Variable resistor potentiometer has different reading when mounted on the board

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  • waigy
    Senior Member
    • Nov 2009
    • 93
    • UK
    #1

    Variable resistor potentiometer has different reading when mounted on the board

    In my fusion FE-402 car amplifier the gain pot is an RK097G.
    I think it is anyway, the RK097G is the closest I've found to the original with the same pin number and dimensions.
    The differences are my pot is blue and has B203 on it and the shaft is plastic with a small slot at the very end only.
    I measured the resistance and found it went from 0 up to 10k so I ordered a 10k pot.
    I then took the pot out the board and it now measured 22k.
    I tried putting it back in the board and it goes back to 10k.
    Is this normal and if so what pot should I order?
    On this amazon page it is available as a 20k and 10k.
    https://www.amazon.co.uk/RELAND-SUN-...0B15MS2MZ?th=1
    Tags: None
    • truclacicr
      Badcaps Veteran
      • Apr 2019
      • 297
      • australia
      #2
      Your pot is 20K. When it is installed in the circuit, there would be other components connected to the same points, and these would reduce the measured resistance. I expect that when the pot is removed you will measure 20K on the PCB. When you parallel the circuit's 20K with the pot's 20K, you get a combined resistance of 10K.

        Comment

        • waigy
          Senior Member
          • Nov 2009
          • 93
          • UK
          #3
          Ok thanks

            Comment

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