What is full scale power of the meter?
You could use a precision resistor in series with the load and measure
the voltage across the resistor to get current. However keep in mind
that most ac voltmeters don't do a very good job. If you get with in a
few percent you will be doing good.
73
Gary K4FMX
Will Matney wrote:
> 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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>
>
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