Thermocouple Instrument Calibaration

Discussion in 'General Electronics Chat' started by softwaremonkey, Aug 9, 2013.

  1. softwaremonkey

    Thread Starter New Member

    Aug 9, 2013
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    I wish to check the calibration of a thermocouple instrument by injecting a voltage taken from the thermocouple reference tables. I have compensating cable from the instrument to a T/C socket where I will be injecting my voltage. I know the cold junction temperature (and therefore equivalent emf), but I think I will have another 'cold' junction where my copper leads from the voltage source connect to the thermocouple socket.

    I tried calculating the emf based on the instrument's cold junction temperature but it was wrong by a few degrees, but if I used room temperature in the calculation the calibration was correct.

    How do I calculate the emf I need, do I need to take into account the second junction I make when I connect my voltage source?

    Hope this makes sense

    Thanks :)
     
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