# 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?

• Do you not have a spec sheet from the manufacture that spells out those details? Also DVM's with a true RMS reading will often have that by the AC volts selector switch. – Sparky256 Feb 3 '18 at 0:39
• Do you have a known square wave source? – jonk Feb 3 '18 at 0:44

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. • So, this is probably a non-RMS meter? walmart.com/ip/… – fixit7 Feb 3 '18 at 2:36 • The link looks like a good choice. The difference between a good RMS meter and a great one is long-term stability. How accurate will it be 5 years from now. Fluke uses EEPROMs for long term storage of calibration values due to aging and extreme temperatures. The TEK DVM for$34 USD would be lacking such expensive add-ons. – Sparky256 Feb 3 '18 at 2:55