Alex (et al), There is also the FNET project here: http://fnetpublic.utk.edu/
They have monitoring boxes that various people set up to monitor line frequency, disciplined to GPS, and upload to their servers. I have one of these boxes in my office (Unit #1033 here: http://fnetpublic.utk.edu/tabledisplay.html). All and all, the US power grid is pretty close to 60Hz. =) It is fun to watch how each of the interconnects here in the US lead/lag 60Hz depending on the time of day, and the load on the system (at least, I assume that’s the cause). Thanks! -Ryan Stasel > On Aug 12, 2016, at 11:03 , Tom Van Baak <[email protected]> wrote: > >> before you buy AC line disciplined clock read that > > Alex, > > That old article from 2011 is misleading. It correctly describes what was > being /proposed/, but it turns out NERC chose not to implement what the > article (fears) talks about. There are lots of time-nuts postings about this > in the 2011 archives if you want to read more. Or google for TEC (time error > correction). > > So your 60 Hz timekeeping is probably fine and still loosely locked to UTC. > Several of us time nuts continuously monitor mains frequency & phase for fun. > It's an interesting and low-cost entry into the world of time & frequency > measurement, long-term data logging, data analysis, Allan deviation, etc. > > Here's a quick plot showing the last 2 months (US western grid). Someone else > (Hal?) can double check it. > > http://leapsecond.com/pages/mains/mains-june-july-2016.gif > > /tvb > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
