[time-nuts] Scopes and 1 PPS signals?

WB6BNQ wb6bnq at cox.net
Tue Oct 23 18:28:31 EDT 2007


Hi Brook,

You could try using a 74123 (or newer variants) retriggerable one shot to extend
the pulse width to a level that would allow you to see it on the scope.

Bill....WB6BNQ

Brooke Clarke wrote:

> Hi:
>
> While trying to figure out the O-1814 Rb source I found a 1 PPS signal that's
> less than 10 us wide.  But using an HP 54501A DSO it's almost impossible to
> determine the period.  http://www.prc68.com/I/O1814.shtml
>
> If the display is 1,000 dots wide:
> at 2 us/sq the trace takes up about 4.5 squares or 450 dots,
> at 200 us/sq the trace takes up about 0.045 squares or 4 dots but the second
> pulse is way off screen.  At slower sweep speeds you can't see the pulse.
>
> Are there scopes that allow the period of a narrow pulse to be measured that
> don't cost an arm and leg?
>
> --
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
> http://www.precisionclock.com
> http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam
>
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