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NI TB-9212 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 TB-9212 terminal block using Calibration Executive.

Calibration Executive Procedure Features:

Adjustment

Supported
Manual Mode

Supported
Selectable Test Points

Unsupported

Approximate Test Time: 18 minutes

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

Test Equipment

The following table lists the test instruments required for calibrating the TB-9212.

Instrument Recommended Model Requirements
Thermocouple Calibrator Ectron 1140A If this instrument is unavailable, use a high precision thermocouple source with an accuracy of ≤0.06 °C and an output impedance of ≤10 Ω.
C Series Module NI 9212 An NI 9212 module that is verified to be within product specifications.
Chassis cDAQ-9178
Barrier Strip Assembly Thermocouple Wire TT-E-24-SLE-100 E-type SLE 24 AWG, 20 m to 30 m.
Mini Thermocouple Connector Omega SMPW-E-M E-type, must fit the output terminal of the thermocouple calibrator.
Thermocouple Barrier Strips Omega BS16A 8 channels.
Thermocouple Barrier Strip Jackets (x8) Omega BSJ-E E-type, 8 channels.
Thermocouple Spade Lugs (x32) Omega SLCH-20 16 lugs of chromel to match the E-type wires.
Omega SLCO-20 16 ugs of constantan to match the E-type wires.
Spade-Lug Crimping Tool Omega CRIMPING TOOL-P Must effectively crimp the spade lugs with the 24 AWG wire.

Test Conditions

The following setup and environmental conditions are required to ensure the TB-9212 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 thermocouple wire for all cable connections to the TB-9212.
  • 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 15 minutes to ensure that the NI 9212 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 NI 9212 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 Measurements & Automation Explorer (MAX).
  7. Right-click the device name and select Self-Test to ensure that the device is working properly.

Test Limit Equations

The following test limits are derived from the published specifications.

Temperature Accuracy

ErrorLimits = abs(Tempchannel - TempCJC)

Temperror(TTC, TCJ) = ErrorLimits

Temperror(TTC, TCJ) = TE * [VMEASURED(TTC, TCJ) + VError_MODULE(TTC) + VE(TCJ + TCJ_err)] - TTC

TTC = Thermocouple Temperature, 0 °C

TCJ = Typical Cold Junction Temperature, 23 °C

VMEASURED(TTC, TCJ) = VE(TTC) - VE(TCJ)

VError_MODULE(TTC) = Voltage Error Limit at TTC

TCJ_err = Temperate error range, ±5 °C


 

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