[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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