National Instruments PXIe-6674T Calibration Procedure
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National Instruments PXIe-6674T Calibration Procedure

National Instruments PXIe-6674T Calibration Procedure

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CALIBRATION PROCEDURE
NI PXIe-6674T
This document describes how to write a calibration procedure for the 10 MHz oscillator
frequency of the NI PXIe-6674T timing and synchronization modules.
Contents
Software.................................................................................................................................... 1
Documentation.......................................................................................................................... 1
Calibration Interval................................................................................................................... 2
Password ................................................................................................................................... 2
Test Equipment......................................................................................................................... 2
Test Conditions......................................................................................................................... 2
Calibration Procedure ............................................................................................................... 2
Initial Setup....................................................................................................................... 3
Verification....................................................................................................................... 3
Connecting the Clock Source ................................................................................... 3
Measuring the Frequency ......................................................................................... 5
Adjustment........................................................................................................................ 7
Reverification ................................................................................................................... 9
Worldwide Support and Services ............................................................................................. 10

Software

This calibration procedure requires NI-Sync and NI-VISA. NI-Sync and NI-VISA support a
number of application development environments (ADEs) and programming languages,
including LabVIEW, LabWindows
drivers, you need to install support for only the ADE or programming language you are using.

Documentation

You need the NI-Sync User Manual to calibrate the NI PXIe-6674T.
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. These sources, along with this document, are your primary references for writing your
calibration utility. You also can refer to the documentation for the programming language or
application development environment you are using. For further information about the device
you are calibrating, refer to the NI PXIe-6674T User Manual.
™
/CVI
™
, and Microsoft Visual C++. When you install the

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Summary of Contents for National Instruments PXIe-6674T

  • Page 1: Table Of Contents

    ADE or programming language you are using. Documentation You need the NI-Sync User Manual to calibrate the NI PXIe-6674T. 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 2: Calibration Interval

    The measurement requirements of the application determine how often you should calibrate the device to ensure its accuracy. National Instruments recommends that you calibrate the NI PXIe-6674T yearly. You may want to shorten this interval based on the application demands. Password...

  • Page 3: Initial Setup

    Make sure the PXI Express chassis involved in the calibration procedure is powered off. Install the NI PXIe-6674T board into the system timing slot of your chassis. The module must be installed in the system timing slot of the chassis.
  • Page 4 > sourceTerminal: NISYNC_VAL_CLKIN destinationTerminal: NISYNC_VAL_CLK10 Call niSync Close VI to close the handle. LabVIEW Block Diagram NI-SYNC C Function Call Call with the niSync_close following parameter: vi: “ SessionHandle ” < > 4 | ni.com | NI PXIe-6674T Calibration Procedure...

  • Page 5: Measuring The Frequency

    Call niSync Measure Frequency VI to measure the frequency of the oscillator. LabVIEW Block Diagram NI-SYNC C Function Call Call niSync_MeasureFrequency with the following parameters: vi: “ SessionHandle ” < > sourceTerminal: NISYNC_VAL_OSCILLATOR duration: actualDuration: *actualDuration measuredFrequency: *measuredFrequency error: *error NI PXIe-6674T Calibration Procedure | © National Instruments | 5...
  • Page 6 If the measured value is within the low-limit and high-limit range listed under the Calibration Measurement Target Frequency Range in Table 3, the board is considered to be calibrated and no adjustment is needed. 6 | ni.com | NI PXIe-6674T Calibration Procedure...

  • Page 7: Adjustment

    A binary search algorithm may be used to find the optimal oscillator control Note voltage. The NI PXIe-6674T uses a 16-bit digital-to-analog converter (DAC) to create the oscillator control voltage, therefore at most 16 iterations of adjusting and measuring would be needed to calibrate the 10 MHz oscillator.
  • Page 8 LabVIEW Block Diagram NI-SYNC C Function Call Call with the niSync_InitExtCal following parameters: resourceName: “ MAX ID ” < > password: calibrationInstrumentHandle: SessionHandle 8 | ni.com | NI PXIe-6674T Calibration Procedure...

  • Page 9: Reverification

    > action: NISYNC_VAL_EXT_CAL_COMMIT Reverification After completing the adjustments to the NI PXIe-6674T, it is important that you verify the oscillator frequency operation by repeating the steps listed in the Verification section. Re-verifying after making the adjustments ensures that the NI PXIe-6674T is operating within its test limits.

  • Page 10: Worldwide 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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