[time-nuts] 60Hz zero-crossing

Chris Albertson albertson.chris at gmail.com
Sun Jul 3 17:39:42 UTC 2011


On Sun, Jul 3, 2011 at 8:57 AM, Tom Van Baak <tvb at leapsecond.com> wrote:

>
> At first this sounds a bit bold. I mean, there's lots of noise on the power
> line. Sometimes horrible spikes and all that. Surely, at some point a
> cheap counting circuit is going to be confused.

What makes is easy are two things
(1)  the huge amplitude of the signal to be measured.  It's 120 (or
240) volts.  This just completely swaps out anything like EMI.
(2) the frequency is so low that software has no trouble looking at
every cycle in real time


Chris Albertson
Redondo Beach, California




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