[time-nuts] Raw phase data of super-5065
timeok at timeok.it
timeok at timeok.it
Fri Jun 8 10:07:01 EDT 2018
Hi,
This test requires that the two Rubidiun be installed in the same cabinet so they are subject to the same temperature and atmospheric pressure.
Acquisitions were made simultaneously.To confirm the data collected, the same test was repeated in another site with two different HP5065, one modified in B or "supe" and the other unmodified.
The results were very similar, that is, both the Super version has a worse lmedium term Adev than the unmodified version.
All this suggests that the modification with the addition of the 780nm filter worsens the medium term stability of the HP5065.
Therefore I would tend to exclude that the results obtained depend on the different sensitiveness towards atmospheric pressure or to the variations of the environmental temperature.
It would be interesting that for further confirmation of what I have deduced other people could carry out the same tests in the medium and long term Adev stability.
Luciano
www.timeok.it
Da "Bob kb8tq" kb8tq at n1k.org
A "Luciano Paramithiotti" timeok at timeok.it,"Discussion of precise time and frequency measurement" time-nuts at febo.com
Cc
Data Fri, 8 Jun 2018 09:02:34 -0400
Oggetto Re: [time-nuts] Raw phase data of super-5065
Hi
Ok, so this question should not come as a great surprise: Does one of the 5065’s have about 3X the temperature
sensitivity of the other? ( or pressure or humidity ).
Bob
> On Jun 8, 2018, at 8:05 AM, timeok at timeok.it wrote:
>
>
> Here a ten days simultaneously run of the A and B version compared with my HP Z3816A GPSDO.
> Luciano
>
>
> Da "time-nuts" time-nuts-bounces at febo.com
> A kb8tq at n1k.org
> Cc "time-nuts" time-nuts at febo.com
> Data Wed, 6 Jun 2018 08:18:27 +0200
> Oggetto Re: [time-nuts] Raw phase data of super-5065
>
> Hi,
>
> certainly the environmental effects are significant and it is precisely for this reason that
> acquisitions have been made simultaneously on two 5065, one modified and the other not.
> To verify the results the same measures were taken with another pair of 5065, one modified and the other not.
> This second test was carried out at another site 300Km from the first one.
> Both tests showed a better and more consistent medium/long term ADEV than the unmodified HP5065A.
> I want to clarify that these measures have the objective of verifying the medium / long term stability and not the short term stability of the Super version I agree it is improved..
> Luciano
>
>
> Da "Bob kb8tq" kb8tq at n1k.org
> A "Luciano Paramithiotti" timeok at timeok.it,"Discussion of precise time and frequency measurement" time-nuts at febo.com
> Cc
> Data Tue, 5 Jun 2018 10:05:34 -0400
> Oggetto Re: [time-nuts] Raw phase data of super-5065
> Hi
>
> It is pretty well known that without “help” ( beyond the filter stuff on the super) the 5065 has fairly poor temperature
> stability and somewhat variable response to pressure and humidity. Taking two samples right off the production line
> likely would have given you different long term data as a result.
>
> If you are going to the trouble of watching these devices for a long time, monitor temperature, pressure and humidity.
> I suspect you will find correlations ….
>
> Bob
>
>> On Jun 5, 2018, at 5:44 AM, timeok at timeok.it wrote:
>>
>>
>> Hi Attila,
>> I am doing the long therm stability test on a couple of HP5065, one original A type, the second B or "super" compared with my best long therm stability, a GPSDO HPz3816A.
>> This test will be 30 days long. It is a second test, with a second couple of HP5065A/B, to verify the long therm stability of both the version.
>>
>> Up to now the data available for version B or "super" only concerned the improvement of phase noise.
>>
>> From the first results it seems that the HP5065A is more stable within 30days than the modified version with the filter.
>> It must be considered that the short-term stability of 5065 is better than the GPSDO / TICC up to 10-80k sec then, in this test configuration the valid data will be beyond these values.
>> The results will be ready within 28 days and I will be happy to share them in order to have everyone's opinion.
>> Regards,
>> Luciano
>>
>>
>> Da "time-nuts" time-nuts-bounces at febo.com
>> A "Discussion of precise time and frequency measurement" time-nuts at febo.com
>> Cc
>> Data Mon, 4 Jun 2018 10:11:50 +0200
>> Oggetto [time-nuts] Raw phase data of super-5065
>> Hoi zäme!
>>
>> Would one (preferably multiple) of the owners of a super-5065 be so kind
>> and share the raw phase data of an super-5065 against a stable reference
>> with me? The longer the data trace, the better.
>>
>> Thanks in advance!
>>
>> Attila Kinali
>>
>> --
>> It is upon moral qualities that a society is ultimately founded. All
>> the prosperity and technological sophistication in the world is of no
>> use without that foundation.
>> -- Miss Matheson, The Diamond Age, Neil Stephenson
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