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 ...
Forum Discussion
Really, just how accurate do you need? I calibrated electronic instruments for decades. First you need a known good reference such as a meter that has been recently calibrated. Then you need a voltage source so you can see the meter under test and your reference at the same time.
The very simple way is to set the needle to be right on the mark for the voltage you have. It will then be accurate there, but not necessarily accurate in the rest of its range.
You can check at several places on the scale to get an idea just how accurate it can be overall. This may be only what you need.
The very simple way is to set the needle to be right on the mark for the voltage you have. It will then be accurate there, but not necessarily accurate in the rest of its range.
You can check at several places on the scale to get an idea just how accurate it can be overall. This may be only what you need.
