[time-nuts] Best counter setting for ADEV?

Azelio Boriani azelio.boriani at screen.it
Tue Oct 2 12:30:21 UTC 2012


Hmm, the frequency mode sigma is the same as the TI mode sigma for 200*tau.
That is if I take the sigma at 200*tau from the TI mode I have the same
figure of the frequency mode. Maybe the frequency mode 2 seconds sample
time uses 100 averages per second.

On Tue, Oct 2, 2012 at 1:50 PM, Timeok <timeok at timeok.it> wrote:

> correction: HP53132A
>
>
> timeok
>
> Il 2012-10-02 13:29 Timeok ha scritto:
>
>  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
>>
>
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