My wires are at maximum 55' and at minimum 25'. What exactly should I be
looking for when I connect the 10k resistor? 

If I do have a common mode error, how would I resolve this issue? This
is a new theory that I have not considered, thanks.

Rachid

 

>You may have a common mode error added by the long wires (how long are
those wires?).

>Connect a 10K resistor on any of the termocouple end to your measuring
sistem ground and see what's hapenning...

 

 

 

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