Ian W. Wright wrote: > > Yes, you're right but I'm not sure how close they ahere to > that nowadays. With the common frequency dips due to load > problems and the tendency for people to convert to quartz > timing instead of mains synchronous, I wonder if they bother > so much or whether they just try to get it right weekly or > some such. Maybe I'll put a mains frequency monitor on here > out of interest - its 13 years since I retired from the > ratrace of chasing power around plant rooms...... > > We have several line-synched electronic clocks here, and they all keep excellent time. So, it seems the utility here (and thus, the entire midwest-US electric grid) maintains very good long-term synch. In fact, these line-sync clocks are more accurate than the clocks in some of my computers that do not have NTP running to correct their drift.
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