[time-nuts] Mains frequency
Magnus Danielson
magnus at rubidium.dyndns.org
Sun Nov 17 02:47:05 UTC 2013
On 11/17/2013 03:33 AM, Chris Albertson wrote:
> Again, why are you measuring the AC line? I'd think maybe to measure the
> noise that is on it. The fundamental freq. changes second by second.
> It's not a clean 60Hz my any means. The rate of frequency change is one
> thing you'd like to measure
>
> I was just watching a minute ago and can see a 0.01Hz/second drift. It is
> likely MUCH worse as what I was watching is filtered over second
The phase of it tells you a lot about the powergrid, especially when you
collect data over the full power-grid and at sufficiently high rate.
Cheers,
Magnus
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