[time-nuts] Heathkit clock available

Tom Van Baak tvb at LeapSecond.com
Fri Aug 12 14:03:51 EDT 2016

> before you buy AC line disciplined clock read that


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.



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