Thanks for feedback. I have found out that the problem was related to the power supply driving the circuit on which I am measuring the voltage. It was of a switching type, and when I changed to another switching power supply of anothe r type/brand the problem disappeared. Then TC-08 is connected to ...

When I try to connect the single channel terminal board I notice two things: 1. Just wiring the GND terminal makes other TC channels go crazy. The GND terminal is connected to a Power supply. I have checked that the supply is connected to same mains outlet as the computer with TC-08. Also tried to c...