On Thursday, May 2, 2013 4:36:41 PM UTC+1, Ian Jackson wrote:
In message ,

whisky-dave writes

On Thursday, May 2, 2013 3:51:25 PM UTC+1, harry wrote:













It's ******** because as the frequency is the same everywhere in the



UK, what's the point of measuring it?



The ******** is on here too about how to measure it.



My grid link PV inverter measures the frequency, so any time you want



to know I can tell you.



It's usually less than 50Hz BTW.



http://www.gridwatch.templar.co.uk/



15:55 50.056Hz so what is it at your end.



checking my office with a maplin plugin thingy (probabley not that

acurate but :-

212V 51Hz, with the occasional 211V and 51Hz



Is it still not true that synchronous clocks are kept accurate by

ensuring that the correct number of cycles* (in the preceding 24 hours)

have been delivered by 8am every morning?

*My calculator tells me that the mains frequency should be 4,320,000

cycles per day.

Only if your day is 24 hours, when it's actually 23 hours, 56 minutes and 4.090 seconds so about 4,308,453.5 cycles.





--

Ian