Re: [time-nuts] HP 5065A flaws and improvements

[Poul-Henning Kamp]

In message , Bob Camp writes:

>> 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.

I'm pretty sure that is easily fixable, it's Zener in the power-supply
which has become temperature sensitive.

-- 
Poul-Henning Kamp   | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
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Never attribute to malice what can adequately be explained by incompetence.
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Re: [time-nuts] HP 5065A flaws and improvements

[Poul-Henning Kamp]

In message 

Re: [time-nuts] HP 5065A flaws and improvements

[Bob Camp]

Hi

> On Mar 12, 2016, at 4:56 PM, Stewart Cobb  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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[time-nuts] HP 5065A flaws and improvements

[Stewart Cobb]

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 "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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