[Beowulf] Kill-A-Watt and PFC

[Jim Lux]

Interestingly, Prodigit (who make the Kill-A-Watt) have a whole webpage 
describing PFC requirements, etc.
http://www.prodigit.com/e307.htm
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:
http://www.prodigit.com/e2000m.htm

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
tel: (818)354-2075
fax: (818)393-6875
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