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.