[time-nuts] Low-Cost Rubidium Performance

[WarrenS]

Indeed,
ADEV is for random freq variation not easily measured by other means.
Temperature fluctuations do not cause random freq changes and the 
temperature's effect should be removed if one wants accurate long term ADEV 
numbers.
Even daily diurnal cycles due to temperature can have major negative effect 
on ADEV numbers as low as 2000 to 3000 seconds,
and if there is an Heater or AC cycling, then any ADEV numbers about a few 
hundred seconds can be due to TempCoeff, which should not be measured with 
ADEV or included in ADEV plots.
This is much the same as a single outlier data point that can screw up the 
whole ADEV plot and make it pretty much meaningless and unrepeatable.
Ditto for linear ageing, Should be remove first if one wants true ADEV 
plots.

ws

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[time-nuts] Low-Cost Rubidium Performance
Bob Camp lists at rtty.us
Thu Feb 9 11:58:27 UTC 2012

Hi

Past 100 seconds I have seen some FE's that look better than your LPRO plot 
and some FE's that look worse than your FE plots. Running in a +/- 2C room 
apparently is not the best way to operate them for good long tau 
performance.

Bob