Hi Andy I recall many years ago when most of us had mains synchronous motor
clocks the frequency was tweaked nationally to set the clocks right at I
think 06:00 every morning. I guess since most now use quartz clocks that has
been dropped.........interesting! Just turn the wind down a bit will you
:-))
Alan
G3NYK
----- Original Message -----
From: "Andy Talbot" <[email protected]>
To: <[email protected]>; "Discussion of precise time and frequency
measurement" <[email protected]>
Sent: Friday, February 12, 2021 11:12 AM
Subject: [time-nuts] Mains Frequency
I maintain a real time display of mains frequency, and the cumulative
timing offset from real time. It was last reset 10 days ago when we had
a
brief power outage (HV fault a mile or so away).
Since then, for the first few days the timing discrepancy kept within
plus/minus perhaps 20 seconds. But in the last couple of days is has
crept
up and is now sitting at +48 seconds. On average the frequency will have
been running about 0.013Hz high to give that.
Given Nat. Grid still aim to average out to exactly 50Hz, does anyone know
if there is a time scale associated with that long-term average?
Andy
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