Hi
The FRK's as spec'd are pretty close to the LPRO's. The FRK's when brand new
might be a lot better than spec. Based on used samples I'd guess the FRK exceed
spec by a bit more than the LPRO's.
Spec FRK (typ) LPRO (max)
FRK-L (spec)
avar 1 sec 2x10^-11 2.5x10^-11
1x10^-11
age / mo 3x10^-11 5x10^-11
1x10^-11
temp 5x10^-10 6x10^-10
1x10^-10
amb -25 to 65 -25 to 70C
-25 to 65
That's the "typical" FRK compared to the "max" LPRO. I suspect that's a
reasonable way to look at them. The FRK-L are maximums. At 100 seconds the
FRK's get town to 3 and 1x10-12. The LPRO should be doing 2.5x10^-12 at 100
seconds.
I don't think that there are very many 5065's lying awake at night with
nightmares about being less stable than a FRK or an LPRO.
Bob
On Mar 19, 2010, at 7:44 PM, Dan Rae wrote:
> Robert Atkinson wrote:
>> Changing the thread slightly, where do the Efratom FRK- L and H fit in the
>> hierarchy of Rb quality? I guess somewhere between the telco units and the
>> 5065A. Opinions welcomed!
>> Robert G8RPI.
>>
> Yes, but much closer to the Telco units than to the -hp- I'd have thought...
> dr
>
>
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