I would like to measure the temperature of a metal surface, which is under external voltage. For the temperature measurement I use a thermocouple connected to a C Series Temperature Input Module module
in a CompactRIO Chassis. Over a specific voltage level connected to the measured surface, the result of the temperature measurement changes suddenly exactly to 0°C.
I also get an error message from LabVIEW with the Error Code -65583 and the following message:
CompactRIO: (Hex 0xFFFEFFD1) A common-mode range error was detected.
What may cause this faulty measurement?