John Miles said the following on 07/01/2012 05:18 PM:
The real problem with the 5065A is that it represents the end of the line
for most noncommercial users. There are no further upgrade possibilities
for taus out to several hours -- not even the best commercial cesium
standards -- until you get into masers.
This is a really good (and frustrating!) point. The 5065A is not
stellar at taus less than a few seconds -- mine doesn't quite hit
1x10e-12 at 1 second -- but from that point out to at least 10K seconds,
it's extraordinary.
Here's a plot I did recently of the short-term stability of some
atomics, versus a BVA which is below 3x10e-13 from 0.1 out to 10K
seconds. You can infer how good the 5065A is at medium tau from the
fact that it's still on the way down when the BVA aging starts to show
at around 600 seconds:
http://www.febo.com/pages/oscillators/atomics/
I'm still planning to do a (long) comparison of the 5065A vs. my best Cs
or a GPSDO to see if I can find its floor.
John
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