we are trying to measure the wire temperature of a 208V line to line device while its actively pulling current. I want to connect 2 thermocouples, one to each AC line. configuration is line to line, no neutral so 208vac across each leg. I am using an Agilent 34901A 20ch multiplexer card. the data sheet states it has isolated inputs up to 300v but I want to know is anybody else has done this before? I don't want to smoke a $1000 board. see attached drawing
Thanks for your help.