We are more a group of experimenters than lamenters, so here's an open invitation to all of you in the US to join me on a 60 Hz measurement party, starting as soon as you can and lasting as many weeks or months that it takes to get interesting plots.
There's no agenda; we measure because we can. Anything about precise time is fun. There hasn't been a leap second to watch for a while so this is the next best thing. The last time I carefully measured 60 Hz was in 2004. See: http://www.leapsecond.com/pages/mains/ To overcome some questions about that data set, last year I collected 60 Hz data using a GPSDO PIC that time-stamped each zero crossing (yes, it's excessive but since when has that stopped me). I'll restart that now and let it run all summer. Anyway, you're welcome to use any 60 Hz monitoring method that you can think of, whether seriously technical or just plain humorous; clever or Rube Goldberg. Actually, the greater the variety of methods used the more fun the group project will be. It could be as simple as noting AC wall clock time once a day and making a summer plot on the back of an envelope. Or as weird as integrating the hum of a sound card on a PC running NTP making MRTG plots. Let your imagination flow. Please consider contributing to the effort. It seems the last time anything interesting happened with mains frequency was when Los Angeles changed from 50 Hz to 60 Hz in 1936. Thanks, /tvb http://www.LeapSecond.com/time-nuts.htm _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.