[time-nuts] A counter for phase measures

Volker Esper ailer2 at t-online.de
Sat Nov 3 20:10:56 UTC 2012


Hi Bob

What is it, that limits a counters life, are you speaking of typical 
counter specific failures or do you just mean the common wearout?

Sorry, I know those are no smart questions - but my heart is thumping 
when I think of the price and the long way it has to go over the sea...

Thanks

Volker





Am 03.11.2012 17:59, schrieb Bob Camp:
> Hi
>
> Both counters have their weak points long term. On the balance I think the 620 should last longer. The 620 is the higher resolution of the two. The 620 normally comes with a bit better reference. Both are supported by various Time Nut software packages. Both do GPIB and serial i/o. The 620 is a bit more controllable over serial. The 53132 takes up less space on your bench.
>
> For the same price - go for the 620. For the usual 53132 is $1300 and the 620 is $2400, not so clear.
>
> Bob
>
>
> On Nov 3, 2012, at 10:10 AM, Volker Esper<ailer2 at t-online.de>  wrote:
>
>    
>> Thank you for the interesting information. Now, the time has come to look for an adequate counter - anyone who has experience with the HP 53132A and the SR620? If they both where at - say 1000 USD - what would you prefer for the job of phase measurement? I've read about that massive single shot capability of the SR, but - as being a newbie - is there anything I overlook at this moment?
>>
>> Thanks
>>
>> Volker - DF9PL
>>
>>
>> Am 02.11.2012 16:32, schrieb Volker Esper:
>>      
>>> Dear fellows,
>>>
>>> I'm searching for a counter that allows me to make automated measure series. Of course, Allan Deviation is an important thing to determine when experimenting with or developing GPSDOs (what I intend). So it seemed to be a nice thing to measure phase deviation with a counter (HP 53132A or SR-620 or so).
>>>
>>> When experimenting with that stuff I discovered, that all my equipment would not be adequate to determine Allan Deviations beyond 10e-11 (or so). The question is, can any counter deliver that precision / low noise to make such measurements possible? Or does it have to be a more sophisticated technique, such as cross spectrum analysis?
>>>
>>> Thanks a lot in advance
>>>
>>> Volker
>>>
>>> (I guess you recognize, that I am just a newbie to that all)
>>>
>>>
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>>
>>
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