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Topic: Multimeter shows 3x actual voltage (Read 1 time) previous topic - next topic

crebble

hey people,

since I measured a cap my multimeter has been showing the wrong values for volt. a full 1,5V AA battery shows around 6,5V and a 9V battery shows around 25~30V.

I took the meter apart but can't see any immediate damages or shorts.

Does anyone know what is actually wrong with it?

robtillaart


does it show this factor on every selection? or 0-10V only?
Do you have a schematic of your voltmeter?
Rob Tillaart

Nederlandse sectie - http://arduino.cc/forum/index.php/board,77.0.html -
(Please do not PM for private consultancy)

retrolefty

Probably 'cooked' one of the input voltage divider ranging resistors, but other failure modes are possible. Time to get a new meter. The best digital multimeter have pretty good input protection circuitry up to the maximum rated input voltage. Do you have link to your specific meter?

Lefty

stoopkid

I friend a cheap multimeter and it unfortunately just gave me incorrect readings rather than any kind of indication that it was broken.

retrolefty


I friend a cheap multimeter and it unfortunately just gave me incorrect readings rather than any kind of indication that it was broken.


?

stoopkid


crebble


Y'heard me!


I like your style.

Anyway, the multimeter is a HoldPeak HP-760B

Also, I have an older one that has the same problem (also tried measuring a cap with it..), it doesn't have a model or brand name though.
I've taken them both apart, to see if any resistors are burnt or any other damages are visible. No luck so far.

Shame really, I liked the HoldPeak Multimeter.

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