Bob,
The long tube Cs standard (NIST 7) is parked in the entrance. Too noisy
to contribute much value. They have a bunch of 5071As and hydrogen
masers. They live in individually temperature stabilized compartments.
One typically is selected as the reference and then you measures
differences. With these differences they then run the ensemble program
on a pair of redundant PCs every 12 min.
Cheers,
Magnus
On 05/30/2014 09:24 PM, Bob Camp wrote:
Hi
Rubidium ensemble? That would have been quite a while back. They have been
running on long tube Cs standards for quite a while.
Bob
On May 30, 2014, at 2:03 PM, Tim Shoppa <[email protected]> wrote:
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, [email protected] <[email protected]> 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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