Unexpected Thermocouple Measurements with myRIO

Updated Dec 21, 2017

Reported In

Hardware

  • myRIO-1900
  • myRIO-1950

Issue Details

I connect the thermocouple directly with myRIO AI channel, but the temperature measurement value is always around +/- 0.01, which is much smaller than 1, even put the thermocouple into boiling water.

Solution

To use thermocouple with myRIO, it needs some external circuit to make it work, which depends on the thermocouple you use. Usually thermocouple needs some signal conditioning for the signal processing, like amplifier for example.

Also, since the electrical signal of thermocouple is small, you may need to confirm the voltage sensitivity in the specification of your thermocouple meets the needs of myRIO.

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