[time-nuts] ADEV computed, now what?

[Bob Camp]

Hi

What you have measured is the trigger error of your 5334. Since the 10 MHz and the pps are from the same source, all that’s left is trigger.

Bob

On Feb 4, 2014, at 9:45 PM, Bob Stewart <bob at evoria.net> wrote:

> I think I have the unwrapping and scaling sorted out, so here's the result for 1PPS vs 10MHz for my GPSDO, as measured by a 5334B clocked by the same 10MHz.    I don't know how to read these, but 6,3,1,6,3,1 etc. doesn't look normal.  I wonder if that merely reflects the consumer grade GPS receiver I'm using (Adafruit Ultimate Breakout), rather than a reflection on the ultimate result?  I can link to a plot of the 1PPS vs 10MHz if that's wanted.
> 
> 
> Any comments appreciated.
> 
> 
> ** Sampling period: 1 s
> ** Phase data scale factor: 1.000e-09
> ** Total phase samples: 86399
> ** Normal and Overlapping Allan deviation:
> 
>        1 tau, 6.1669e-09 adev(n=86397),     6.1669e-09 oadev(n=86397)
>        2 tau, 3.2413e-09 adev(n=43198),     3.2349e-09 oadev(n=86395)
>        5 tau, 1.2603e-09 adev(n=17278),     1.2470e-09 oadev(n=86389)
>       10 tau, 6.0606e-10 adev(n=8638),      5.9837e-10 oadev(n=86379)
>       20 tau, 3.1173e-10 adev(n=4318),      3.0967e-10 oadev(n=86359)
>       50 tau, 1.2778e-10 adev(n=1726),      1.2618e-10 oadev(n=86299)
>      100 tau, 6.2970e-11 adev(n=862),       6.3607e-11 oadev(n=86199)
>      200 tau, 3.6391e-11 adev(n=430),       3.2994e-11 oadev(n=85999)
>      500 tau, 1.4055e-11 adev(n=171),       1.4008e-11 oadev(n=85399)
>     1000 tau, 8.4596e-12 adev(n=85),        7.8291e-12 oadev(n=84399)
>     2000 tau, 4.8688e-12 adev(n=42),        5.0306e-12 oadev(n=82399)
>     5000 tau, 3.7358e-12 adev(n=16),        4.1679e-12 oadev(n=76399)
>    10000 tau, 3.7403e-12 adev(n=7),         3.5550e-12 oadev(n=66399)
>    20000 tau, 1.9271e-12 adev(n=3),         2.6676e-12 oadev(n=46399)
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