[Beowulf] Kill-A-Watt and PFC
James.P.Lux at jpl.nasa.gov
Wed Sep 28 14:47:10 PDT 2005
Interestingly, Prodigit (who make the Kill-A-Watt) have a whole webpage
describing PFC requirements, etc.
on which they say:
Accurate digital power meter model 4010/4011 simultaneously digitally
sampling the voltage and current waveform, according to RMS, watt and PF
theory, using microprocessor to compute 0.1% accuracy's RMS voltage,
current watt and <0.002 accuracy's power factor, it is highly accurate and
consistent under the widest voltage and current range, this is the most
accurate and reasonable price's power meter in the market.
That's their upscale unit..
Here's the consumer model:
I believe that the consumer device uses basically the same technique
(sampling V and I at a reasonably high rate, multiplying and calculating..)..
James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
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