National Instruments PXIe-6672 Calibration Procedure
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CALIBRATION PROCEDURE
NI PXIe-6672
Contents

Conventions

»
This document describes how to write a calibration procedure for the
10 MHz oscillator frequency of the NI PXIe-6672 timing and
synchronization module.
Conventions ............................................................................................ 1
Software .................................................................................................. 2
Documentation ........................................................................................ 2
Calibration Interval ................................................................................. 3
Password ................................................................................................. 3
Test Equipment ....................................................................................... 3
Test Conditions ....................................................................................... 3
Calibration Procedure ............................................................................. 4
Initial Setup...................................................................................... 4
Verification ...................................................................................... 4
Measuring the Frequency ......................................................... 6
Adjustment....................................................................................... 9
Reverification................................................................................... 13
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Summary of Contents for National Instruments PXIe-6672

  • Page 1: Table Of Contents

    CALIBRATION PROCEDURE NI PXIe-6672 This document describes how to write a calibration procedure for the 10 MHz oscillator frequency of the NI PXIe-6672 timing and synchronization module. Contents Conventions .................... 1 Software ....................2 Documentation ..................2 Calibration Interval ................. 3 Password ....................
  • Page 2: Software

    LabVIEW code for implementing calibration steps using NI-Sync and NI-VISA. Documentation You need the NI-Sync User Manual to calibrate the NI PXIe-6672. The NI-Sync User Manual contains detailed information about using the NI-Sync driver, including information about installing NI-Sync and creating applications that use the NI-Sync driver.
  • Page 3: Calibration Interval

    • Use shielded copper wire for all cable connections to the device. • Allow a warm-up time of at least 15 minutes for the NI PXIe-6672 to ensure the measurement circuitry is at a stable operating temperature. • Keep PXI chassis filters clean and fan speed set to High.
  • Page 4: Calibration Procedure

    Adjustment. Reverification. Initial Setup Complete the following steps to set up the NI PXIe-6672 for calibration. Make sure all components involved in the calibration procedure are powered off. Install the NI PXIe-6672 board into the system timing slot of your chassis.
  • Page 5 VI_FALSE Call niSync Connect Clock Terminals VI to connect ClkIn to PXI_Clk10_In. LabVIEW Block Diagram NI-SYNC C Function Call Call niSync_ConnectClkTerminals with the following parameters: “< SessionHandle >” sourceTerminal: NISYNC_VAL_CLKIN destinationTerminal: NISYNC_VAL_CLK10 © National Instruments Corporation NI PXIe-6672 Calibration Procedure...
  • Page 6: Measuring The Frequency

    Set a writable NI-Sync property node to pass TRUE to the ClkOut Gain Enable attribute. LabVIEW Block Diagram NI-SYNC C Function Call Call niSync_SetAttributeViBoolean with the following parameters: “< SessionHandle >” terminalName: ““ attributeID: NISYNC_ATTR_CLKOUT_GAIN_ENABLE attributeValue: VI_TRUE NI PXIe-6672 Calibration Procedure ni.com...
  • Page 7 Call niSync Initialize VI to set up a handle for the device. LabVIEW Block Diagram NI-SYNC C Function Call Call with the following niSync_init parameters: resourceName: Dev1 idQuery: NULL resetDevice: VI_FALSE vi: * SessionHandle © National Instruments Corporation NI PXIe-6672 Calibration Procedure...
  • Page 8 To determine if the device under test meets its specifications, you must compare the measured frequency obtained in Step 3 of Measuring the Frequency with the specified accuracy. Table 1 shows the frequency range that is acceptable according to the published specifications for the NI PXIe-6672. NI PXIe-6672 Calibration Procedure ni.com...
  • Page 9: Adjustment

    Call niSync Initialize VI to set up a handle for the device. LabVIEW Block Diagram NI-SYNC C Function Call Call with the following niSync_init parameters: resourceName: Dev1 idQuery: NULL resetDevice: VI_FALSE vi: * SessionHandle © National Instruments Corporation NI PXIe-6672 Calibration Procedure...
  • Page 10 Complete steps a–c to measure PFI 0. Call niSync Initialize VI to set up a handle for the device. LabVIEW Block Diagram NI-SYNC C Function Call Call with the following niSync_init parameters: resourceName: Dev1 idQuery: NULL resetDevice: VI_FALSE vi: * SessionHandle NI PXIe-6672 Calibration Procedure ni.com...
  • Page 11 Call niSync Initialize External Calibration VI to initialize the process. is the default user password. If you have changed the calibration password, use Note NI your user-selected calibration password in place of © National Instruments Corporation NI PXIe-6672 Calibration Procedure...
  • Page 12 > oldVoltage: *oldVoltage Call niSync Close External Calibration VI to commit the settings and close the session. LabVIEW Block Diagram NI-SYNC C Function Call Call with the niSync_CloseExtCal following parameter: “< SessionHandle >” action: NISYNC_VAL_EXT_CAL_COMMIT NI PXIe-6672 Calibration Procedure ni.com...
  • Page 13: Reverification

    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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