Environment, NI-DAQ, and Your Hardwar e .................................................................................................. . 1-3 Figur e 2-1. SCXI-1122 Parts Locator Diagra m ..........................[...]

© 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 Instrumentation (SCXI) Series for the National Instr[...]

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 to a key concept. Lab board Lab board refers to [...]

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: • Getting Started with SCXI –This is the first manu[...]

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 them. To make it easy for you to contact us, this m[...]

© 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 isolated input channels and two isolated excitatio[...]

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 programming software. LabVIEW and LabWindows Application[...]

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 different versions so that you can change platforms[...]

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 inefficient, and is not recommended for most users. [...]

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) The mating connector for the SCXI-1122 rear sign[...]

© 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 parts locator diagram in Figure 2-1. Jumper W2 conn[...]

Configuration and Installation Chapter 2 SCXI-1122 User Manual 2-2 © National Instruments Corporation Figure 2-1. SCXI-1122 Parts Locator Diagram[...]

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 between the DAQ board and the SCXIbus, shown in Tab[...]

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 to the analog output ground AOGND (pins 1 and 2 [...]

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 4R 5 5R 6 6R 7 7R 8 8R 9 9 R10 10 R11 11 R12 12 R13 13 R14 14 R17 15 R18 Warning: Before installing the resistors in your module, make sure[...]

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 Appendix B, Customer Communication , you are ready [...]

© 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 instructions for the signals on the SCXI -1122 conne[...]

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, and the SCXI-1122 module. National Instruments[...]

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. ! I f a relay fails there exists a potential shock hazard on the inputs that are not in contact with hazardous voltages. For this reason treat all inputs as potentially h[...]

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 negative input in the module. A3 TEMP+ Temperatu[...]

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. Signal connection guidelines for each of these group[...]

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. Floating AC-Coupled Signal Connection Referenced to C[...]

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 the DC path for the positive input bias current. [...]

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? Ye s average the samples for each channel CH0 x 100 samples CH1 x 100 samples CH2 x 100 samples CH3 x 100 samples average the samples for each channel a [...]

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 and quarter-bridge setups. The completion network[...]

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 feedthrough panel, the SCXI-1343 rear screw terminal ad[...]

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 Channels 0–Connects to the DAQ board differen[...]

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 are configured for referenced single-ended (RSE) me[...]

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 DOUT5 INTR* SLOT0SEL* ADIO2 PB6 DOUT6 SPICLK SER[...]

© 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 the key functional components of the SCXI -1122.[...]

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 +1 AB0 Switch AB0+ AB0- MCH0+ MCH0- AB0 Cont[...]

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 of 16 isolated multiplexed channels with[...]

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 lower channels (8 through 15) operate as current [...]

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 input channel–have a 480 Vrms common-mode vo[...]

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 thermistors and RTDs–which need a current excitatio[...]

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. Pros and Cons of Two-Wire and Four-Wire Connections [...]

© 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 channel on the amplifier input selector. When the [...]

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 need an ammeter with the following specificat[...]

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 measured value. c. Measure the SCXI-1122 output wit[...]

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 software user manual for how to use the SCXI_Cal_C[...]

© 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 2 5 ° C unless otherwise stated. Analog Input Input Characteristics Number of channels 16 differential, 8 4-wire, software selectable Input signal ranges Module Gain Max Module Rang[...]

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 < 1 ± (352 µ V + 1,240 µ V/gain) Gain error Gain ≥ 1 ± 0.02% of reading Gain < 1 ± 0.10% of reading Amplifier Characteristics Input impedance [...]

° 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% Current drive 225 mA Drift 30 ppm/ ° C Current M[...]

© National Instruments Corporation B- 1 SCXI-112 2 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 documentation. Filling out a copy of the Technica[...]

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 contacting National Instruments for technical support help[...]

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. Completing this form accurately before contacting[...]

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 indicate your reasons for obtaining the register-level pr[...]

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-112 2 User Manual Edition Date: September 1999 Part Number: 320516B-01 Please comment on the completeness, clarity, and organization of the manu[...]

© 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 Ω ohms % percent ± plus or minus[...]

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 voltage D D/A digital-to-analog DAQD*/A Data Acquisitio[...]

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-In-Slave-Out signal MOSI Master-Out-Slave-In signa[...]

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-noise ratio SPICLK Serial Peripheral Interface Clock[...]

© 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 4-7 analog configuration, 2-3 to 2-5 current-loop [...]

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 protection, 3-8 excitation level, 3-8 to 3-9 internal h[...]

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 Register, 2-3, 4-3 N NI-DAQ driver software, 1-2 to [...]

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 assignments (illustration), 3-3 signal connection desc[...]