ECN Forum Forums General Topics of the Trade General Discussion Area True-rms VS cheaper meter

It's not an "either/or" issue.

For 90% of your meter work, a cheapie will work fine. Then when you are trying to identify harmonics, you will use both to identify the problem.....if the "True RMS" reads more than 10/12% higher than the "cheapie," it is time to start considering harmonics as a problem.