Thermcouple Wire Calibration with a Fluke 753

neoth

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#1
Hi all,

i am calibrating thermocouples wire only and i connect it to a fluke 753 readout.

and i got the results as attached in the picture.

so do i use -1.788mv ~ -47.18°C + Int. Ref. 27.1°C = -20.08°C

or

i just read from the readout which is -18.0°C?

and also why are both values different? thought it should be the same?
 

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