[time-nuts] getting a grip on 10811 drift (trying to read my instruments)

Charles P. Steinmetz charles_steinmetz at lavabit.com
Fri Nov 16 07:30:48 UTC 2012


Chris wrote:

>According to the documentation I have, pins 2, 4, and 5 are all tied
>together internally

I think you may be correct.  My recollection was that it needed to be 
done at the connector, but I may be mis-remembering.  Worth a check, though.

If you have Pin 6 ranging from + 5 V to - 5 V with respect to Pin 2 
and are only getting 50 mHz of frequency change, then yes, it appears 
that the EFC in that oscillator is not working normally.

Note that different versions of the 10811 have different nominal EFC 
slopes -- most are nominally 0.1 Hz/V (1 Hz/10 V), but some are 
nominally 0.25 Hz/V (2.5 Hz/10 V) (05071-60219, 05071-69219, 
10811-60158, 10811-60159, 10811-60160, 10811-60164).  The 10811 D/E 
Option 100 and Option H41 (10811-60125, 10811-60131, 10811E Option 
H41, 10811-60133, and 10811-69133) are "Not Specified" for EFC.  I do 
not know if this means they do not have EFC, or only that they are 
not guaranteed to meet any particular EFC slope.  I think the latter 
is more likely -- perhaps Rick knows and will comment, or someone 
here has an Option 100 or Option H41 oscillator and can measure it.

Best regards,

Charles











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