[time-nuts] Best counter setting for ADEV?

Timeok timeok at timeok.it
Tue Oct 2 09:06:31 EDT 2012


Hi Said,
I have bought the HP53132A from HP several years ago when WWW and ebay 
was not invented! hi!
I agree with you about the wavecrest
luciano

Il 2012-10-02 14:40 Said Jackson ha scritto:
> Luciano,
>
> For TI mode, I have recommended the Wavecrest DTS time interval
> counters here in the past.
>
> Can be 1/2 price of an HP 53132A ($600 or so) on ebay, has 800
> femtoseconds resolution, and around 3ps SD typically. Goes to 800Mhz
> or twice that depending on model. That blows the 53132A out of the
> water.
>
> Useless in frequency mode though, one must calculate frequency by
> fast time interval measurement on the 10MHz for example using Stable
> 32 etc.
>
> Heavy, large, and power hungry, but quite solid.
>
> Said
>
>
>
> On Oct 2, 2012, at 4:29, Timeok <timeok at timeok.it> wrote:
>
>> test using HP53123A:
>> The pink line is the noise floor using the TI mode
>> The blue line is the noise floor using the Frequency mode (gate 2 
>> sec)
>> The other two line are the same oscillator, an HP105B tested with 
>> both the modes.
>> As you can see the range between 1 and 200 sec is "totally
>> compromised" by the system noise floor using the TI method.
>> The approximation using the freq mode can be anyway usefull to make 
>> a
>> comparatinon between two source.
>> I suppose to have right measurements, without any restriction we 
>> have
>> to use the Timepod or other high level instruments than this kind of
>> counters.
>>
>> Luciano
>> <TIvs Freq mode1.jpg>
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-- 
timeok




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