[time-nuts] Best counter setting for ADEV?

Adrian rfnuts at arcor.de
Tue Oct 2 08:51:24 EDT 2012


No matter how much averaging takes place inside the counter, in TI mode 
the output resolution is limited to +/- 200ps (53132A) or +/- 500ps 
(53131A) which appears to translate directly into the measurement limit 
/ noise floor.

Adrian

Azelio Boriani schrieb:
> 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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