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NI 9205/9206 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 9205 and National Instruments 9206 using Calibration Executive.

Calibration Executive Procedure Features:

Adjustment

Supported
Manual Mode

Supported
Selectable Test Points

Unsupported

Approximate Test Time: 5 minutes

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

Test Equipment

The following table lists the test equipment required for calibrating NI 9205/9206 modules.

InstrumentRecommended
Model
Requirements
CalibratorFluke 5700AIf this instrument is unavailable, use a high-precision voltage source with an accuracy of at least 10 ppm.
ChassiscDAQ-9178
Connection AccessoryNI 9940Use with NI 9205/9206 modules with screw terminal.
NI 9933Use with NI 9205/9206 modules with DSUB.

Test Conditions

The following setup and environmental conditions are required to ensure the NI 9205/9206 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 9205/9206 measurement circuitry is at a stable operating temperature.

Device Setup

  1. Install the NI 9205/9206 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 9205/9206 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 9205/9206 Calibration Procedure.

Accuracy

TestPoints = TestValue ± (TestValue * GainError + Range * OffsetError + NoiseUncertainty)

GainError = ResidualAIGainError + GainTempco * (TempChangeFromLastInternalCal) + ReferenceTempco * (TempChangeFromLastExternalCal)

OffsetError = ResidualAIOffsetError + OffsetTempco * (TempChangeFromLastInternalCal) + INL_Error

NoiseUncertainty = RandomNoise * 3 / for a coverage factor of 3 Σ and averaging 100 points


 

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