Article: Caution: Watt Meters Not Accurate Outside of Standard Grid Parameters

Lasted edited by Andrew Munsey, updated on June 14, 2016 at 10:03 pm.

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On September 21, 2011, Directory:Karl Palsness wrote:

I just wanted to let you know that I have discovered an important error, a lot of people are making very bad mistakes in making energy measurements. (WHATT's) It is tempting to use something simple such as a “KillaWatt meter” But they have a very dangerous flaws! They are designed to operate with a specific frequency range such as a 60 Hz or 50 Hz and a fixed or narrow band with of voltage. Such as 120V or 240V. If you deviate from the designed frequency or operating voltage you will get MISLEADING measurements. This tool is great device if measuring grid power, but be aware of non standard frequency's or even wave forms.

DON'T LET IT EVER MISLEAD YOU! Use a real measuring tool. I use different types of measuring tools depending on what I am measuring. But I start with trying to run a real known load at it equivalent output to start with. Such as lights, motors, heaters ect....if they don't run to full operational design then there is a problem to start with in using it to make the measurements, such as a miss-mach in impedance. Trying to run a 12V load on a 120V line or 240V load on a 120V line will not work.

Just wanted to make you aware of this common problem.

See also

Directory:Karl Palsness