[time-nuts] Quick Allan deviation measures

Brooke Clarke brooke at pacific.net
Mon Jul 24 16:30:16 EDT 2006


Hi Tom:

Do you have a plot that goes past 1 day?  What happens at 2 days, a 
week, etc?

Have Fun,

Brooke

Tom Van Baak wrote:

>>See how the GPS diciplined 10811 with extra oven keeps it track above that
>>    
>>
>of
>  
>
>>a normal 10811 sitting in a unit. Notice also that the Cx1 had been
>>    
>>
>powered
>  
>
>>only for an hour instead of over 24 hours.
>>    
>>
>
>Since you're only looking at tau of 0.001 to 1 second
>things like warm-up time and ovens have little or no
>effect.
>
>  
>
>>Infact, the GPS is worst of all these sources!!!
>>
>>I am quite sure that a 10 s measure would should the GPS even more
>>infavourable.
>>    
>>
>
>Correct (as it should) and even worse at 100 s and maybe
>even 1000 s. But beyond an hour of averaging time your
>Z3801A will start to shine. See typical Z3801A ADEV plot:
>
>http://www.leapsecond.com/museum/z3801a/log8286v.gif
>
>/tvb
>
>
>
>
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>  
>

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