When using a test set to test an EGT thermocouple circuit
- no compensation for ambient temperature is required
- only consider ambient temperature compensation if the ambient temperature is over 20oC
- always compensate for ambient temperature
Explanation from PART66Online
A thermocouple test set generates a known reference temperature (or simulates a calibrated EMF) and contains its own cold-junction reference within the instrument. Because the reference is built in, the technician does not separately compensate for ambient temperature when testing the EGT circuit. Ambient compensation is handled internally regardless of the surrounding temperature.
Indrajith asked · 5 Dec 2012
Always compensate for ambient temperature....
To test the system the test set has to be trimmed for ambient temperature,as the system when in operation is adjusted for ambient temperature by the compensating resistor.This is stated in B 737 AMM.
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