NI 9213 TCs with voltages present

[Grungebob]

We have a new NI-DAQmx and two NI 9213 TC input modules.  Need to monitor Temps on several active devices.  In this AC-to-DC conversion module there could be voltages on the order of up to 60VAC or 150VDC on the Drain of a MOSFET.  Would physically attaching Thermocouples to these live voltages cause any issue at the NI 9213 input, or do they need to be electrically isolated? 

[Mr.F · Accepted solution]

Hi Bob,

The overprotection voltage for that module is listed at 30 V between any two inputs. Voltages in the range you mention have the potential to damage the card. You’ll have to electrically isolate those voltages from your NI 9213 module.