[time-nuts] HP 5065A flaws and improvements

[Bob Camp]

Hi

> On Mar 12, 2016, at 4:56 PM, Stewart Cobb <stewart.cobb at gmail.com> wrote:
> 
> Bob Camp wrote:
> 
>> The 5065 has great ADEV numbers.
>> In “as delivered” condition it has horrid
>> TC and pressure sensitivity.
> 
> That's the first I've heard of any drawbacks to the 5065.  Can you give
> more details on this?

The manual talks about a 5x10^-11 temperature stability over 0-50C. Various members have reported data that suggests a stability about 10X worse than this. The manual spec is worse than what you see on most telecom Rb’s over that narrow a range. The actual performance compared to a telecom Rb in the same environment appears to be worse. 

Pressure sensitivity is not listed. All Rb’s are sensitive to pressure to some degree. Lab data from various experiments often shows up with a note “pressure change” to explain a bump in the data. 

Bob


> 
> The "as delivered" implies that there may be improvements available? Any
> details on improvements?
> 
> I'm aware of Corby's optical filter trick, which improves SNR and hence
> ADEV, but that would not affect sensitivity to temperature or pressure.
> 
> Cheers!
> --Stu
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