Martyn Smith wrote:
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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Strictly you are correct, however some early datasheets (eg Crystek, )
say Allan variance whilst they actually tabulated its square root or
Allan deviation.
Bruce
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