[time-nuts] Caveats on Allan Deviation with ultra stable oscillators

cdelect at juno.com cdelect at juno.com
Fri May 30 13:26:30 EDT 2014


Hi,

I usually don't use drift removal as I want to see the effects of drift!

The effects of oscillators locking together are very apparent on both the
phase and AD plots when using a DMTD system. There was no indications of
such locking!

My point was that if you are measuring ultrastable Quartz oscillators
against each other the AD at the higher Tau will not reflect the true
stability of the oscillators.

Only a Maser or high performance Rubidium (HP5065A) will reveal the true
behavior.

Cheers,

Corby




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