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National Instruments Corporation
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Contents
Chapter 1
Introduction—Document Scope
Internal Adjustment .........................................................................................1-1
External Adjustment........................................................................................1-1
Why Should You Calibrate?............................................................................1-2
How Often Should You Calibrate?..................................................................1-2
Test Equipment................................................................................................1-2
Software...........................................................................................................1-3
Writing Your Calibration Procedure.................................................1-3
Documentation ................................................................................................1-5
Test Conditions................................................................................................1-6
Initializing Device for Verification................................................................................2-3
Verifying DC Offset ......................................................................................................2-3
Verifying Amplitude Accuracy .....................................................................................2-4
Verifying Amplitude Flatness over Frequency..............................................................2-5
Verifying Total Harmonic Distortion and Spurious Free Dynamic Range ...................2-8
Verifying Device Oscillator Frequency Accuracy.........................................................2-10
Setting Up and Configuring Your Device .......................................................3-1
Adjusting Your NI 54
Procedural Overview ...........................................3-4
Finding the Low Frequency Characteristics
of the Analog Channel ...................................................................3-5
Determining the Value of the On-Board
High-Precision Voltage Reference.................................................3-17
Determining the Frequency Response across the Passband..............3-19
Determining the SYNC Duty Cycle Constants.................................3-21
Determining the VCXO Calibration Constants ................................3-25