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Old 05-31-2021, 05:02 AM   #1
ss45
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Default [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
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Old 05-31-2021, 12:25 PM   #2
Per Hansson
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Default 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...
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Old 06-01-2021, 03:09 AM   #3
stj
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Default Re: [REPAIR] Multimiter sanwa PC510a strange temperature reading

usually,
although some chips just have a programamble value in them that assumes 20' ambient.
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Old 06-01-2021, 10:33 AM   #4
ss45
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Default 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 at 10:35 AM..
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Old 06-01-2021, 02:18 PM   #5
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Default Re: [REPAIR] Multimiter sanwa PC510a strange temperature reading

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