[time-nuts] Phase noise in stable 32

[slawek dabrowski]

Hello to the group,
 
Have you ever used frequency/phase data to estimate phase noise of your O's 
using Stable32? I probably do something wrong in conversions when using Power 
button because my plot starts on 10e-7 Hz and ends on 10e0 Hz
 
 



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Re: [time-nuts] Time interval measurement vs dual mixer method

[slawek dabrowski]

Hello to the group,


Thanks for interesting discussion. I found a nice plot in"Measurement, 
Instrumentation, and Sensors Handbook, Second Edition", ( John G. Webster,Halit 
Eren), at 42-24 page. It shows that in short term stability (tau 1 - 10 s) dual 
mixer method is most sensible, in long term stability TIE and DM results are 
similar. 
I'm going to do the same mesurements with Rb standard (Pendulum 6689) as DUT. 
Data is now collecting.
 
SD


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Re: [time-nuts] Time interval measurement vs dual mixer

[slawek dabrowski]

Hi,

Thanks for all answers. I'm trying to estimate the uncertainty of GPS Common 
View data  (which is based on TIE measurement) and compare it to data from dual 
mixer method.

 
Message: 6
Date: Wed, 17 Jan 2018 11:08:45 -0500
From: Bob kb8tq 
To: Luciano Paramithiotti , Discussion of precise
time and frequency measurement 
Subject: Re: [time-nuts] Time interval measurement vs dual mixer
method
Message-ID: 
Content-Type: text/plain; charset=utf-8

Hi

If the time offset gets to the point that it bothers the measurement, you 
likely are
running to low a difference frequency.  It is quite possible (though not easy) 
to get
low parts in 10^-13 running an offset of 8 or 9 Hz at 10 MHz.

If you are running very precise signals, then line stretchers can be used to get
everything so it hits at the same point. There are NBS papers where they talk
about doing exactly this sort of thing. Results were ‶within a couple of 
microseconds
as I recall.

Bob

> On Jan 17, 2018, at 1:44 AM, tim...@timeok.it wrote:
> 
> 
>   Hi Slawek,
>   I have tried two versions of DMTD and I think the biggest problem with this 
> method is the fact that two measures made on the same DUT  never coincide.
>   The DMTD suffers from time  wrap and the measurement results are linked to 
> the time difference presetted by  t1 and t2.
>   At the moment I am using the TICC with good results, attached to the noise 
> floor.
>   I think that in order to have a better resolution we need to focus on a 
> recent production
>   error multiplier such as the A7 of Quartzlock or a similar one to  be 
> self-constructing.
>   http://quartzlock.com/userfiles/downloads/manuals/A7-A_&_A7-MX_Manual.pdf
>   Luciano
>   www.timeok.it
> 
> 
>   Da "time-nuts" time-nuts-boun...@febo.com
>   A "time-nuts" time-nuts@febo.com
>   Cc
>   Data Tue, 16 Jan 2018 17:58:18 +0100
>   Oggetto [time-nuts] Time interval measurement vs dual mixer method
> 
>   Hello to the group!
> 
>   Have you ever measured frequency standard (or other precision oscillator) 
> simultanously by time interval method (difference between 1 pps ref and 1 pps 
> DUT) and dual mixer method (e.q. with phase/frequency comparator)? I'm very 
> interested in results.
> 
>   Slawek
>




 



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Re: [time-nuts] Time interval measurement vs dual mixer

[slawek dabrowski]

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[time-nuts] Time interval measurement vs dual mixer method

[slawek dabrowski]

Hello to the group!

Have you ever measured frequency standard (or other precision oscillator) 
simultanously by time interval method (difference between 1 pps ref and 1 pps 
DUT) and dual mixer method (e.q. with phase/frequency comparator)? I'm very 
interested in results.

Slawek


 



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[time-nuts] MAINTENANCE OF HP 5071A PRIMARY FREQUENCY STANDARDS USNO

[slawek dabrowski]

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