[time-nuts] Measuring ADEV using TBolt-Tic tester

ws at Yahoo warrensjmail-one at yahoo.com
Thu Oct 13 12:25:16 EDT 2011


Using the 1 sec ADEV value of  wich is limited by the one shot resolution

>>> http://www.febo.com/pipermail/time-nuts/attachments/20111007/48d1ab68/attachment-0001.gif

The one shot resolution of the Tbolt's Phase detector is
The one shot resolutioon of the Tbolt's Freq offset data is \

>>>


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[time-nuts] Measuring ADEV using TBolt-Tic tester
Azelio Boriani azelio.boriani at screen.it
Thu Oct 13 10:21:40 UTC 2011
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The HP58503A has the Oncore 8-channel GPS receiver. The single-shot
resolution capability is the ability to resolve the time interval
without any averaging. For example, the Fluke/Pendulum PM6681/CNT81
has a 50pS resolution, the HP5370 has 20pS, the Racal Instruments 2351
VXI TIC has 8pS single shot maximum resolution, the Wavecrest SIA3000
signal analyzer has 200femtoS hardware resolution at 3GHz.

On 10/13/11, ws at Yahoo <warrensjmail-one at yahoo.com> wrote:
> I know very little about the HP58503A. Any chance it is using the old 6
> channel Oncore GPS engine?
> If it is like the Oncore I tested long ago, that noise was about a decade 
> or
> so higher than the Tbolt's phase noise.
>
> Not sure what you can call single-shot resolution. The data is reported 
> with
> Pico second  resolution.
> The cycle to cycle max phase varation, If there is not a satellite change 
> at
> the same time, is around  0.4ns  max error.
> With the very high resolution that is output, averaging  provides a lot of
> benefit.
> The noise of the Tbolt's freq (PPT) output data measured about ten times
> lower than it's phase output data at 1 sec.
> How it does it is anyone guess, but looks to be some sort of high speed
> averaging going on, taken over a one second time interval.
>
> ws
>
> *****************
> ----- Original Message -----
> From: "Azelio Boriani" <azelio.boriani at screen.it
>
>
>> Your work is very interesting, now I wonder what is the Tbolt
>> single-shot resolution? Does the Tbolt use the analog interpolator
>> method? I don't have the Tbolt, I have an HP58503A at work as the only
>> reference.
>>
> ********************** 





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