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Off Topic -Power meter calibration

 
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klehman(at)albedo.net
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PostPosted: Sun Jan 22, 2006 7:00 pm    Post subject: Off Topic -Power meter calibration Reply with quote

Might be easier to use one or more radiant electric heaters and measure
the current if you have an AC ammeter. For radiant heaters without fans,
amps times current equals watts. I'd expect the result to be within
about 5%. With a digital meter that only displays whole kilowatt hours
you probably have to start timing when it changes a digit.

Lots of folks have far higher residual current draw than they think.
About 5 watts for every clock, VCR, microwave, etc, etc, begins to add
up. I've seen large screen TV's that draw 20 watts when off which means
that like most VCR's they use far more energy between uses than they do
when actually turned on.

Ken

do not archive

Bob White wrote:

Quote:

* Get 10 140 ohm 150W resistors
* Wire them in parallel so that you can plug them into a 120V outlet
* turn off everything in the house (Make sure the wheel below the dials
is not moving at all.
* Plug in your resistor array.
* Wait an hour and see if the dial has moved by one kilo watt-hour.

You will be pulling about 8.5 Amps, so any 15A circuit should be OK.

Don't electrocute yourself, and remember those resistors will get HOT.
Each resistor is dissipating 100 watts. You could also use 10 100 watt
lamps, or if you don't mind waiting longer one 100 W lamp will give you
1 KWH in 10 hours.

Bob W.

Do not archive
On Sun, 22 Jan 2006 17:23:22 -0500
<bbradburry(at)allvantage.com> wrote:



>
>
>Sorry about being off subject, but does anyone know how the power meter on a
>residence could be checked for calibration? The power company tells me not
>to worry...The meter is correct...HA!
>I am pretty certain that is not true.
>
>Also I wonder if the new radio reporting meters can have their calibration
>changed via radio???
>
>Thanks for any assistance..
>
>BB Shott from Vinita
>
>
>
>
>
>
>




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