[sdiy] A Frequency Standard for Poor People?

[harrybissell]

No problemo...

I just average it over a 24 hour period... its works great but any outages tend
to
make me forget the correct reference point... then i go to work LATE   :^P

(moral of the story... powerline frequency in the USA is good enough for a
digital
clock... and thats about all :^)

H^) harry

"J. Larry Hendry" wrote:

> > All the frequencies in video are multiples of 60 Hz in US
>
> Don't use 60Hz as a reference. :)  Power line frequency is constantly
> changing as it responds to the always present unbalance between generation
> and load.  In the USA / Canada eastern interconnect, normal hour-to-hour
> fluctuations are in the range of 59.97 to 60.03.  Excursions created by
> lagging response to load changes, or sudden unexpected loss of generation
> can easily double that.  While 3/100 of a cycle does not seem like much, it
> adds up when you multiply it by 100 or 1000.
>
> Larry Hendry