[time-nuts] DDS, OCXO and ADEV

[Bob Camp]

Hi

Either the output data is with the counter set to time mode (and it’s in 100’s of ns) or you have it 
set to frequency mode and have a very stable system. 

Bob

> On May 2, 2015, at 9:53 PM, d0ct0r <time at patoka.org> wrote:
> 
> 
> Hello,
> 
> 
> I would like to create some charts for ADEV for following setup:
> 
> HP5386A counter connected to External REF. (OCXO). The input of counter connected to my DDS VFO. The frequency on VFO is 2853000 Hz.
> 
> Here is what I got from counter via GPIB:
> 
> S +3.505082408E-7
> S +3.505082408E-7
> S +3.505082408E-7
> S +3.505082408E-7
> S +3.505082408E-7
> S +3.505082408E-7
> S +3.505082408E-7
> S +3.505082409E-7
> S +3.505082408E-7
> S +3.505082409E-7
> S +3.505082408E-7
> S +3.505082408E-7
> S +3.505082408E-7
> 
> I converted it to following form:
> 
> 0.0000003505082409000000
> 0.0000003505082409000000
> 0.0000003505082409000000
> 0.0000003505082408000000
> 0.0000003505082409000000
> 0.0000003505082409000000
> 0.0000003505082409000000
> 0.0000003505082409000000
> 0.0000003505082409000000
> 0.0000003505082409000000
> 0.0000003505082409000000
> 0.0000003505082409000000
> 0.0000003505082409000000
> 0.0000003505082409000000
> 0.0000003505082409000000
> 
> Then I tried to use ADEV by tvb (long life to Tom!). See attached file 1b.bmp
> 
> And I tried to create the charts for the collected data. See attached file 1a.bmp.
> 
> But it seems I am doing something wrong. Any advises will be greatly appreciated. Thanks !
> 
> 
> -- 
> WBW,
> 
> V.P.<1a.png><1b.png>_______________________________________________
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