[time-nuts] Allan Variance vs Allan Deviation

Martyn Smith martyn at ptsyst.com
Tue Mar 29 14:01:11 UTC 2011


Hello,

Sorry that I'm harping on about this subject but I want to make sure my 
brochures are correct.

I use the SR620 to measure Allan Variance.  When I look at the SR620 manual 
the formulae they give for Allan Variance is actually root Allan Variance.

So root Allan Variance is the same as Allan Deviation.

So everyone (including me), when we quote Allan Variance, we really mean 
root Allan Variance or Allan Deviation.

Does that make sense.?

Steve 




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