[time-nuts] Meaning of GPSCon "Graph" terms

Azelio Boriani azelio.boriani at screen.it
Thu Apr 4 12:30:43 UTC 2013


Since the GPSCon software is not free, I suppose it must have a complete
documentation and full support from the vendor.

On Thu, Apr 4, 2013 at 2:01 PM, James Robbins <jsrobbins at earthlink.net>wrote:

> I'm using GPSCon software on my Fury but I'm not clear as to the meaning
> of some of the terms which populate the "Graph" display?
>
> 1.  At the top "EFC" graph (red), what do "ad=0m" and "sd=0m" mean?  Is
> "ad" Allan Deviation?  How do these numbers relate to the usual frequency
> scales we see of so many parts per billion or whatever?  Deviations from
> what?
>
> 2.  At the lower "TI" graph (blue), what do "av=-0.12n" and  "sd=1.4n"
> mean?  I assume they are nanosecond averages, but are they averages over
> the entire reading period and what do they signify?
>
> 3.  The green scale numbers in the EFC graph show "432us", "6.5us" and
> "100ns".  What do these numbers mean?
>
> 4.  The "TI" scale shows "4.3ns to -3.1ns".  From what baseline are these
> the maximum excursions?
>
> 5.  What is the meaning of "LPF -0.2ns"?
>
> 6.  Does the slope (up or down) of the gold line in the EFC section
> (general trend) indicate something?
>
> 7.  The "TI to GPS" box seems to show a time interval (e.g. 7.2E-10).  Is
> this an instantaneous reading or an average?  What is being compared to
> what?
>
> 8.  What does the "3.1e-005" along the left side of the EFC graph mean?
>
> 9.  Does this software provide Allan Deviation results?
>
> Many thanks for the explanations.
>
> Jim Robbins
> N1JR
>
>
>
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