National Instruments SCXI -1125 manual


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Table of contents for the manual

  • Page 1

    CVI ™ , LabVIEW ™ , Natio nal Instru ments ™ ,n i . c o m ™ ,N I - D A Q ™ , and SCXI ™ are trademarks of National Instruments Corporation. Product a nd company names mentioned herein are tr ademarks or trade names of their respective companies. 370271A-01 © Copyright 2000 National Instruments Corp. All rights reserved. December 2000 C[...]

  • Page 2

    SCXI-1125 Calibration Procedure 2 Equipment and Other T est Requirements This section describes the equipment, software, documentation, and test conditions required for calibrat ing the SCXI-1125. T est Equipment Calibration requires a high-precisi on voltage source with at least 50 ppm accuracy, a multiranging 5 1/2 digit digital multimeter[...]

  • Page 3

    © National Instruments Corpor ation 3 SCXI-1125 Calibration Procedur e Documentation The NI-DAQ Function Refe rence Online Help fi le and NI-DAQ User Manual for PC Compa tibles c o n t a i nd e t a i l e di n f o r m a t i o no nu s i n gt h e NI-DAQ driver. The funct ion reference online h elp file includes detaile d information on the driver fun[...]

  • Page 4

    SCXI-1125 Calibration Procedure 4 Setting Up Y our Module Complete the following steps to set up yo ur module for testing : 1. Install the SCXI-1125 in sl ot 1 of the SCXI chassis. 2. Connect a 68-to-68-pin cable between the S CXI module and the E Series D A Q de vice installed in the host computer . 3. Configure the hardware with Measuremen[...]

  • Page 5

    © National Instruments Corpor ation 5 SCXI-1125 Calibration Procedur e 7. Connect the calibrator to the appro priate analog input, starting with channel 0. Refer to Figure 1 to determine which pins on the 96-pin front conn ector correspond to t he positiv e and negati ve inputs of the specified channel. Fo r example, the positive input for channel[...]

  • Page 6

    SCXI-1125 Calibration Procedure 6 13. Call SCXI_Scale . Set the following parameters: • SCXIChassisID — The v alue assigned b y MAX • moduleSlot — 1 • channel — The same channel number from step 7 • SCXIgain — The same gain value from step 9 • TBgain — 1 • DAQboard — The device number for the D A Q device • DAQChann[...]

  • Page 7

    © National Instruments Corpor ation 7 SCXI-1125 Calibration Procedur e • calOp — ND_SELF_CALIBRATE • s etOfCalConstants — ND_USER_EEPROM_AREA • calRefVolts — 0.0 4. Call AI_Configure to put the E Series device in bipolar mode. Set t he following parameters: • deviceNumb er — The v alue assigned b y MAX • chan — 0 • inputMode [...]

  • Page 8

    SCXI-1125 Calibration Procedure 8 • filterMode — 1 • cutoffFrequency — 10,000 9. Connect the calibrator to the analog input you w ant to adjust. Refer to Figure 1 to determine the pins on the 96-pin f ront connector that correspond to the positiv e and neg ati ve inputs of the specif ied channel. For e xamp le, the positi ve input fo[...]

  • Page 9

    © National Instruments Corpor ation 9 SCXI-1125 Calibration Procedur e 16. Record binary1 with volt1 and binary2 with volt2 for later use. 17. Repeat steps 7 through 16 for the remaining gain v alues you want to adjust on this channel. 18. Repeat steps 6 through 17 for the remaining chan nels you want to adjust. Y ou hav e determined the new calib[...]

  • Page 10

    SCXI-1125 Calibration Procedure 10 V erifying Adjusted V alues After completing the adjustment s to your SCXI-1125 module, it is important that you verify the analog input operation by repeating t he steps listed in the Veri fying Gain and Offset Errors section of this docu ment. Reverifying after adjustments ensures that your SCXI-1125 mod [...]

  • Page 11

    © National Instruments Corpor ation 11 SCXI-1125 Calibration Procedur e Front and Rear Signal Connector Diagrams Figure 1. Front Signal Connector Pin Assignments CHSGND +5 V RSVD CH7+ CH6+ CH5+ CH4+ CH3+ CH2+ CH1+ NC NC NC NC RSVD CH0+ 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 AB RSVD CJTEMP RSVD RSVD [...]

  • Page 12

    SCXI-1125 Calibration Procedure 12 Figure 2. Rear Signal Connector Pin Assignments SERCLK DIGGND SLOT0SEL* DAQD*/A SERDATIN OUTREF MCH7+ MCH6+ MCH5+ MCH4+ MCH3+ MCH2+ MCH1+ MCH0+ AOGND SCANCLK SYNC SERDATOUT DIGGND MCH7 – MCH6 – MCH5 – MCH4 – MCH3 – MCH2 – MCH1 – MCH0 – AOGND 49 50 47 48 45 46 43 44 41 42 39 40 37 38 35 36 33[...]

  • Page 13

    © National Instruments Corpor ation 13 SCXI-1125 Calibration Procedur e Specifications The following table contains the sp ecifications you should use w hen verifying and calibrating y our SCXI-1125 module. If you r device has been calibrated within the last year, the test point value should fall between the Upper Limit and Lower Limit valu es. Ta[...]

  • Page 14

    SCXI-1125 Calibration Procedure 14 200 – 0.025 – 0.024750 – 0.02468642 – 0 .02481358 250 0.02 0.019800 0.01985126 0.019 74874 250 0 0.000000 0.000022 – 0.000022 250 – 0.02 – 0.019800 – 0.01974874 – 0.0 1985126 500 0.01 0.009900 0.00992663 0.009 87337 500 0 0.000000 0.000012 – 0.000012 500 – 0.01 – 0.009900 – 0.00987[...]