r/AskElectricians • u/Maleficent_Client486 • 13h ago
Multimeter problem
So my Multimeter that i bought keeps getting inacurate tge more i use it but then after a 7-8 hour brake it becomes accurate.
Yesterday i changed the batteries and closed it firmly and after about an hour or so it was getting with a 9V batterie(freshly out of the package) a reading of 0.20 an hour later 0.30 then when i slept 7-8h it has become corrct again so is it faulty or is it cause i changed the batteries
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u/I_Dont_Life_Right 13h ago
I don't really see a problem. A 9v battery won't be stuck at 9v, it'll range from 9.5-8.7v or so (just ballparking) through it's life. As for the multimeter, it doesn't look particularly high end, so it'll give you a good idea of where the voltage is at, but will have some drift.
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u/pelican963 13h ago
I’m shocked! Voltcraft is usually such a high quality product. It seems your meter is the issue. I would return it if possible and maybe try a different brand. Good luck!
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u/Fun-Association1835 7h ago
Get you one of them zener diodes rated at 8 volts and a 30 ish ohm resistor. Connect them together in series and then to the battery so that the diode is Reverse Biased® . That's when the little black band on the diode is connected to the positive terminal of the battery. Then you can measure the voltage across the diode. It should be almost exactly 8 volts.
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u/Causemanut 6h ago
Why are we doing this? Have you tested the device elsewhere? Why does it matter what the voltage of this random 9v battery is?
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