NI 9218 Calibration Procedure

Calibration Executive 5.0.2 Help

Edition Date: October 2019

Part Number: 374564U-01

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This topic contains information for calibrating the National Instruments 9218 using Calibration Executive.

Calibration Executive Procedure Features:

Adjustment

Supported
Manual Mode

Supported
Selectable Test Points

Unsupported

Approximate Test Time:

Verify Only
32 minutes
Verify & Adjust
103 minutes
Test Equipment|Test Conditions|Device Setup|Test Limit Equations

Test Equipment

The following table lists the test equipment required for calibrating NI 9218 modules.

InstrumentRecommended
Model
Requirements
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 ResistorsTCR: <25 ppm/°C

Resistor values: 10 kΩ (2x), 249 Ω

cDAQ ChassiscDAQ-9178
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.

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9218 meets published specifications.

  • Keep connections to the device as short as possible. Long cables and wires act as antennas, picking up extra noise that can affect measurements.
  • Verify that all connections to the device are secure.
  • Use shielded copper wire for all cable connections to the device. Use twisted-pair wire to eliminate noise and thermal offsets.
  • Maintain an ambient temperature of 23 °C ±5 °C. The device temperature will be greater than the ambient temperature.
  • Keep relative humidity below 80%.
  • Allow a warm-up time of at least 10 minutes to ensure that the NI 9218 measurement circuitry is at a stable operating temperature.

Device Setup

  1. Install the NI 9218 in slot 8 of the cDAQ-9178 chassis. Leave slots 1 through 7 in chassis empty.
  2. Connect the cDAQ-9178 chassis to your host computer.
  3. Connect the power source to the cDAQ-9178 chassis.
  4. Configure the hardware using Measurement & Automation Explorer (MAX).
  5. Launch the Calibration Executive procedure and complete the setup wizard.

Test Limit Equations

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))

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