NI 9231 Calibration Procedure

Calibration Executive 6.0 Help

Edition Date: July 2020

Part Number: 374564Y-01

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This topic contains information for calibrating the NI 9231 using Calibration Executive.

Calibration Executive Procedure Features:

Adjustment

Supported
Manual Mode

Supported
Selectable Test Points

Unsupported

Approximate Test Time:

Warmup
10 minutes
Verify Only
5 minutes
Verify & Adjust
14 minutes
Test Equipment|Test Conditions|Device Setup|Test Limit Equations

Test Equipment

The following table lists the test equipment required for calibrating NI 9231 modules.

Instrument Recommended Model Requirements
Chassis cDAQ-9178
Calibrator Fluke 5502A, 5522A, or 5730A Use a high-precision voltage source with gain error of <100 ppm and offset error <0.1 mV
BNC (M) to Double Banana Adapter (M) Pomona Electronics 1270
10-32 (M) to BNC (F) Coupler 10-32 Coaxial (M)-BNC Cable (NI part number 786657-01) Characteristic impedance: 50 Ω

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9231 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.
  • 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 device measurement circuitry is at a stable operating temperature.

Device Setup

  1. Make sure the cDAQ-9178 power source is not connected.
  2. Connect the cDAQ-9178 to the system safety ground.
    1. Attach a ring lug to a 14 AWG (1.6 mm) wire.
    2. Connect the ring lug to the ground terminal on the side of the cDAQ-9178 using the ground screw.
    3. Attach the other end of the wire to the system safety ground.
  3. Install the module in slot 8 of the cDAQ-9178 chassis. Leave slots 1 through 7 of the cDAQ-9178 chassis empty.
  4. Connect the cDAQ-9178 chassis to your host computer.
  5. Connect the power source to the cDAQ-9178 chassis.
  6. Launch Measurement & Automation Explorer (MAX).
  7. Right-click the device name and select Self-Test to ensure that the module is working properly.

Test Limit Equations

The following test limits are derived from the published specifications found in the NI 9231 Calibration Procedure.

Accuracy Verification Calculation

Test Limit = TestValue ± (TestValue * (Gain Error)/100 + Range * (Percent of Range)/100)

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