[time-nuts] Scopes and 1 PPS signals?

Alan Melia alan.melia at btinternet.com
Tue Oct 23 19:40:50 EDT 2007


Hi Brooke, ah well its probably a case of "not the right instrument for the
job...." but that's a bit tough if its all you got, maybe the extra delay
mentioned by others is what's called for. My old analogue scopes will do it
:-)) Im surprised you can only get 10 screens worth delay. Some scopes will
allow delay and sweep on different ranges of the TB.

Alan

----- Original Message -----
From: "Brooke Clarke" <brooke at pacific.net>
To: "Discussion of precise time and frequency measurement"
<time-nuts at febo.com>
Sent: Wednesday, October 24, 2007 12:20 AM
Subject: Re: [time-nuts] Scopes and 1 PPS signals?


> Hi Alan:
>
> I tried.  At 100 ms/sq the second pulse would be just off screen to the
right.
>   At 200 ms/sq the second pulse should be at center screen.  Using the
window
> function the window time base can be no more than 10X faster than the main
> trace which would be 20 ms/sq, way too slow to see the pulse.
>
> 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
>
>
> Alan Melia wrote:
> > ); SAEximRunCond expanded to false
> > Errors-To: time-nuts-bounces+brooke=pacific.net at febo.com RETRY
> >
> > 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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> >
> >
> >
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