National Instruments 9237 Calibration Procedure
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National Instruments 9237 Calibration Procedure

National Instruments 9237 Calibration Procedure

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NI 9237 Calibration Procedure
Contents
This document contains information about calibrating National
Instruments 9237 modules using NI-DAQmx. This calibration procedure is
intended for metrology labs.
This document does not discuss programming techniques or compiler
configuration. The NI-DAQmx driver contains online help files that have
compiler-specific instructions and detailed function explanations. You can
install these help files when you install NI-DAQmx on the calibration
computer.
Conventions ............................................................................................ 2
Software .................................................................................................. 2
Documentation ........................................................................................ 3
Calibration Interval ................................................................................. 3
Test Equipment ....................................................................................... 4
Test Conditions ....................................................................................... 4
Calibration Procedure ............................................................................. 5
Calibration Process Overview ......................................................... 5
Initial Setup...................................................................................... 5
Verification Procedure ..................................................................... 6
Specifications .......................................................................................... 12
Test Limits .............................................................................................. 12
Using the Table ................................................................................ 12
Excitation Setting Value ........................................................... 12
Calibrator Output ...................................................................... 12
Range ........................................................................................ 12
Test Point Value ....................................................................... 13
1-Year Absolute Error .............................................................. 13
Where to Go for Support......................................................................... 14

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Summary of Contents for National Instruments 9237

  • Page 1: Table Of Contents

    NI 9237 Calibration Procedure This document contains information about calibrating National Instruments 9237 modules using NI-DAQmx. This calibration procedure is intended for metrology labs. This document does not discuss programming techniques or compiler configuration. The NI-DAQmx driver contains online help files that have compiler-specific instructions and detailed function explanations.

  • Page 2: Conventions

    You must have the proper device driver installed on the calibration system before calibrating the device. Note NI recommends that you install the NI-DAQmx driver software before physically installing the NI 9237. NI-DAQmx, available at , configures and ni.com/downloads controls the NI 9237.

  • Page 3: Documentation

    NI Web site at ni.com/manuals Calibration Interval The NI 9237 should be calibrated at a regular interval as defined by the measurement accuracy requirements of your application. National Instruments recommends that you routinely perform a complete calibration at least once every year. You can shorten this interval based on the accuracy demands of your application or requirements of your processes.

  • Page 4: Test Equipment

    Test Equipment National Instruments recommends that you use the following equipment for calibrating the NI 9237. Table 1. Recommended Equipment Equipment Recommended Model Requirements Calibrator Fluke 5700A If this instrument is unavailable, use a high-precision voltage source with an accuracy of at least 10 ppm and an output impedance of less than or equal to 50 Ω.

  • Page 5: Calibration Procedure

    DAQ device to calibrate. This document uses to refer to the device name. In the following procedures, use the device name as it dev1 appears in MAX. © National Instruments Corporation NI 9237 Calibration Procedure...

  • Page 6: Verification Procedure

    If the calibrator has a separate guard connection not connected to LO, connect that terminal to AI–. Refer to Table 2 for the pin assignments and signal names of the NI 9237. Refer to Figure 1 for an illustration of the NI 9949 connections.
  • Page 7 Positive excitation output EX– Negative excitation output TEDS DATA T– TEDS Return Shunt calibration * These signals are shared by all four RJ-50 connectors on the NI 9237. Calibrator AI– – + Guard RS– EX– Figure 1. NI 9949 Connections ©...
  • Page 8 If you use LabVIEW, skip this step. The task is created in step 4 in LabVIEW. LabVIEW Block Diagram NI-DAQmx Function Call Call with DAQmxCreateTask the following parameters: LabVIEW does not require this step. taskName: AIVerificationTask taskHandle: &taskHandle NI 9237 Calibration Procedure ni.com...
  • Page 9 TRUE customScaleName: NULL Use the excitation value that corresponds to the calibrator voltage value you set in step 2. Refer to Table 4 for corresponding excitation setting and calibrator output values. © National Instruments Corporation NI 9237 Calibration Procedure...
  • Page 10 DAQmx_Val_Rising sampleMode: DAQmx_Val_FiniteSamps sampsPerChan: 10000 Start the acquisition using the DAQmx Start Task VI, as shown in the following table. LabVIEW Block Diagram NI-DAQmx Function Call Call with the DAQmxStartTask following parameter: taskHandle: taskHandle NI 9237 Calibration Procedure ni.com...
  • Page 11 DAQmxClearTask following parameter: taskHandle: taskHandle 12. Repeat steps 2 through 11 for all voltage values, all excitation values, and all channels. 13. Disconnect the calibrator and the DMM from the device. © National Instruments Corporation NI 9237 Calibration Procedure...

  • Page 12: Specifications

    0.14% 27.5 10.0 0.16% Test Limits Table 4 lists the specifications that the NI 9237 should meet if it has been one year between calibrations. Using the Table The following definitions describe how to use the information from Table 4.

  • Page 13: Test Point Value

    Test Point Value The Test Point Value is an approximate voltage value that the NI 9237 should read given the corresponding calibrator output and excitation setting. 1-Year Absolute Error The 1-Year Absolute Error is the voltage value that you use to calculate upper and lower limits.

  • Page 14: Where To Go For Support

    Instruments trademarks. Other product and company names mentioned herein are trademarks or trade names of their respective companies. For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software, the patents.txt file on your CD, or ni.com/patents.

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