[time-nuts] Cesium DOES Drift, not

Chuck Harris cfharris at erols.com
Wed Apr 20 23:27:09 UTC 2005


Hi Brooke,

There should be some evidence that the center of the beam
current is slipping off of its peak value if it is a control
loop failure.

Perhaps you can open the loop, and use the control voltage pot
to peak the beam current and check the frequency at that point?

-Chuck

Brooke Clarke wrote:
> Hi Chuck:
> 
> Is there something I can to do check for control loop failure?
> 
> Brooke
> 
> Chuck Harris wrote:
> 
>> Bill Hawkins wrote:
>>
>>> How about this:
>>>
>>> Brooke is watching the last of his cesium evaporate.
>>>
>>> Bill Hawkins
>>
>>
>>
>> I don't think so, that appears as greater and greater phase noise.
>>
>> I think Brooke is watching his control loop fail.  Cs doesn't drift,
>> that is why it is a primary standard.
>>




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