[time-nuts] PRS-10 findings
SAIDJACK at aol.com
SAIDJACK at aol.com
Wed May 30 03:10:12 EDT 2007
Hello guys,
some time ago we talked about curious humps in the ADEV of the SRS PRS-10 Rb
at around 20s intervalls.
I think I may have more info on that (and as usually that raises more
questions):
Below is a capture of the phase offset between a PRS10 1PPS output compared
to the Jackson-Labs Fury 1PPS output as measured with a 53132A.
The Fury output has been shifted by about 80ns to give a nice phase offset
for the 53132A to measure.
Besides the underlying counter noise, there clearly is a jump of about 0.5 -
1ns visible exactly once every 15 seconds! Indicated by arrows.
Could this be the counter self-calibrating? This is too regular to be
co-incident.
Has anyone else seen this?
I don't see this on a scope when comparing two 1PPS's so I do think it's the
counter.
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