CALIBRATION PROCEDURE
NI USB-443
x
This document contains information about calibrating the National Instruments USB-4431 and
USB-4432. These devices are referred to in this document as NI USB-443x. For more information about
calibration, visit
ni.com/calibration
.
Contents
Software Requirements........................................................................................................................ 2
Documentation Requirements.............................................................................................................. 2
Calibration Interval .............................................................................................................................. 2
Test Equipment .................................................................................................................................... 3
Test Conditions .................................................................................................................................... 4
Calibration Procedures......................................................................................................................... 4
Initial Setup.................................................................................................................................. 4
Changing Coupling on NI USB-443x Devices............................................................................ 5
Verification .................................................................................................................................. 6
AI Offset Verification ................................................................................................. 6
AI AC Coupled Gain Accuracy Verification .............................................................. 7
AI DC Coupled Gain Accuracy Verification .............................................................. 8
AO Offset Verification for the NI USB-4431 Device ................................................ 10
AO Gain Verification for the NI USB-4431 Device .................................................. 11
Analog Input Adjustment..................................................................................................... 13
Analog Output Adjustment for the NI USB-4431 Device................................................... 16
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