In article , Ted Edwards says...

Even if you can shut down _every_ load except the one in question, I
would want to ask just how accurate is the standard house meter at such
light loads. After all, they are concerend with an upper linmit on the
order of 20 or so KW. A few tens or hundreds of watts is a long way
below full scale.

Agree. Really the best way is to use a floating scope
like that scope meter, and a sampling resistor, to
display both current and voltage, and then measure
the phase angle.

Jim

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