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NI 9237 Calibration Procedure

Calibration Executive 4.0 Help

Edition Date: March 2017

Part Number: 374564H-01

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This topic contains information for calibrating the National Instruments 9237 using Calibration Executive.

Calibration Executive Procedure Features:


Manual Mode

Selectable Test Points


Approximate Test Time: 6 minutes

Test Equipment|Test Conditions|Device Setup|Test Limit Equations

Test Equipment

The following table lists the test equipment required for calibrating NI 9237 modules.

CalibratorFluke 5700AIf this instrument is unavailable, use a high-precision voltage source with an accuracy of at least 10 ppm and an output impedance of ≤ 50 Ω.
DMMNI 4070If this instrument is unavailable, use a multiranging 6 1/2 digit DMM with an accuracy of at least 40 ppm.
Cable RJ-50 cable
Bridge Completion Accessories NI 9949,
350 Ω resistors
Use one NI 9949 screw terminal accessory and two 350 Ω resistors with at least 1% tolerance.

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9237 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.
  • 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 9237 measurement circuitry is at a stable operating temperature.

Device Setup

  1. Install the NI 9237 in slot 8 of the cDAQ-9178 chassis. Leave slots 1 through 7 on the cDAQ-9178 chassis empty.
  2. Configure the hardware using Measurement & Automation Explorer (MAX).
  3. Launch the Calibration Executive procedure and complete the setup wizard.
Note Note  If the NI 9237 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 9237 Calibration Procedure.


TestLimits = TestValue ± (TestValue * GainError + OffsetError)


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