Scxi -1124 tm © copyright 1994, 1999 national instruments corporation. All rights reserved. User manual six-channel isolated digital-to-analog converter module september 1999 edition part number 320712b-01.
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Warranty the scxi-1124 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 ...
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 ...
© national instruments corporation v scxi-1124 user manual contents ___________________________________________________ about this manual ........................................................................................................... Vii organization of this manual .........................
Contents © national instruments corporation vi scxi-1124 user manual chapter 5 calibration ........................................................................................................................... 5-1 overview ...........................................................................
© national instruments corporation vii scxi-1124 user manual about this manual this manual describes the electrical and mechanical aspects of the scxi-1124 and contains information concerning its installation and operation. The scxi-1124 is one of the national instruments signal conditioning extensi...
About this manual scxi-1124 user manual viii © 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. Dio board dio board refers to the national instruments at-dio-32f, mc-d...
About this manual © national instruments corporation ix scxi-1124 user manual the national instruments documentation set the scxi-1124 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...
About this manual scxi-1124 user manual x © 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...
© national instruments corporation 1-1 scxi-1124 user manual chapter 1 introduction this chapter describes the scxi-1124; lists the contents of your scxi-1124 kit; describes the optional software, optional equipment, and custom cables; and explains how to unpack the scxi-1124. The scxi-1124 has six ...
Introduction chapter 1 scxi-1124 user manual 1-2 © national instruments corporation labwindows enhances traditional programming languages. Both packages include extensive libraries for data acquisition, instrument control, data analysis, and graphical data presentation. Labview currently runs on thr...
Chapter 1 introduction © national instruments corporation 1-3 scxi-1124 user manual labwindows labview (pc or macintosh) conventional programming environment (pc or macintosh) ni-daq driver software data acquisition boards or scxi hardware personal computer figure 1-1. The relationship between the p...
Introduction chapter 1 scxi-1124 user manual 1-4 © national instruments corporation always consider using ni-daq, labview, or labwindows to program your national instruments data acquisition hardware. Using the ni-daq, labview, or labwindows software is easier than, and as flexible as register-level...
Chapter 1 introduction © national instruments corporation 1-5 scxi-1124 user manual custom cables the scxi-1124 rear signal connector is a 50-pin male ribbon-cable header. The manufacturer part number for the header national instruments uses is as follows: • amp inc. (part number 1-103310-0) the mat...
© national instruments corporation 2-1 scxi-1124 user manual chapter 2 configuration and installation this chapter describes the scxi-1124 jumper configurations, installation of the scxi-1124 into the scxi chassis, and cable wiring. Module configuration the scxi-1124 includes four jumpers that are s...
Configuration and installation chapter 2 scxi-1124 user manual 2-2 © national instruments corporation ! S hock hazard –this unit should only be opened by qualified personnel aware of the dangers involved. Disconnect all power before removing the cover. Always install the grounding screw. If signal w...
Chapter 2 configuration and installation © national instruments corporation 2-3 scxi-1124 user manual supplementary jumper configuration information jumper w1, when set to position p, connects a 2.2 k Ω pullup resistor to the serdatout line. An open-collector driver drives the serdatout line. An ope...
Configuration and installation chapter 2 scxi-1124 user manual 2-4 © national instruments corporation notes: cable your daq board to only one module in each chassis. For installation procedures with other scxi accessories and boards, consult your cable installation guide. 6. Check the installation. ...
© national instruments corporation 3-1 scxi-1124 user manual chapter 3 signal connections this chapter describes the signal connections to the scxi-1124 module via the scxi-1124 front connector and via the rear signal connector, and includes specifications and connection instructions for the scxi-11...
Signal connections chapter 3 scxi-1124 user manual 3-2 © national instruments corporation 60 ºc for measuring 250 v. Prepare your signal wire by stripping the insulation no more than 7 mm. When connecting or disconnecting signal lines to the scxi terminal block screw terminals, make sure the lines a...
Chapter 3 signal connections © national instruments corporation 3-3 scxi-1124 user manual front connector figure 3-1 shows the pin assignments for the scxi-1124 front connector. Pin number signal name column a b c signal name 30 29 26 25 22 21 18 17 14 13 10 9 6 5 2 1 isink 0 supply 0 gnd 0 vout 0 i...
Signal connections chapter 3 scxi-1124 user manual 3-4 © national instruments corporation front connector signal descriptions pin signal name description a30, a26, a22, supply loop supply–these pins are the a18, a14, a10 isolated loop supplies that provide power for 0 to 20ma applications. B30, b26,...
Chapter 3 signal connections © national instruments corporation 3-5 scxi-1124 user manual figure 3-2 shows how to connect a dac channel as a voltage output. I i + - load with high common-mode voltage floating load gnd gnd scxi-1124 scxi-1124 high cmv vout vout load load v cm figure 3-2. Dac channel ...
Signal connections chapter 3 scxi-1124 user manual 3-6 © national instruments corporation figure 3-4 shows how to connect a dac channel as a current output using an external loop supply. Scxi-1124 0-20 ma isink + - gnd scxi-1124 0-20 ma a. Floating supply and floating load connection or load load + ...
Chapter 3 signal connections © national instruments corporation 3-7 scxi-1124 user manual uncontrolled loop current + - load scxi-1124 v ext 0-20 ma + - load i i isink gnd isink gnd scxi-1124 does not work a. Correct b. Incorrect v ext figure 3-5. Current loop connection, load and external supply bo...
Signal connections chapter 3 scxi-1124 user manual 3-8 © national instruments corporation 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 serdatin daqd*/a slot0sel* (mio) serclk diggnd (mio) serdatout (mio) ...
Chapter 3 signal connections © national instruments corporation 3-9 scxi-1124 user manual pin signal name description 25 serdatin serial data in–taps into the scxibus mosi line to provide serial input data to a module or slot 0. 26 or 47 serdatout serial data out–taps into the scxibus miso line to a...
Signal connections chapter 3 scxi-1124 user manual 3-10 © national instruments corporation • pin 27, daqd*/a, is equivalent to the scxibus d*/a line. It indicates to the module whether the incoming serial stream on the serdatin line is data (daqd*/a = 0) or address module (daqd*/a = 1) information. ...
Chapter 3 signal connections © national instruments corporation 3-11 scxi-1124 user manual table 3-1. Scxibus to scxi-1124 rear signal connector to daq board pin equivalences scxib us li ne scxi-1 124 rear signal connector mio boards lab boards pc-lpm-16 dio-24 dio-96 dio-32f mosi d*/a intr* spiclk ...
© national instruments corporation 4-1 scxi-1124 user manual chapter 4 theory of operation this chapter contains a functional overview of the scxi-1124 module and explains the operation of each functional unit of the scxi-1124. Functional overview the block diagram in figure 4-1 shows the key functi...
Theory of operation chapter 4 scxi-1124 user manual 4-2 © national instruments corporation the major components of the scxi-1124 are as follows: • the rear signal connector • the scxibus connector • the scxibus interface • the digital control circuitry • the analog output channels the scxi-1124 has ...
Chapter 4 theory of operation © national instruments corporation 4-3 scxi-1124 user manual analog output circuitry the scxi-1124 has six independent isolated voltage or current control outputs. Each channel has four pins on the front signal connector–a ground reference, a programmable voltage output...
Theory of operation chapter 4 scxi-1124 user manual 4-4 © national instruments corporation range. Using these two values, you can do a linear interpolation to determine the correct code to write to the dac to get a particular voltage by using the following formula: b u = b l + (v u - v l )*(b h - b ...
Chapter 4 theory of operation © national instruments corporation 4-5 scxi-1124 user manual load gnd vout r c f c = 1 2 π rc scxi-1124 adding a lowpass filter for noise reduction i figure 4-2. Rc filter changing ranges the voltage output circuitry has three operational amplifiers. When you change the...
Theory of operation chapter 4 scxi-1124 user manual 4-6 © national instruments corporation using these two values, you can do a linear interpolation to determine the proper code to write to the dac to get a particular current by using the following formula: b u = b l + (i u - i l )*(b h - b l )/(i h...
© national instruments corporation 5-1 scxi-1124 user manual chapter 5 calibration this chapter discusses the calibration procedures for the scxi-1124 module. Overview the scxi-1124 has been calibrated for maximum accuracy at the factory. You only need to read this chapter if you need to recalibrate...
Calibration chapter 5 scxi-1124 user manual 5-2 © national instruments corporation each channel and each range has different values for b l and b h . There are six channels and seven ranges, which makes 6 x 7 = 42 pairs of calibration constants to characterize the module. These constants are determi...
Chapter 5 calibration © national instruments corporation 5-3 scxi-1124 user manual voltage calibration method when you calibrate a voltage output, use the codes 0 and 4,095 to achieve the best calibration with the two-point calibration method described previously. There are two reasons why 0 and 4,0...
Calibration chapter 5 scxi-1124 user manual 5-4 © national instruments corporation • code rounding error–when you want to output a voltage, you must write an integer bit pattern. This can introduce up to 0.5 lsb of error. Most analog output boards do not include this error because it is an inherent ...
Chapter 5 calibration © national instruments corporation 5-5 scxi-1124 user manual the offset and gain errors of the scxi-1124 are small enough that b l and b h will fall within this range. If you are also trying to calibrate out additional system errors using the scxi-1124 linearization method, the...
© national instruments corporation a-1 scxi-1124 user manual appendix a specifications this appendix lists the specifications for the scxi-1124. These specifications are typical at 25 ° cand 50% humidity unless otherwise stated. The operating temperature range is 0 ° to 50 ° c. Analog outputs output...
Specifications appendix a scxi-1124 user manual a-2 © national instruments corporation current loop supply internal 15 vdc min, 21 vdc max external 3 vdc min, 42 vdc max dynamic characteristics output range 0 to +1 v 0 to +5 v 0 to +10 v -1 to +1 v -5 to +5 v- -10 to +10 v settling time 2 270 µ s 11...
© national instruments corporation b-1 scxi-1124 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...
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...
Scxi-1124 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....
Register-level programmer manual request form national instruments offers a register-level programmer manual at no charge to customers who are not using national instruments software. Title: scxi-1124 register-level programmer manual part number: 340694-01 please indicate your reasons for obtaining ...
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-1124 user manual edition date: september 1999 part number: 320694b-01 please comment on the co...
© national instruments corporation glossary-1 scxi-1124 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 ˚ degrees > greater than ≥ greater than or equal to less than - negative of, or minus Ω ohms % percent π pi ± ...
Glossary scxi-1124 user manual glossary-2 © national instruments corporation gf gauge factor gnd# isolated ground signal (0 ≤ # ≤ 5) hex hexadecimal hscr hardscan control register hz hertz i i input current leakage i in input current in. Inches inl integral nonlinearity intr* interrupt signal i/o in...
© national instruments corporation index-1 scxi-1124 user manual index a analog output channel connections, 3-4 to 3-7 dac channel connection as current output external loop supply (illustration), 3-5 internal loop supply (illustration), 3-4 dac channel connection as voltage output (illustration), 3...
Index scxi-1124 user manual index -2 © national instruments corporation documentation conventions used, viii organization of manual, vii related documentation, ix e eeprom, for storage of calibration constants determining correct codes for current output, 4-5 to 4-6 for voltage output circuitry, 4-3...
Index © national instruments corporation index-3 scxi-1124 user manual p physical specifications, a-3 pin assignments front connector illustration, 3-3 signal descriptions, 3-4 rear signal connector digital i/o signals, 3-10 to 3-11 illustration, 3-8 scxibus to scxi-1124 pin equivalences (table), 3-...
Index scxi-1124 user manual index -4 © national instruments corporation changing ranges, 4-5 current output, 4-5 to 4-6 noise reduction, 4-4 to 4-5 voltage output circuitry, 4-3 to 4-4 block diagram, 4-1 digital control circuitry, 4-2 functional overview, 4-1 major components of scxi-1124, 4-2 rear ...
