[time-nuts] Allan Variance versus Allan Deviation

J. L. Trantham jltran at att.net
Mon Mar 28 12:28:03 UTC 2011


If Allan Deviation is the square root of Allan variance, would the 3 x
10E-11 Allan Deviation equate to an Allan Variance of 9 x 10E-22?

Joe

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Martyn Smith
Sent: Monday, March 28, 2011 6:24 AM
To: time-nuts at febo.com
Subject: [time-nuts] Allan Variance versus Allan Deviation


Hello,

I'm trying to compare the stability specifications of two oscillators.

The first spec is 2 x 10E-11 Allan Variance.
The second spec is 3 x 10E-11 Allan Deviation.

As Allan deviation (ADEV), is the square root of Allan variance, I thought 
the first spec is the better of the two, but a collegue disagrees, saying 
3x10E-11 Allan Deviation is a better spec than 2 x 10E-11 Allan Variance.

I'm sure the million experts at there will give me the correct answer

Regards

Steve Jones


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