[time-nuts] Scopes and 1 PPS signals?

Alan Melia alan.melia at btinternet.com
Tue Oct 23 22:23:04 UTC 2007


I presume it has a calibrated delayed TB how about using that ??
Alan G3NYK

----- Original Message -----
From: "Brooke Clarke" <brooke at pacific.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Tuesday, October 23, 2007 11:05 PM
Subject: [time-nuts] Scopes and 1 PPS signals?


> 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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