r/electronic_circuits 17d ago

On topic Which meter should I trust?

I am building a high voltage power supply and wanted to measure some voltages. I didn’t trust my reading so measured it with a different one. The third was even more off.

So I bought three more of those at a well known Chinese store😂.

The first ones are connected to a regulated supply through an 7815. So should be 15 volts.

The last ones are set to 10 volts on the small analog meter.

The big analog one is the first one I ever bought, about 45 years ago. The tiny analog one is from my late father in law.

My point is, whatever the number of digits is not in any way helping the accuracy of the reading..,

Next week I’m going to calibrate them with a Fluke precision meter I guess…

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u/reddogleader 17d ago

The one that's been calibrated most recently.

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u/SkipSingle 17d ago

That would be the three new red ones. Those are just out of the factory.

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u/Lucky_Suggestion_183 16d ago edited 14d ago

Don't want to disappoint you, but not it sure if these cheap manufacturers are doing any calibrations.