Instruction/ maintenance manual of the product SCXI -1125 National Instruments
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SCXI-1125 Calibration Procedure 2 ni.com Equipment and Other T est Requirements This section describes the equipment, software, documentation, and test conditions required for calibrat ing the SCXI-1125.
© 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.
SCXI-1125 Calibration Procedure 4 ni.com 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 .
© 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.
SCXI-1125 Calibration Procedure 6 ni.com 13. Call SCXI_Scale . Set the following parameters: • SCXIChassisID — The v alue assigned b y MAX • moduleSlot — 1 • channel — The same channel num.
© National Instruments Corpor ation 7 SCXI-1125 Calibration Procedur e • calOp — ND_SELF_CALIBRATE • s etOfCalConstants — ND_USER_EEPROM_AREA • calRefVolts — 0.
SCXI-1125 Calibration Procedure 8 ni.com • 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.
© 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.
SCXI-1125 Calibration Procedure 10 ni.com 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.
© 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+ .
SCXI-1125 Calibration Procedure 12 ni.com Figure 2. Rear Signal Connector Pin Assignments SERCLK DIGGND SLOT0SEL* DAQD*/A SERDATIN OUTREF MCH7+ MCH6+ MCH5+ MCH4+ MCH3+ MCH2+ MCH1+ MCH0+ AOGND SCANCLK .
© 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.
SCXI-1125 Calibration Procedure 14 ni.com 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.
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If you already are a holder of National Instruments SCXI -1125, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime National Instruments SCXI -1125.
However, one of the most important roles played by the user manual is to help in solving problems with National Instruments SCXI -1125. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device National Instruments SCXI -1125 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
