How do I Calibrate a volt meter?
I have couple cheap volt meters. They don't give show the same numbers. Any ideas how to calibrate? I'm not sure of a cheap and good way. Maybe something that plugs into 120 and then inverts to ...
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I use a regulated power supply. A battery will get you in the ball park, too. I have meters that I trust so comparing cheap meters to that measuring tool is what I do. I have a Fluke clamp meter that has a calibration function but is more a 0 balancing than a true calibration.
I've used the $3 Harbor Freight meters to set rail voltages and biasing in better audio amplifiers. I've found them to be fairly accurate. I usually double the measurement with a Fluke to verify accuracy but the HF meters are never much off. For me, it's a cheap solution for using multiple meters in that electronic setting.
Relying on utility 120V is a poor base for accuracy. My power at the house is usually on the high side, running from 123V to 125-6V.
I've used the $3 Harbor Freight meters to set rail voltages and biasing in better audio amplifiers. I've found them to be fairly accurate. I usually double the measurement with a Fluke to verify accuracy but the HF meters are never much off. For me, it's a cheap solution for using multiple meters in that electronic setting.
Relying on utility 120V is a poor base for accuracy. My power at the house is usually on the high side, running from 123V to 125-6V.
