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This topic contains information for calibrating the National Instruments 9218 using Calibration Executive.
Calibration Executive Procedure Features:
||Selectable Test Points
Approximate Test Time:
|Verify & Adjust
|Test Equipment|||||Test Conditions|||||Device Setup|||||Test Limit Equations|
The following table lists the test equipment required for calibrating NI 9218 modules.
|Calibrator||Fluke 5700A||Use a device that can source voltages as high as ±50 V and meets the following specifications:
≤100 ppm gain error.
≤3 µV offset error.
<3 µV offset at voltages less than 60 mV.
<200 mV offset at voltages less than 15 V.
<1 mV offset at voltages less than 60 V.
|DMM (x2)||PXI-4071||Use a DMM with <40 Ω of error at resistances <400 kΩ.
For DMM1, use one DMM with <50 ppm gain error, and <50 µV of offset error at voltages <3.5 V.
For DMM2, use a second DMM with <50 ppm gain error, and <2 µV of offset error at voltages <50 mV.
|Discrete Resistors||—||TCR: <25 ppm/°C
Resistor values: 10 kΩ (2x), 249 Ω
|Measurement Adapters||NI 9982D (x4)*||Use for NI 9218 with DSUB connector.|
|NI 9983D||Use for NI 9218 with DSUB connector.|
|NI 9987D||Use for NI 9218 with DSUB connector.|
|NI 9982L (x4)*||Use for NI 9218 with LEMO connector.|
|NI 9983L||Use for NI 9218 with LEMO connector.|
|NI 9987L||Use for NI 9218 with LEMO connector.|
|* The Bridge Voltage step requires three different connections to the NI 9982. It is recommended that you use four separate NI 9982 measurement adapters, with three of these connections pre-configured for the bridge steps.|
The following setup and environmental conditions are required to ensure the NI 9218 meets published specifications.
The test limits in this procedure are derived from the published specifications found in the NI 9218 Calibration Procedure.
Limits = TestValue ± ((TestValue * Gain Error) + (Offset Error))