[time-nuts] beautiful jump
SAIDJACK at aol.com
SAIDJACK at aol.com
Sat Nov 1 00:56:11 UTC 2008
Hi Tom,
the fine dac on that unit has a 40mV range with hysteresis, the coarsedac
will not have been affected. I believe the 2.7mV change on the large jump had
an effect of approx. 2ppb frequency change.
The second jump of approx. 80 microvolts had only about 6E-011 change in
frequency, that's enough to make the graph show a nice jump thanks to the GPS
reference.
We need to keep in perspective just how small some of these jumps are, but
even the small one still shows up as a 29ns deviation on the 1PPS lock..
bye,
Said
In a message dated 10/31/2008 17:31:15 Pacific Daylight Time,
tvb at LeapSecond.com writes:
Also, Said, can you tell from this unit's gpsstat if there is an
interaction between the coarse and the fine DAC?
I see in the colima.htm file the EFC went from 2.80299 to
2.80034. What the Hz/V for this unit? I.e., how many ppb
was this jump?
/tvb
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