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Thread: thermistor cable lengths

  1. #1

    Default thermistor cable lengths

    What should be taken into account when you want to lengthen the cables of a thermistor? I need around 50 cm from my 10K thermistor to my laser driver.

  2. #2
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    If projector is all metal, and thus crudely shielded, not much. If all plastic, other rules apply. If wire is coming out of a metal projector into a plastic region where it could be exposed to cell phone radiation or the RF hash of a night club, then run a two conductor shielded wire with shield to case ground. Only ground the shield at ONE end of the cable, leave the other floating. (Yep, I said case ground, its a dc-low frequency signal, not a differential galvo signal, Case is just fine)

    Steve
    Last edited by mixedgas; 04-11-2017 at 10:23.
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  3. #3

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    It's metal (steel + aluminum), but just to be on the safe side I can do that. Is this a general rule of thumb for all signal cables or special care taken with therimstor cables?

  4. #4
    mixedgas's Avatar
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    There is a whole art to grounding projectors. I see you have opened another thread...
    In the case of the thermistor, ANY shielding is usually more then enough as the thermistor is a current based signal, not a voltage based one.. Plus the rate of signal change is on the order of seconds or tens of seconds. That long term decision making process tends to average out 50/60 Hz noise.

    Steve
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  5. #5

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    Thanks, Steve.

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