National Instruments SCXI-1102 Calibration Procedure
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National Instruments SCXI-1102 Calibration Procedure

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CALIBRATION PROCEDURE
SCXI -1102/B/C
™
For NI-DAQmx
Contents
This document contains information and instructions for calibrating the
National Instruments SCXI-1102/B/C signal conditioning module.
Conventions ............................................................................................ 2
Software .................................................................................................. 2
Documentation ........................................................................................ 3
Calibration Interval ................................................................................. 3
Password ................................................................................................. 3
Test Equipment ....................................................................................... 4
Test Conditions ....................................................................................... 4
Calibration Process ................................................................................. 5
Initial Setup...................................................................................... 5
Verification Procedure ..................................................................... 7
Adjustment Procedure...................................................................... 12
Verifying Adjusted Values .............................................................. 14
Test Limits .............................................................................................. 14
Gain and Offset ................................................................................ 15
SCXI-1102/B/C Front and Rear Panel Diagrams ................................... 15
World Wide Support and Services.......................................................... 18

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Summary of Contents for National Instruments SCXI-1102

  • Page 1: Table Of Contents

    Calibration Process ................. 5 Initial Setup..................5 Verification Procedure ..............7 Adjustment Procedure..............12 Verifying Adjusted Values .............. 14 Test Limits ....................14 Gain and Offset ................15 SCXI-1102/B/C Front and Rear Panel Diagrams ........15 World Wide Support and Services............18...

  • Page 2: Conventions

    Software The SCXI-1102/B/C calibration procedure requires the NI-DAQmx driver. NI recommends using the latest driver that supports both your development environment and the SCXI-1102/B/C. NI-DAQmx includes high-level function calls to simplify the task of writing software to calibrate devices.

  • Page 3: Documentation

    SCXI modules, refer to the SCXI Quick Start Guide. Calibration Interval Calibrate the SCXI-1102/B/C at a regular interval as defined by the measurement accuracy requirements of your application. NI recommends that you perform a complete calibration at least once every year. You can shorten this interval based on the accuracy requirements of your application.

  • Page 4: Test Equipment

    • Keep relative humidity below 80%. • Allow a warm-up time of at least 15 minutes for the SCXI-1102/B/C and 30 minutes for the DAQ device to ensure that the measurement circuitry is at a stable operating temperature. SCXI-1102/B/C Calibration Procedure...

  • Page 5: Calibration Process

    Make sure all components involved in the calibration procedure are powered off. Assemble the SCXI-1102/B/C, SCXI chassis, terminal blocks, and DAQ device as shown in Figure 1. You must cable the SCXI-1102/B/C directly to the DAQ device. © National Instruments...
  • Page 6 When you configure a device in MAX, the device is assigned a device identifier. In this calibration document, the functions used for demonstrating the calibration process use the device identifiers Dev1 for the DAQ device and SC1Mod1 for the SCXI-1102/B/C. SCXI-1102/B/C Calibration Procedure...

  • Page 7: Verification Procedure

    You can use this information to select the appropriate calibration interval for your application. The SCXI-1102/B/C stores gain and offset calibration constants for each gain setting per analog input channel. A complete verification of the inputs involves measuring the accuracy at all possible gain settings on all channels of the SCXI-1102/B/C.
  • Page 8 If you are not using the recommended SCXI-1300, refer to Table 8 for the front signal pin assignments of the SCXI-1102/B/C. If the calibration signal source is floating, connect AI – to the SCXI chassis ground using the ground lug available on the SCXI terminal block.
  • Page 9 Input»General Properties»Advanced»Gain. Use the gain setting that corresponds to the current test point. LabVIEW Block Diagram NI-DAQmx Function Call Call with the following DAQmxSetAIGain parameters: taskHandle: taskHandle Channel: "" Data: (gain value for particular test point) float64 © National Instruments SCXI-1102/B/C Calibration Procedure...
  • Page 10 DAQmx_Val_Task_Commit For each new test point, use the Time Delay Express VI to account for the settling time of the SCXI-1102/B/C. Refer to Table 2 for the settling time of the SCXI-1102/B/C. Table 2. Settling Time of the SCXI-1102/B/C...
  • Page 11 12. Compare the resulting average to the upper and lower limits listed in Tables 6 or 7. If the result is between the upper and lower limits, the SCXI-1102/B/C passes the test. 13. Clear the acquisition using the DAQmx Clear Task VI.

  • Page 12: Adjustment Procedure

    If you are not using the recommended SCXI-1300, refer to Table 8 for the front signal pin assignments of the SCXI-1102/B/C. If the calibration signal source is floating, connect AI- to the SCXI chassis ground using the ground lug available on the SCXI terminal block.
  • Page 13 Set the SCXI-1102/B/C to a gain value of 1 or 100 using the DAQmx Setup SCXI Calibration VI. LabVIEW Block Diagram NI-DAQmx Function Call Call with the following DAQmxSetup1102Cal parameters: calHandle: calHandle channelNames: † "SC1Mod1/aiX" gain: † Where refers to the channel you are calibrating.

  • Page 14: Verifying Adjusted Values

    10. Repeat steps 3 through 9 for both gain values in Table 3. 11. Repeat steps 1 through 10 for the remaining channels. You have finished adjusting the gain and offset of the SCXI-1102/B/C. Verifying Adjusted Values After calibrating the SCXI-1102/B/C, NI recommends that you verify the...

  • Page 15: Gain And Offset

    Gain and Offset Table 6 contains the test limits to use when verifying and adjusting the gain and offset of the SCXI-1102 and SCXI-1102B. Table 7 contains the test limits to use when verifying and adjusting the gain and offset of the SCXI-1102C.
  • Page 16 AI 26– AI 26+ CH GND AI 27– AI 27+ CJ SENSOR AI 28– AI 28+ CJ SENSOR AI 29– AI 29+ NC—No Connection CH GND AI 30– AI 30+ +5 V AI 31– AI 31+ SCXI-1102/B/C Calibration Procedure ni.com...
  • Page 17 SLOT 0 SEL* 33 34 35 36 D GND 37 38 39 40 AI HOLD COMP, AI HOLD 41 42 43 44 SER CLK 45 46 47 48 49 50 RSVD NC—No Connection RSVD RSVD—Reserved © National Instruments SCXI-1102/B/C Calibration Procedure...

  • Page 18: World Wide Support And Services

    Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for more information on National Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products/technology, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patents Notice at ni.com/patents.

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Scxi-1102bScxi-1102c

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