You could try and see whether the unit is picking up the interference or the thermocouple leads. (E.g. run the oven up to temp that causes problems, with unit in normal position but leads not in the oven â€“ are the readings affected?) If the unit, it could be placed in a grounded metal box. Screened thermocouple leads are available, but not easily connected to ground at the TC-08 end.
An extreme possibility would be to put the TC-08 in a grounded metal box, and use screened TC leads connected to the grounded metal box.
Ultimately the TC-08 is not rated for such extreme EMI prone applications.
Hope this helps.
THe only way that I finally solved my problem was to attach a capacitor to the positive leg on the output of each thermocouple to ground. I used Al caps which take the heat fairly well. about 50 Micro F 100 wvac seemed to do the trick. Good luck with yours.
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