Maarten Wiltink wrote: > "Patrick Nolan" <[EMAIL PROTECTED]> wrote in message > news:[EMAIL PROTECTED] > > >>[...] I'm amazed that clock radios, plugged into the 60 Hz supply, >>aren't as good [as wrist watches]. > > > So am I. Because here at least, they keep a close eye on the number > of zero crossings in the power plants, and make very sure that it > comes out right at the end of the day.
I think that power companies almost everywhere count the cycles in the day. Since most are interconnected, staying in phase is mandatory! So there are 60*86400 or 50*86400 cycles per day but the difference between any two consecutive crossings is not guaranteed to be exactly 1/100 or 1/120 of a second. The generators slow down when the load increases or speed up when the load decreases! _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
