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

Tim Shoppa tshoppa at gmail.com
Fri May 30 18:03:41 UTC 2014

What did NIST do with its Rubidium ensemble before they got the cesium fountain?

Did they break one of the rubidiums off the ensemble, maybe in a
different room with different HVAC, and look at the one vs many?

Would that be useful for OCXO's, measuring one OCXO against an ensemble?

Tim N3QE

On 5/30/14, cdelect at juno.com <cdelect at juno.com> wrote:
> 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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