[time-nuts] How to measure Allan Deviation?

[Dr Bruce Griffiths]

Didier Juges wrote:
> Hi Ulrich,
>
> comments are embedded:
>
> Ulrich Bangert wrote:
>   
>> the Datum LPRO User's Guide / Installation Guide discusses some methods
>> of sine to square wave conversion in terms of lowest phase noise. 
>>
>>   
>>     
> This is good to know. Do you have any suggestion how I might get a copy 
> of the relevant pages of the manual?
>   
>> Since you were originally asking for Allan Deviation i would like to
>> advertise again my free PLOTTER software which does what ALAVAR does but
>> more nicely + many things more. Since it does not simply open the input
>> file but first makes a copy to a "working file" you may even work with
>> it on files in that a different program is currently sampling data, so
>> you don't have to wait to the end of data acquistion but may get
>> intermediate results at any time.
>>
>>   
>>     
> That sounds like a great feature, nothing worse than stopping a long 
> test period just to see if the data is any good, even though I should 
> get the same result by copying the log in progress in a temp file using 
> conventional methods. Your program saves the step and makes it that much 
> more convenient. I will download it. I will make sure my program does 
> not buffer too much data before flushing to the file, so that I get as 
> much of the data that is available for analysis.
>   
>> When you put forward your questions about measuring Allan deviation i
>> saw that it were all the right & intelligent questions and perhaps this
>> is the reason why so many people are willing to enlighten you. I wish I
>> had known time nuts when i was in the same state of mind as you. Would
>> have saved me years of learning it the hard way!
>>
>>   
>>     
> Thank you. I am amazed at the amount and quality of support I got. I 
> intend to organize all the contributions in a web page. It seems like I 
> was not the only one with these questions, but everyone else was afraid 
> to ask :-)
>   
>> 73 de Ulrich, DF6JB
>>   
>>     
> 73, de Didier KO4BB
>
>
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>
>   
Didier

You may also find this useful

http://www.wenzel.com/documents/waveform.html

There are some other items that may be of interest at:

http://www.wenzel.com/documents/library.html

Though you may not want to build the water barometer!!

Bruce