National Instruments SCXI-1125 Calibration Procedure
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National Instruments SCXI-1125 Calibration Procedure

National Instruments SCXI-1125 Calibration Procedure

Signal conditioning module for ni-daq mx
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CALIBRATION PROCEDURE
™
SCXI
-1125
™
For NI-DAQ
mx
Contents

Conventions

»
Note
This icon denotes a note, which alerts you to important information.
This document contains information and instructions for calibrating the
National Instruments SCXI-1125 signal conditioning module.
Conventions ............................................................................................ 1
Software .................................................................................................. 2
Documentation ........................................................................................ 2
Calibration Interval ................................................................................. 3
Password ................................................................................................. 3
Test Equipment ....................................................................................... 3
Test Conditions ....................................................................................... 3
Calibration Process ................................................................................. 4
Initial Setup...................................................................................... 4
Verification Procedure ..................................................................... 5
Adjustment Procedure...................................................................... 10
Verifying Adjusted Values .............................................................. 12
Test Limits .............................................................................................. 13
Gain and Offset ................................................................................ 13
SCXI-1125 Front and Rear Panel Diagrams........................................... 15
World Wide Support and Services.......................................................... 18
The following conventions are used in this document:
The » symbol leads you through nested menu items and dialog box options
to a final action. The sequence File»Page Setup»Options directs you to
pull down the File menu, select the Page Setup item, and select Options
from the last dialog box.

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Summary of Contents for National Instruments SCXI-1125

  • Page 1: Table Of Contents

    Adjustment Procedure..............10 Verifying Adjusted Values .............. 12 Test Limits ....................13 Gain and Offset ................13 SCXI-1125 Front and Rear Panel Diagrams........... 15 World Wide Support and Services............18 Conventions The following conventions are used in this document: »...

  • Page 2: Software

    You can access these documents by selecting Start»All Programs» National Instruments»NI-DAQmx after installing NI-DAQmx. For more information about the SCXI-1125, refer to the SCXI-1125 User Manual. For information about installing and configuring SCXI modules, refer to the SCXI Quick Start Guide.

  • Page 3: Calibration Interval

    • Keep relative humidity below 80%. • Allow a warm-up time of at least 15 minutes for the SCXI-1125 and 30 minutes for the DAQ device to ensure that the measurement circuitry is at a stable operating temperature. © National Instruments Corporation...

  • Page 4: Calibration Process

    Verifying Adjusted Values—Perform another verification to ensure that the SCXI-1125 is operating within its test limits after adjustments. Initial Setup Complete the following steps to configure the SCXI-1125 for calibration: Make sure that all the appropriate driver and application software is installed.
  • Page 5 Assemble the SCXI-1125, SCXI chassis, terminal blocks, and DAQ device as shown in Figure . You must cable the SCXI-1125 directly to the DAQ device. ® 1 SCXI-1320 Terminal Block 7 CB-50 Connector Block 2 SCXI-1125 Module 8 Cable to DMM...

  • Page 6: Verification Procedure

    You can use this information to select the appropriate calibration interval for your application. The SCXI-1125 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-1125.
  • Page 7 Complete the following steps to verify the accuracy of each SCXI-1125 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 8 Where refers to the channel you are verifying. Set the SCXI-1125 to a gain setting that corresponds to the current test point in Table 2 using the DAQmx Channel Property Node. You can find the AI.Gain property by selecting Analog Input»General Properties»Advanced»Gain.
  • Page 9 For each new test point, use the Time Delay Express VI to account for the 5 second settling time. LabVIEW Block Diagram Function Call Call a function to suspend sleep wait execution for the necessary settling time. Delay Time: © National Instruments Corporation SCXI-1125 Calibration Procedure...

  • Page 10: Adjustment Procedure

    14. Repeat steps 4 through 13 for the remaining channels. 15. Repeat steps 3 through 14 for all test points in Table 2. You have finished verifying the analog input accuracy of the SCXI-1125. Adjustment Procedure The adjustment procedure adjusts the gain and offset calibration constants on the SCXI-1125.
  • Page 11 DAQmxInitExtCal parameters: deviceName: "SC1Mod1" password: "NI" calHandle: &calHandle Set the SCXI-1125 to a gain value listed in Table 3 using the DAQmx Setup SCXI Calibration VI. LabVIEW Block Diagram NI-DAQmx Function Call Call with the following DAQmxSetup1125Cal parameters: calHandle:...

  • Page 12: Verifying Adjusted Values

    10. Repeat steps 3 through 9 for all gain values in Table 3. 11. Repeat steps 2 through 10 for the remaining channels. You have finished adjusting the gain and offset of the SCXI-1125. Verifying Adjusted Values After calibrating the SCXI-1125, NI recommends that you verify the...

  • Page 13: Test Limits

    Table 2 contains the test limits to use when verifying the gain and offset of the SCXI-1125. Table 3 contains the set points for the adjustment. If the SCXI-1125 was calibrated within the last year, the test point value should fall between the Lower Limit and Upper Limit values found in Table 2.
  • Page 14 Limits valid for 4 Hz or 10 kHz filter settings. Valid when using an MIO device after performing an MIO internal calibration. Valid for both filter settings with 1,000 point averaging at 1,000 samples per second. SCXI-1125 Calibration Procedure ni.com...

  • Page 15: Scxi-1125 Front And Rear Panel Diagrams

    -0.00075 -0.0015 -0.00225 SCXI-1125 Front and Rear Panel Diagrams Table 4 shows the pin assignments for the SCXI-1125 front panel connector. Table 5 shows the pin assignments for the SCXI-1125 rear signal connector. © National Instruments Corporation SCXI-1125 Calibration Procedure...
  • Page 16 — — — RSVD — RSVD — — — RSVD — RSVD — — — +5 V — CJ TEMP — — — RSVD—Reserved CHS GND — RSVD NC—no connection — — — — no pin SCXI-1125 Calibration Procedure ni.com...
  • Page 17 39 40 — AI HOLD COMP, AI HOLD 41 42 43 44 SER CLK — 45 46 — — 47 48 — — 49 50 — — — SYNC — — — — © National Instruments Corporation SCXI-1125 Calibration Procedure...

  • Page 18: World Wide Support And Services

    For patents covering NI 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. You can find information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your NI product.

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