Voltage less than 5v, all three loops set up exactly the same on seperate transformers and controllers to measure three seperate loops. I have disconnected the controller thermocouple and all works well, as soon as i reconnect it alls not well, controller thermocouple switches in transformers to gen...

We have three TC-08 usb dataloggers running, each has several thermocouples connected and one module each for mv logging from a CT with mv output. We use Transformers to create current flow in each of the three loops and thus monitor current with the mv signals and temperature at intervals eleswhere...