[time-nuts] 5061 Cs frequency shift with long time constant?
brooke at pacific.net
Tue Apr 5 11:53:18 EDT 2005
My guess is that changing a time constant may be something like
switching in a capacitor. That may cause some ringing that may last
days to weeks.
John Ackermann N8UR wrote:
> This is very odd (I seem to be collecting these sorts of problems) and
> I wonder if anyone else has seen something similar.
> I got my 5061A trimmed to the point where a 5 day run against GPS
> showed an offset of less than 1x10e-13. I then switched the unit into
> the long time constant mode and now see that the offset (over 36
> hours) is -1.7x10e-12. Nothing else in the setup has changed.
> It's hard for me to see how simply changing the loop time constant
> would change the frequency of the standard, especially by this much,
> but stranger things have happened.
> Has anyone else experienced a shift like this when switching the time
> PS -- I was able to partially, but not completely, reproduce the phase
> shift that I wrote about a couple of weeks ago by jiggling the 1 PPS
> cable to the counter. Replacing that cable seems to have resolved
> that problem.
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