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    Temp readings jump to 2000c

    Duet Hardware and wiring
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    • Loffy770
      Loffy770 last edited by

      I have connected my Thermocouple that I bought with my Duet Wifi.
      It did read the temp ok but now it has started to jump between actual temp and 2000c in the readout.
      What can be wrong with the readings?

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      • dc42
        dc42 administrators last edited by

        The output from a thermocouple is only a few tens of microvolts per degC. That makes the thermocouple wiring very susceptible to interference, especially inductive interference. The thermocouple wires should be twisted pair all the way back to the adapter board, and you should keep them away from all stepper motor wires. If the reading stabilises when you send M18 to turn all the motors off, that confirms that you are getting interference from stepper motor wiring.

        A bad connection to the thermocouple wires is another possibility.

        Duet WiFi hardware designer and firmware engineer
        Please do not ask me for Duet support via PM or email, use the forum
        http://www.escher3d.com, https://miscsolutions.wordpress.com

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        • Loffy770
          Loffy770 last edited by

          Well that is most likely the case as I did put it in the cable chain.
          Will try again with it on the outside.
          Thanks for the help.

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