This clock
http://www.sgitheach.org.uk/atomic.html
has two timekeepers - one from the Rb oscillator and one from mains
frequency. I set the clocks using a GPS receiver. I can display the
time difference between the two clocks and idly watch the difference
wobble backwards a forwards. The greatest difference I have seen is
about 2 seconds. As commented earlier, frequency (in the UK Mainland)
dips during the day and then runs higher overnight to compensate,
usually but not always.
cheers Grahame
Highlands Scotland
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