Hi John:
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.
Have Fun,
Brooke
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 constant?
Thanks,
John
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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