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CALIBRATION PROCEDURE

NI PXI-665

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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 ................................................................................. 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

Conventions

The following conventions apply to 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.

This icon denotes a note, which alerts you to important information.

When symbol is marked on a product, it denotes a warning advising you to 
take precautions to avoid electrical shock.

Summary of Contents for NI PXI-665 Series

Page 1: ...g the Clock Source 4 Measuring the Frequency 6 Adjustment 10 Reverification 13 Where to Go for Support 14 Conventions The following conventions apply to this document The symbol leads you through nest...

Page 2: ...ns 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 LabWin...

Page 3: ...the NI PXI 665x in Slot 2 of the PXI chassis The calibration procedure requires features of PXI that are accessible only in slot 2 Use of an NI PXI 1044 or NI PXI 1045 chassis is recommended to reduc...

Page 4: ...e driver and application software is installed on the host computer 5 Configure the hardware properly with Measurement Automation Explorer MAX Refer to the NI PXI 665x Installation Guide for details a...

Page 5: ...tion Call Call niSync_init with the following parameters resourceName Dev1 idQuery NULL resetDevice VI_TRUE vi SessionHandle LabVIEW Block Diagram NI SYNC C Function Call Call niSync_SetAttributeViBoo...

Page 6: ...nc Initialize VI to set up a handle for the device b 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_clo...

Page 7: ...on must be made sufficiently long Refer to Table 1 for the measurement duration to use LabVIEW Block Diagram NI SYNC C Function Call Call niSync_ConnectClkTerminals with the following parameters vi Se...

Page 8: ...agram NI SYNC C Function Call Call niSync_init with the following parameters resourceName Dev1 idQuery NULL resetDevice VI_FALSE vi SessionHandle LabVIEW Block Diagram NI SYNC C Function Call Call niS...

Page 9: ...r period following a calibration Table 2 One Year Test Limits Device Specified Accuracy Aging Acceptable Frequency Range As Found Low Limit High Limit NI PXI 6652 TCXO 3 5 ppm 9 999 965 Hz 10 000 035...

Page 10: ...plete steps a 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 voltage increases Use a control voltage of 2 0475 V which...

Page 11: ...quency section To obtain an accurate measurement for calibration the measurement duration must be made sufficiently long Refer to Table 1 Measurement Duration for the measurement duration to use Compl...

Page 12: ...Ranges 5 Commit the calibration values to the Calibration EEPROM using the following procedure a Call niSync Initialize External Calibration VI to initialize the process Note NI is the default user p...

Page 13: ...on section Re verifying after making the adjustments ensures that the NI PXI 665x is operating within its test limits LabVIEW Block Diagram NI SYNC C Function Call Call niSync_InitExtCal with the foll...

Page 14: ...s National Instruments corporate headquarters is located at 11500 North Mopac Expressway Austin Texas 78759 3504 National Instruments also has offices located around the world to help address your sup...

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