[time-nuts] Best counter setting for ADEV?

[Timeok]

Hi Adrian,
I had the Tracor and I say the instability is normal. Every decade 
multiplication is affected by noise introduced by the circuit it self. I 
think is a good, fast approach to evaluate the oscillators or adjust the 
frequency but not so affordabe for precision measurements
Luciano

Il 2012-10-02 14:43 Adrian ha scritto:
> Timeok schrieb:
>> 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
>
> Hi Luciano,
>
> interesting. So, the 53132A gains a lot more by this method than my 
> 53131A.
> As Magnus pointed to, there might be pitfalls. So, it would be
> interesting to have comparative measurements from a non questionable
> test setup.
>
> In the meantime I tried a Tracor 527A which greatly improved the
> dynamic range, but appears to suffer from serious instability that
> might or might not be normal.
>
> Adrian
>
>
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-- 
timeok