I have one of my project boxes, which monitor the main freq. Here is
graph which reflect the time difference between of RTC (based on number
of pulses from OCXO) and the "MAIN TIME" which is based on number of
zero-cross events.
The observation period is 486 hours.
On 2017-12-14 23:13, Jim Harman wrote:
On Thu, Dec 14, 2017 at 10:53 PM, Bob kb8tq <kb...@n1k.org> wrote:
Of course this *assumes* an electronic approach. Given that it’s
moving
pretty slow and you
only are looking at fractions of a millisecond, one *could* do an
electro
mechanical design …...
Bob
There is interesting background on power grid frequency/time
adjustment
procedures here
https://en.wikipedia.org/wiki/Utility_frequency#Time_error_correction_(TEC)
and here
https://en.wikipedia.org/wiki/Electric_clock#Accuracy
--
WBW,
V.P.
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