Electrical – Do I have a true rms meter


I bought an Excel XL 830L multimeter with the understanding that it was a RMS voltmeter.

I also have UEI ElectroMate DM 200.

When I checked the output of my APC unit with both meters, the readings were about the same.

Is there a way to tell if a meter is an RMS type?

Best Answer

Please see this link :http://www.testequipmentdepot.com/uei/digital-multimeters/dm200.htm

The meter is a discontinued model also available from Ebay. It is NOT a true RMS meter so non-sine waves will give a ambiguous reading at best. Usually a non-RMS meter will see only the most peak voltage present and not the true average.

If you want an excellent true RMS DVM stay with a known good manufacture like Fluke. The Fluke 87 III series is $400 USD, but it is top dog for accuracy.