[Amps] Volt-watt meter

[m.ford]

Hello Will
    I recently tested a hv xfmr using banks of 100 watt lamps
in series as the load. I measured voltage across one lamp and
multiplied by the number of lamps to obtain the total voltage.
I found that depending on which lamp I measured, the readings
varied considerably.

    I would not put much faith in the "100 watt" rating of a light bulb.

    Hope that helps,

    Mike Ford   k1ern

----- Original Message ----- 
From: "Will Matney" <craxd1 at ezwv.com>
To: <amps at contesting.com>
Sent: Friday, April 22, 2005 10:31 AM
Subject: [Amps] Volt-watt meter


> I have a Simpson volt-watt meter here I'm thinking about getting calibrated. The thing is, I'm not really sure how accurate it is.
After I bought it, I tried it out on a lamp in the house using a 100 watt buld. Something didn't jive about the watt reading when I
calculated the wattage from the line voltage shown as the meter showed a lower wattage. I wonder just how accurate those bulb
ratings are? Simpson is known for good accuracy because of their meter movements, but I'm not too sure about this. I'd like to test
it again before I pay a fortune for calibration on it. I thought of using a transformer but then your not sure what the power
actually is due to losses. I don't have any power resistors large enough handy to at least get a 1/2 scale reading. What might be a
good circuit I'm not thinking of to test this? Note; this meter is designed for power readings on a 120 or 240 Vac line.
>
> Thanks,
>
> Will
>
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