[time-nuts] Why are PPS pulses so narrow? (was: 53132A triggering)
petervince1952 at gmail.com
Sat Sep 17 13:09:56 EDT 2016
Thanks guys - interesting answers all!
On 17 September 2016 at 18:00, Chris Albertson <albertson.chris at gmail.com>
> On Fri, Sep 16, 2016 at 4:44 PM, Peter Vince <petervince1952 at gmail.com>
> > Can I ask why PPS pulses are so narrow? It makes them difficult to see
> > a 'scope, and difficult to detect on a PC. And, as Bob said, far less
> > obvious if you trigger off the wrong edge.
> None of us can guess the original designer's motivation but...
> I think you answered your own question "far less obvious if you trigger off
> the wrong edge.". For most cases, except for time nuts, a few
> microseconds does not matter. So the GPS PPS works almost as good if you
> invert the signal and trip off the wrong edge. Yes it makes such a
> mistake hard to find but, I think that was the point.
> Chris Albertson
> Redondo Beach, California
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