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May 2003
370532B-01
NI PXI-4070 6½ Digit FlexDMM
Calibration Procedure
This document contains step-by-step instructions for writing an external
calibration procedure for the NI PXI-4070 6½ digit FlexDMM and
1.8 MS/s isolated digitizer (NI 4070).
Contents
Conventions ............................................................................................ 2
Calibration Overview.............................................................................. 3
What Is Calibration? ........................................................................ 3
Why Should You Calibrate? ............................................................ 3
How Often Should You Calibrate? .................................................. 4
What Calibration Options Are Available?....................................... 4
How Much Time Does Calibration Require? .................................. 4
Equipment and Other Test Requirements ............................................... 5
Required Test Equipment ................................................................ 5
Optional Test Equipment ................................................................. 5
Test Conditions ................................................................................ 5
Documentation................................................................................. 6
Software ........................................................................................... 7
Verification Procedures........................................................................... 10
Setting Up the Test Equipment........................................................ 10
Verifying DC Voltage...................................................................... 11
Verifying AC Voltage...................................................................... 19
Verifying 4-Wire Resistance ........................................................... 27
Verifying 2-Wire Resistance ........................................................... 29
Verifying DC Current ...................................................................... 34
Verifying AC Current ...................................................................... 36
Verifying Frequency ........................................................................ 38
Adjustment Procedures ........................................................................... 40
Setting Up the Test Equipment........................................................ 40
Adjusting DC Voltage and Resistance............................................. 41
Adjusting AC Voltage (AC- and DC-Coupled) Modes................... 47
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