[time-nuts] 1PPS for the beginner

[Peter Vince]

I was astonished to see the pulse-width in the document defined from the
base of the (sharp-cornered!) edges, and not the mid-point - totally
impractical!  Near the top of the previous page it says: "If required for
testing purposes, the pulse width at the 50% level may be determined by
extrapolation."  Now OK, the very wide tolerance on the pulse-width makes
this all rather academic, but surely that spec wasn't written by an
engineer? :-)

     Peter

On 15 August 2018 at 05:03, Björn <bg at lysator.liu.se> wrote:

> Hi Bernd,
>
> One reference to 20us 1PPS pulse length is the ICD-GPS-060, see figure
> 3-2, page 3-3 (pdf page 19)
>
> https://www.navcen.uscg.gov/pdf/gps/ICD-GPS-060B.pdf
>
> Group - Are there other standard documents defining duty-cycle, voltage
> levels, rise times etc?
>
> MfG
>
>      Björn
>