Hi I have a circuit board which has inputs for two thermoucouple K_type clamps. They are fed into two seperate INA126 amplifiers that run off +5V. The front end is biased to 2.5 volts to keep the circuit in the common mode range. Both circuits work fine when used seperately, however when both clamps are connected to a pipe for example the circuits interfere with each other and I get erronious results. Does anyone have a solution to this problem? I imagine its a common problem when two thermocople inputs are required.
Thanks