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cFP-RTD-122/124 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 cFP-RTD-122/124 using Calibration Executive.

Calibration Executive Procedure Features:


Manual Mode

Selectable Test Points


Approximate Test Time: (cFP-RTD-122) 8 minutes, (cFP-RTD-124) 4 minutes

Test Equipment|Device Setup|Specifications|Test Limit Equations

Test Equipment

The following table lists the test equipment required for calibrating cFP-RTD-122/124 modules.

Instrument Recommended ModelRequirements
Precision ResistorsFor the cFP-RTD-122, use four precision resistors (330 Ω, 100 Ω, 3.3 kΩ, 1.0 kΩ) with 0.025% tolerance.
For the cFP-RTD-124, use two precision resistors (100 Ω, 330 Ω) with 0.05% tolerance.
Connector BlockcFP-CB-1A connector block for wiring.
cFP BackplanecFP-CALA cFP network interface designed for calibrating I/O modules.
Power SupplyUse an 11–30 V power supply.
Serial CableUse an RS-232 serial cable.

Device Setup

Build the Compact FieldPoint bank as shown in the following figure.

  1. Install the FieldPoint module under test in slot 1 of the cFP-CAL network interface.

    FieldPoint module

  2. Install the cFP-CB-1 connector block in the network interface adjacent to the module under test.

    cFP-CB-1 connector block

  3. Connect the FieldPoint bank to the host computer using an RS-232 cable.
  4. Set the appropriate baud rate.
  5. Connect the positive wire of the power supply to the first V terminal of the cFP-CAL. Connect the negative wire of the power supply to the first C terminal of the cFP-CAL.

    power supply

  6. Launch the Calibration Executive procedure and complete the setup wizard.
  7. Make the connections shown in the first connection dialog box.
  8. While the Calibration Executive procedure runs, you are prompted to make additional connections. Follow the onscreen instructions at each prompt.
Note Note   If the FieldPoint module fails after calibration, return it to NI for repair or replacement.


The following specifications apply to the cFP-RTD-124.

Resistance accuracy at an ambient temperature of 23 ±5 °C:

  • Offset error—0.029 Ω typical, 0.03 Ω max
  • Gain error—0.031% typical, 0.04% max

Test Limit Equations

The following test limits are derived from the published specifications.

Resistance In

TestLimits = TestValue ± (TestValue * Gain Error + Offset Error)


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