[time-nuts] Best counter setting for ADEV?

[SAIDJACK at aol.com]

Yes, very easy:
 
1) calibrate the internal 100MHz vectron OCXO using a small screwdriver,  
this is not really critical though as the unit does not really function as a  
frequency counter.
 
2) Calibrate the power supplies for proper voltages if necessary with same  
screwdriver, I found that is really not necessary usually
 
3) Auto-calibrate all the timing circuits using the built-in  calibration 
feature and two external SMA cables, and two SMA shorts. The button  to do 
that is on the front panel, and the unit does not have to be opened for  this.
 
You can also use their VISI application to do some more intensive  
long-term-averaging calibrations that are started via GPIB commands.
 
There are user/service manuals floating around the web.
 
Item 3) above is really the only thing that needs to be done from time to  
time I think.
 
bye,
Said
 
 
In a message dated 10/2/2012 12:30:34 Pacific Daylight Time,  
jsternmd at att.net writes:

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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