Hi again

Problem solved. It was correct to connect the terminal boards to earth. We had done it wrong previously and I got confused.

Hi Hatesh. Thanks for answering I have tried that but it doesn't help. Below is the result of some of the measurements I did when trying to fix this. I will look into this more tomorrow, and it would be great with some advice. With no earthing I get the following readings when both terminal boards a...

Battywoo: did it fix your problem? I have the same issue. If i put in the single channel terminal board and measure voltage (0-5V) the thermocouple readings go crazy. If I then connect the terminal board to ground the thermocouples are good but the voltage measurement is wrong (more than if not grou...