On Wed, 5 Oct 2016 11:01:36 -0700
"Tom Van Baak" <t...@leapsecond.com> wrote:

> Nice set of questions. The short answer is that for a GPSDO,
> - The left side of the ADEV plot will show the difference between the quality 
> of the local oscillator, in your case TCXO vs. OCXO vs. Rb. 
> - The middle of the ADEV plot will show the difference in the choice of 
> time-constant or the environmental conditions during the test.
> - The right side of the ADEV will show the quality of the GPS timing receiver.
> 
> Also,
> - The left side of the ADEV plot may expose limitations in your measurement 
> equipment or the local low-noise reference that you're using.
> - The right side of the ADEV plot may expose limitations in your local 
> frequency reference. A cesium or H-maser helps here. If you use one GPSDO to 
> test another GPSDO the very right side of the ADEV plot is misleading.

Additional to this, I recommend having a look at Enrico's Chart[1].
It lables all the slopes in the different forms we measure stability
and what noise type they represent, and also their relationship.

                        Attila Kinali


[1] http://rubiola.org/pdf-static/Enrico's-chart-EFTS.pdf


-- 
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
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.

Reply via email to