National Instruments SCXI-1104/C Calibration Procedure
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National Instruments SCXI-1104/C Calibration Procedure

Signal conditioning module
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CALIBRATION PROCEDURE
SCXI -1104/C
™
For NI-DAQmx
Contents
This document contains information and instructions for calibrating the
National Instruments SCXI-1104/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...................................................................... 11
Verifying Adjusted Values .............................................................. 13
Test Limits .............................................................................................. 13
Gain and Offset ................................................................................ 13
SCXI-1104/C Front and Rear Panel Diagrams ....................................... 14
World Wide Support and Services.......................................................... 17

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Summary of Contents for National Instruments SCXI-1104/C

  • Page 1: Table Of Contents

    Calibration Process ................. 5 Initial Setup..................5 Verification Procedure ..............7 Adjustment Procedure..............11 Verifying Adjusted Values .............. 13 Test Limits ....................13 Gain and Offset ................13 SCXI-1104/C Front and Rear Panel Diagrams ........14 World Wide Support and Services............17...

  • Page 2: Conventions

    Software The SCXI-1104/C calibration procedure requires the NI-DAQmx driver. NI recommends using the latest driver that supports both your development environment and the SCXI-1104/C. NI-DAQmx includes high-level function calls to simplify the task of writing software to calibrate devices.

  • Page 3: Documentation

    SCXI Quick Start Guide. Calibration Interval Calibrate the SCXI-1104/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

    Terminal Block SCXI-1300 — Note A complete SCXI-1104/C calibration system is illustrated in Figure 1 with a listing of all the components required for calibrating the SCXI-1104/C. Test Conditions Follow these guidelines to optimize the connections and the environment during calibration: •...

  • Page 5: Calibration Process

    Assemble the SCXI-1104/C, SCXI chassis, terminal blocks, and DAQ device as shown in Figure 1. You must cable the SCXI-1104/C directly to the DAQ device. Install the SCXI-1104/C module in slot 1 of the SCXI chassis. © National Instruments...
  • Page 6 Dev1 for the DAQ device and SC1Mod1 for the SCXI-1104/C. If you have more devices in your setup, use MAX to identify your DAQ device name.

  • Page 7: Verification Procedure

    You can use this information to select the appropriate calibration interval for your application. The SCXI-1104/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-1104/C.
  • Page 8 Complete the following steps to verify the accuracy of each SCXI-1104/C analog input channel: Use the DAQmx Self Calibrate VI to verify the DAQ device. This VI measures the onboard reference voltage of the DAQ device and adjusts the self-calibration constants to account for any errors caused by short-term fluctuations in the operating environment.
  • Page 9 1000.0 activeEdge: DAQmx_Val_Rising sampleMode: DAQmx_Val_FiniteSamps sampsPerChan: 1000 Commit the verification changes using the DAQmx Control Task VI. LabVIEW Block Diagram NI-DAQmx Function Call Call with the following DAQmxTaskControl parameters: taskHandle: taskHandle action: DAQmx_Val_Task_Commit © National Instruments SCXI-1104/C Calibration Procedure...
  • Page 10 For each new test point, use the Time Delay Express VI to account for the settling time of the SCXI-1104/C. LabVIEW Block Diagram Function Call Call a function to suspend sleep wait execution for 350 ms. Acquire 1000 points of voltage data using the Analog 1D DBL 1Chan NSamp instance of the DAQmx Read VI.

  • Page 11: Adjustment Procedure

    13. Repeat steps 4 through 12 for the remaining channels. 14. Repeat steps 3 through 13 for all test points in Tables 3. You have finished verifying the analog input accuracy of the SCXI-1104/C. Adjustment Procedure The adjustment procedure adjusts the gain and offset calibration constants on the SCXI-1104/C.
  • Page 12 Set the SCXI-1104/C to a physical channel using the DAQmx Setup SCXI Calibration VI. LabVIEW Block Diagram NI-DAQmx Function Call Call with the following DAQmxSetup1104Cal parameters: calHandle: calHandle channel: † "SC1Mod1/ai X " † Where refers to the channel you are calibrating.

  • Page 13: Verifying Adjusted Values

    DAQmx_Val_Action_Commit 10. Repeat steps 1 through 9 for the remaining channels. You have finished adjusting the gain and offset of the SCXI-1104/C. Verifying Adjusted Values After calibrating the SCXI-1104/C, NI recommends that you verify the analog input operation by repeating the steps listed in the...

  • Page 14: Scxi-1104/C Front And Rear Panel Diagrams

    SCXI-1104/C Front and Rear Panel Diagrams Table 4 shows the pin assignments for the SCXI-1104/C front panel connector. Table 5 shows the pin assignments for the SCXI-1104/C rear signal connector. SCXI-1104/C Calibration Procedure ni.com...
  • Page 15 CH 26– CH 26+ CH GND CH 27– CH 27+ RSVD CH 28– CH 28+ RSVD CH 29– CH 29+ NC—No Connection CH GND CH 30– CH 30+ RSVD—Reserved +5 V CH 31– CH 31+ © National Instruments SCXI-1104/C Calibration Procedure...
  • Page 16 29 30 DAQ D*/A 31 32 SLOT 0 SEL* 33 34 35 36 D GND 37 38 39 40 SCANCLK 41 42 43 44 SER CLK 45 46 47 48 49 50 RSVD NC—No Connection RSVD RSVD—Reserved SCXI-1104/C Calibration Procedure ni.com...

  • Page 17: World Wide Support And Services

    World Wide Support and Services The National Instruments website is your complete resource for technical support. At you have access to everything from ni.com/support troubleshooting and application development self-help resources to email and phone assistance from NI Application Engineers. Visit for NI Factory Installation Services, repairs, ni.com/services...
  • Page 18 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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