In message <[EMAIL PROTECTED]>, 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.)
John
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