[time-nuts] How to measure Allan Deviation?

[Dr Bruce Griffiths]

Didier Juges wrote:
> Here are my $0.02...
>
> Magnus Danielson wrote:
>   
>> From: Dr Bruce Griffiths <bruce.griffiths at xtra.co.nz>
>> Subject: Re: [time-nuts] How to measure Allan Deviation?
>> Date: Tue, 24 Oct 2006 10:52:21 +1300
>> Message-ID: <453D3995.8080004 at xtra.co.nz>
>>
>>   
>>     
>>> Tom
>>>     
>>>       
>> Hi Bruce,
>>
>>   
>>     
>>> In comparing 2 oscillators do you mean
>>>
>>> 1) Connecting one oscillator to the FREQ STD input at the rear of the 
>>> 5370A, selecting the external timebase and connecting the other 
>>> oscillator to the Front panel FREQ/PERIOD input and then selecting 
>>> frequency measurement which in effect gives the frequency ratio of the 2 
>>> oscillators?
>>>     
>>>       
>> I have advocated this approach, but nobody seemed to care.
>>
>>   
>>     
> HP says in the 5316B manual (probably in other manuals, but that's where 
> I saw it first), that it is best to compare 2 oscillators by plugging 
> them in START and STOP respectively, but NOT to use one as a standard, 
> because averaging works better (or simply, works) when the internal 
> standard is async with either START or STOP signals.
>   
>> Cheers,
>> Magnus
>>   
>>     
>
> Didier
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>   
This may also be helpful in mitigating the effect of some of the 
differential linearity errors of the HP5370A

Bruce