Hi Cute !!
It certainly beats firing up an R-392 to see if you can get a tick from WWV… Bob > On Mar 11, 2018, at 5:42 PM, Tom Van Baak <t...@leapsecond.com> wrote: > >> “Back in the day” we used WWV and the kitchen clock for that sort of thing…… > > Bob, > > Yes, not much has changed. I use multiple methods to measure 60 Hz in order > to gain confidence in the results. Besides the picPET, I've used a commercial > TrueTime TFDM (Time/Frequency Deviation Meter) and also a plain old kitchen > clock (synchronous motor, wall clock). > > Example: I took photos of the kitchen clock precisely 30 seconds after each > quarter hour. Here's the short animated GIF of that run; you can see how the > wall clock wanders from 0 to 5 seconds ahead of the UTC reference clock (seen > in the background): > > http://leapsecond.com/pages/tec/mains-clock-ani.gif > > For alert readers: the +/- 1 second jitter in the reference clock is due to > drift and latency in the PC scripts used to trigger the photo capture. Also > sunrise (Pacific time) can be seen in the background starting about 1300 UTC. > > /tvb > > _______________________________________________ > 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. _______________________________________________ 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.
