[time-nuts] How to measure Allan Deviation?

[Didier Juges]

It just so happen that I also have an HP 5334B, which I bought when I 
had given up on getting an HP5370 for a *reasonable* cost, considering 
my application. It draws 20 VA instead of 200, but this one does not 
have the 10811 time base. This will also be a lot easier on the UPS, as 
we do loose power here somewhat regularly (but not for long, unless a 
hurricane is involved) during the stormy season.

Thanks for another great suggestion.

Didier

John Ackermann N8UR wrote:
> Dr Bruce Griffiths said the following on 10/22/2006 07:19 PM:
>
>   
>> An inexpensive modern time interval counter with a power dissipation of 
>> less than 10 watts and a resolution comparable to the 5370 would be 
>> useful for such comparisons especially if the experiment lasts several 
>> months.
>>     
>
> I don't usually use the 5370 for long-term measurements, as it does make
> a very noticeable amount of heat.  Since the long term averages don't
> really need super resolution, I find that an HP 5334 counter, which has
> 2ns resolution and dissipates far less heat, works well.
>
> My current experiment is using a 5334 along with a GPIB-controlled coax
> switch (forget the HP number right now) to do 100 second averages of six
> combinations (CS1-GPS, CS2-GPS, RB1-GPS, CS2-CS1, RB1-CS1, and RB1-CS2)
> so I end up with a tau of 600 seconds and ~200ps resolution with the 100
> sample average.
>
> John
>
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