[REPAIR] Multimiter sanwa PC510a strange temperature reading

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  • ss45
    Senior Member
    • Jun 2019
    • 119
    • Brazil

    #1

    [REPAIR] Multimiter sanwa PC510a strange temperature reading

    Hi I have sanwa PC510a multi.
    the temp reading is offset by about -1000 C
    it was fine few months ago and started acting up recently
    so room temp will read ~970 C

    it is not the sensor ( K type) as when I plug to other meter (fluke) it reads just fine
    the sensor is sanwa original

    all other readings like voltage AC&DC, current AC&DC, resistance, diode, and capacitance give normal readings within
    meter's specification.

    I ve tried searching internet for schematic, but no luck so far.
    I guess it has sth to do with the cold junction compensation circuit or sth else, but i am really blind about servicing meter.

    i ve tried cleaning and brushing pcb with alcohol, again no change.

    any help is appreciated.
    thanks
  • Per Hansson
    Super Moderator
    • Jul 2005
    • 5895
    • Sweden

    #2
    Re: [REPAIR] Multimiter sanwa PC510a strange temperature reading

    There is a thermistor inside the meter, probably it is open circuit with a reading like that...
    "The one who says it cannot be done should never interrupt the one who is doing it."

    Comment

    • stj
      Great Sage 齊天大聖
      • Dec 2009
      • 30977
      • Albion

      #3
      Re: [REPAIR] Multimiter sanwa PC510a strange temperature reading

      usually,
      although some chips just have a programamble value in them that assumes 20' ambient.

      Comment

      • ss45
        Senior Member
        • Jun 2019
        • 119
        • Brazil

        #4
        Re: [REPAIR] Multimiter sanwa PC510a strange temperature reading

        @per Hansson
        Yeah it is probable. But the big question is which one

        Heres link to some of the photos
        link

        @stj
        I wonder if only we could reprogram that chip....
        Maybe as the chip becomes older values stored inside it become corrupted. Or in a very unlikely event, stray radiation knocked a bit off of a cell, resulting in error'... Hmmm......
        Last edited by ss45; 06-01-2021, 10:35 AM.

        Comment

        • stj
          Great Sage 齊天大聖
          • Dec 2009
          • 30977
          • Albion

          #5
          Re: [REPAIR] Multimiter sanwa PC510a strange temperature reading

          those meters give "err" on the display if they get corrupted

          Comment

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