[time-nuts] Simple AC mains zero-cross detector
jimlux at earthlink.net
Wed Dec 17 13:15:07 EST 2014
On 12/17/14, 6:46 AM, Chuck Forsberg WA7KGX wrote:
> Seems to me CFLs and other loads switching on and off would affect the
> 60 Hz waveform
> enough to make microsecond measurements meaningless.
folks measure the frequency to tenths of a Hz (albeit not a single cycle)..
0.1 Hz out of 60 Hz is 27 microseconds.
But yes, given the terrible power factor of a lot of consumer loads, I
suspect you could see a change in the phase of the voltage just due to
the IR drop in the feeder and distribution, since the I isn't in phase
with the E.
The 15 year old refrigerator I just got rid of was 200W+ and had a PF of
0.50-0.60, which is pretty bad.
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