[time-nuts] Simple AC mains zero-cross detector

Chuck Forsberg WA7KGX caf at omen.com
Wed Dec 17 09:46:24 EST 2014

Seems to me CFLs and other loads switching on and off would affect the 
60 Hz waveform
enough to make microsecond measurements meaningless.

On 12/17/2014 01:03 AM, Charles Steinmetz wrote:
> Hal wrote:
>> What are you going to do with data from the line accurate to 1 
>> microsecond?
> Me?  Nothing.  I don't find the meanderings of the mains frequency all 
> that interesting, aside from observing them from time to time via the 
> sweep second hand of a synchronous wall clock.  But lots of other 
> folks do (including our fearless leader, tvb), and they like being 
> able to correlate grid events to single-digit uS (lightning strikes, 
> sections of the grid going out, etc.).  That said, I didn't slave away 
> trying to get the ZCD jitter below 1uS -- I anticipated that it would 
> be, just because there's nothing in the design to prevent it, so I 
> wasn't surprised when it worked out that way.
> Best regards,
> Charles
> =========================
> Everything works if you let it.
>      Corpus C. Redfish
> =========================
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      Chuck Forsberg WA7KGX   caf at omen.com   www.omen.com
Developer of Industrial ZMODEM(Tm) for Embedded Applications
   Omen Technology Inc      "The High Reliability Software"
10255 NW Old Cornelius Pass Portland OR 97231   503-614-0430

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