National Instruments NI 4070/4072 6 1/2-Digit FlexDMM 用户手册

This document contains step-by-step instructions for writing an external 
calibration procedure for the National Instruments PXI/PCI-4070 and 
NI PXI-4072 digital multimeters (DMMs). Each of these 
National Instruments DMMs is a 6½-digit FlexDMM and 1.8 MS/s 
isolated digitizer. For more information on calibration, visit 

ni.com/

calibration

.

Conventions ............................................................................................ 2
Software Requirements ........................................................................... 2
Documentation Requirements................................................................. 3

Password ................................................................................................. 3
Calibration Interval ................................................................................. 4
Test Equipment ....................................................................................... 4

Required Test Equipment ................................................................ 4
Optional Test Equipment ................................................................. 5

Test Conditions ....................................................................................... 5
Calibration Procedures ............................................................................ 6

Initial Setup...................................................................................... 6
Verification Procedures ................................................................... 7
Adjustment Procedures .................................................................... 41

DC Voltage ...................................................................................... 58
AC Voltage ...................................................................................... 59
4-Wire Resistance ............................................................................ 61
2-Wire Resistance ............................................................................ 61
DC Current....................................................................................... 62
AC Current....................................................................................... 62
Frequency......................................................................................... 63
Capacitance and Inductance............................................................. 63

Appendix A: Calibration Options ........................................................... 64
Where to Go for Support......................................................................... 68