Calibrate the NI 9202 (DSUB and screw terminal) using Calibration Executive.

Calibration Executive Procedure Features

Verify Only Verify & Adjust Manual Mode Optional Adjust

Approximate Test Time

Verify OnlyVerify & Adjust
4 minutes 8 minutes

Test Equipment

The following table lists the test equipment required for calibrating NI 9202 modules.

Table 10. Test equipment for calibrating the NI 9202
Instrument Recommended Model Requirements
Calibrator Fluke 5500A Use a high-precision voltage source with a gain error of <57 ppm and an offset error of <2 mV.
Chassis cDAQ-9178 —
Terminal Block* NI 9923 —
Note *The NI 9923 terminal block is used only for the DSUB variant.

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9202 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 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 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.

When using Fluke 55xx calibrators, the earth ground option is enabled by software during execution. If you use a 57xx calibrator with this procedure, make sure that the external ground is connected to the guard connector.

Note If the NI 9202 module fails after calibration, return it to NI for repair or replacement.

Test Limit Equations

The following test limits are derived from the published specifications found in the NI 9202 Calibration Procedure.

TestLimit = TestValue ±(TestValue × GainError (%) + Range × Percent of Range (%))