[time-nuts] Thunderbolt behaviour with long time constants.

[Mark Spencer]

First apologies for the zipped attachement.
 
I thought some members of the mailing list might find the attached plot of the 
performance of my Thunderbolt to be interesting.    After looking at the 
performance of my Thunderbolt with a time constant of 225 seconds which seems to 

be about right for my Thunderbolt, I noticed that the Allan deviation appeared 
to be be reduced at high values of Tau (approx 2,000 seconds..)
 
I then changed the time constant of my Thunderbolt to 2,000 seconds and compared 

the two plots.   I'm quite surprised at the result and the similarity between 
the peformance at low values of tau with the two different time constants.
I took 4 readings per second with a 5370B, hence each unit of tau on the graph 
is approx .25 of a second.   

I'll likley try other time constants in the future

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