[time-nuts] 5061 Cs frequency shift with long time constant?
John Ackermann N8UR
jra at febo.com
Tue Apr 5 12:53:35 EDT 2005
Poul-Henning Kamp wrote:
> In message <4252B46E.3010509 at pacific.net>, Brooke Clarke writes:
>>>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.
> Yes, very likely. The leak-current in the integrating capacitor cannot
> be fully ignored at this level.
Excellent point, Poul-Henning. That could explain it. (I need to look
at the schematic tonight to see what the values are.)
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