[time-nuts] Best counter setting for ADEV?

Jerry jsternmd at att.net
Tue Oct 2 19:29:46 UTC 2012


Are these easily calibrated?  I contacted Wavecrest earlier today and they
want $750 for the annual calibration.  Not exactly 'hobby' friendly :-)

jerry

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Said Jackson
Sent: Tuesday, October 02, 2012 9:06 AM
To: Discussion of precise time and frequency measurement
Cc: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Best counter setting for ADEV?

There are two on ebay now, $600 and $700... Buy it now..

I would ask the seller to connect the 100MHz ref output to both inputs one
at a time and to measure jitter to make sure they work before buying
though..

Dts-2075 recommended due to higher performance.



On Oct 2, 2012, at 5:49, Azelio Boriani <azelio.boriani at screen.it> wrote:

> Wavecrest DTS for $600? Interesting...
> 
> On Tue, Oct 2, 2012 at 2:43 PM, Adrian <rfnuts at arcor.de> wrote:
> 
>> 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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