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I have a lamp controller hooked to the halogen lamp standard by my desk.
I turned the light well down to a round current reading, and read the
following parameters from the inexpensive "Kill-a-watt 4400"
meter (Cheesy name! <$20)
Volts 122.4V
Amps 2.00 A
watts: 158W
va: 245 voltamps
Fx: 59.9 Hz
p.f. 0.64
Turned high, I read:
Volts: 122.2V
Amps: 2.48A
watts: 293W
va: 303 va
Fx: 59.9 Hz
p.f. 0.96
These look plausible for a microprocessor with an A/D that samples
reasonably fast.
Hmmm....how would I check, without a calibrated wattmeter to hand?
Oh, I know: warm a fluid sample at high pf and another at low pf and check
if the delta t is proportional to indicated power input? :-)