[time-nuts] Mains frequency

[Magnus Danielson]

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