On 2/12/21 3:12 AM, Andy Talbot wrote:
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?
I would think they try to hold it over 1 day, so that mains driven
clocks don't run slow or fast. That being said, I wonder how many
clocks are still being built using a synchronous motor drive? Given that
all the clocks on appliances in my kitchen have drifted apart, I'll bet
they use their internal microcontroller crystal as a reference.
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