Bob Camp wrote:
Hi
If I randomly pick up a FE 5680A data sheet, I find that it's short term
stability is 1.4/sqrt(Tau) x 10-11. Since I never doubt anything I see on a
data sheet, this immediately tells me I should get 1.4x10-12 at 100 seconds,
and I only have to wait for 10,000 seconds to get to 1.4x10-13.
Since the temperature performance is at the 1x10-12 / C level, I would need a
room that's stable to *much* better than 0.1 C over a 3 hour period to get
there. I suspect that 0.01C might not be good enough ...
So here's the question:
Has anybody run any of the cheap rubidiums (FE or Efratom) in a *very* stable
temperature environment to see how close they get / what the floor is? I've
run through a lot of data on the web, but I haven't really found what I'm
looking for.
Thanks!
Bob
Figure 7 on the FE5680 page (also on the data sheet) indicates that you
may need somewhat less than 3hours to achieve ADEV ~1E-13.
0.01C stability should be adequate.however its not necessary to control
the room temperature to this stability if the FE5680 is in an enclosure
with a sufficiently high time constant whilst having a sufficiently low
thermal resistance so as to avoid overheating the FE5680.
Bruce
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