[time-nuts] Datum FTS 4065B Plot

Brooke Clarke brooke at pacific.net
Wed May 14 11:40:34 EDT 2008


I've been looking at the 4065B Cesium standard vs. GPS this month.  After the 
plot showed a slope of 472E-15 the frequency offset was changed from zero to 
472 on 8 May (gambling on the sign).  For the next couple of days the points 
all were in a box 20 ns high.  BUT then the slope changed.  It's now got a 
positive slope that's very close to 472E-15 and the frequency offset is at 472 
not zero.  See attached plot.

What might be causing this?  For example the 4065B is just sitting on a chest 
of drawers and might be moved or rotated a little from time to time.  Is there 
a requirement that it be in a temperature controlled room on a concrete pillar 
to get into the E-14 area?

It just turns on better than 5E-13 and the attached plot seems to indicate that 
it and be manually adjusted to parts in E-14 but so far I've not been able to 
do that.

Have Fun,

Brooke Clarke
http://www.prc68.com/P/Prod.html  Products I make and sell
http://www.prc68.com/Alpha.shtml  All my web pages listed based on html name
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Web Cam
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