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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

/CVI

, and Microsoft Visual C++. When you install the 

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

.

Summary of Contents for PXIe-6674T

Page 1: ...vironments ADEs and programming languages including LabVIEW LabWindows CVI and Microsoft Visual C When you install the drivers you need to install support for only the ADE or programming language you...

Page 2: ...temperature of approximately 23 C 5 C Keep relative humidity below 80 percent Use shielded copper wire for all cable connections to the device Ensure the NI PXIe 6674T has been continuously powered f...

Page 3: ...Installation Guide for details about configuring the PXI Express equipment Verification The following steps outline the procedure for measuring the 10 MHz oscillator frequency on the NI PXIe 6674T and...

Page 4: ...unction Call Call niSync_SetAttributeViBoolean with the following parameters vi SessionHandle terminalName attributeID NISYNC_ATTR_CLKIN_USE_PLL attributeValue VI_FALSE LabVIEW Block Diagram NI SYNC C...

Page 5: ...handle for the device b Call niSync Measure Frequency VI to measure the frequency of the oscillator Table 1 Measurement Duration Device Measure Accuracy Required Measurement Duration NI PXIe 6674T 0...

Page 6: ...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 LabVIEW Block Diagram NI SYNC...

Page 7: ...ives a frequency as close as possible to 10 MHz 1 Complete steps a to c to set the oscillator control voltage The range of acceptable voltage values is 0 0 V to 4 095 V with frequency increasing as vo...

Page 8: ...ency range for your module as shown in Table 3 Adjustment Target Frequency Ranges Adjust the oscillator control voltage up to increase the frequency and down to decrease the frequency 5 Commit the cal...

Page 9: ...e 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: ...ur complete resource for technical support At ni com support you have access to everything from troubleshooting and application development self help resources to email and phone assistance from NI Ap...

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