On 02/05/13 16:36, Ian Jackson wrote:

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.
AFAIK the daily average is always exactly 50hz.

HOWEVER a friend of mine on encountering the gridwatch site said 'you
don't happen to have a record of frequency over the last two years do
you' I said 'yes I do' 'what is the max and min and average deviation
frequencies you have seen' I told him.

"**** now I know why that instrrument that used mains frequency to do
timing was always drifting about..I TOLD them it need a crystal clock
added to it, but I couldn't PROVE it..."



--
Ineptocracy

(in-ep-toc-ra-cy) €“ a system of government where the least capable to lead are elected by the least capable of producing, and where the members of society least likely to sustain themselves or succeed, are rewarded with goods and services paid for by the confiscated wealth of a diminishing number of producers.