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ColdFusion85
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I recently made a Type K thermocouple (Chromel-Alumenel type) and am trying to see if it is working correctly. I do not have the necessary equipment or time to use cold junction compensation, so I was told by my professor to just test the temperatures and voltage readings at room temperature (20 degrees C), in ice water (0 degrees C), and in liquid nitrogen (should be about -196 C). I got correct readings for room temp and ice water but for liquid N2 i got -156 C. What are the possible sources of error that could cause this TC to work correctly at room and ice temps, but not at much lower temps such as N2?