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This topic contains information for calibrating the NI 9235 and NI 9236 using Calibration Executive.
Calibration Executive Procedure Features:
|Adjustment||Manual Mode||Selectable Test Points
Approximate Test Time: 40 minutes
|Test Equipment|||||Test Conditions|||||Device Setup|||||Test Limit Equations|
The following table lists the test equipment required for calibrating NI 9235/9236 modules.
|Calibrator||Fluke 5500A||If this instrument is unavailable, use a calibrator with generation of resistances in the ranges of 108 Ω to 132 Ω and 315 Ω to 385 Ω with 0.01 Ω resolution, an accuracy of at least 90 ppm, and automatic lead wire compensation.|
|DMM||NI 4070||If this instrument is unavailable, use a multi-ranging 6 1/2-digit DMM with an accuracy of at least 40 ppm.|
|Connecting Wires||—||Connections between the module and the calibrator are insensitive to connection resistance except between the calibrator LO terminal and the module RC terminal. The resistance of this connection must be less than 200 mΩ to limit bridge linearity errors. The measurement accuracy verification TestLimits assume this requirement is met.|
The following setup and environmental conditions are required to ensure the NI 9235/9236 meets published specifications.
|Note If the NI 9235/9236 module fails after calibration, return it to NI for repair or replacement.|
The following test limits are derived from the published specifications found in the NI 9235/9236 Calibration Procedure.
TestLimits = NominalValue ± AbsoluteAccuracy
AbsoluteAccuracy = NominalValue * GainError + Range * OffsetError