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CALIBRATION PROCEDURE
NI PXI-665x
Contents
Conventions
»
This document describes how to write a calibration procedure for the
10 MHz oscillator frequency of the NI PXI-6653 and NI PXI-6652 timing
and synchronization modules.
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
Connecting the Clock Source ................................................... 4
Measuring the Frequency ......................................................... 6
Adjustment....................................................................................... 10
Reverification................................................................................... 13
Where to Go for Support......................................................................... 14
The following conventions apply to this document:
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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 NI PXI-665 Series
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Page 1: Table Of Contents
CALIBRATION PROCEDURE NI PXI-665x This document describes how to write a calibration procedure for the 10 MHz oscillator frequency of the NI PXI-6653 and NI PXI-6652 timing and synchronization modules. Contents Conventions .................... 1 Software ....................2 Documentation ..................2 Calibration Interval ................. -
Page 2: Software
When symbol is marked on a product, it denotes a component that may be hot. Touching this component may result in bodily injury. bold Bold text denotes items that you must select or click in the software, such as menu items and dialog box options. Bold text also denotes parameter names. -
Page 3: Calibration Interval
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 PXI-6653 and NI PXI-6652 yearly. You may want to shorten this interval based on the application demands. -
Page 4: Calibration Procedure
Calibration Procedure The steps used in the calibration procedure are as follows: Initial setup. Verification. Adjustment. Reverification. Initial Setup Complete the following steps to set up the NI PXI-665x for calibration. Make sure all components involved in the calibration procedure are powered off. - 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 PXI-665x Calibration Procedure...
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Page 6: Measuring The Frequency
Call niSync Close VI to close the handle. LabVIEW Block Diagram NI-SYNC C Function Call Call with the following niSync_close parameter: SessionHandle “< >” Measuring the Frequency Complete the following procedure to measure the frequency of the onboard clock source. Connect the ClkOut terminal to the PFI 0 terminal by using an SMB-to-SMB cable. - Page 7 Refer to Table 1 for the measurement duration to use. Table 1. Measurement Duration Required Measurement Device Measure Accuracy Duration NI PXI-6652 200 ppb 0.5 seconds NI PXI-6653 1 ppb 100 seconds © National Instruments Corporation NI PXI-665x Calibration Procedure...
- Page 8 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 *SessionHandle Call niSync Measure Frequency VI to measure the frequency of the oscillator.
- Page 9 Table 4. Calibration Target Frequency Ranges Calibration Measurement Target Calibration Frequency Range Measurement Device Accuracy Low Limit High Limit NI PXI-6652 200 ppb 9,999,998 Hz 10,000,002 Hz (TCXO) NI PXI-6653 1 ppb 9,999,999.99 Hz 10,000,000.01 Hz (OCXO) © National Instruments Corporation NI PXI-665x Calibration Procedure...
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Page 10: Adjustment
If the measured value is within the low-limit and high-limit range listed under the Calibration Measurement Target Frequency Range in Table 4, the board is considered to be calibrated and no adjustment is needed. Adjustment If the accuracy of the 10 MHz oscillator is outside the specified range for the product, the device is out of calibration. - Page 11 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 PXI-665x Calibration Procedure...
- Page 12 Call niSync Measure Frequency VI to measure the frequency of the oscillator. LabVIEW Block Diagram NI-SYNC C Function Call Call with niSync_MeasureFrequency the following parameters: SessionHandle “< >” sourceTerminal: NISYNC_VAL_OSCILLATOR duration: actualDuration: *actualDuration measuredFrequency: *measuredFrequency error: *error Call niSync Close VI to close the session handle. LabVIEW Block Diagram NI-SYNC C Function Call Call...
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Page 13: Reverification
After completing the adjustments to the NI PXI-665x, 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 PXI-665x is operating within its test limits. © National Instruments Corporation NI PXI-665x Calibration Procedure... -
Page 14: Where To Go For Support
Corporation. Refer to the Terms of Use section on ni.com/legal for more information about National Instruments trademarks. The mark LabWindows is used under a license from Microsoft Corporation. Windows is a registered trademark of Microsoft Corporation in the United States and other countries.
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