[time-nuts] Scopes and 1 PPS signals?
daun at yeagley.net
Tue Oct 23 18:37:19 EDT 2007
What you need then is the FatPPS from TAPR. Our own John Ackermann (N8UR)
designed it primarily for use with time servers by stretching the 1PPS pulse out
to several milliseconds so that the computer could see it. I suspect the same
principle would be useful for a scope. Check out:
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf
Sent: Tuesday, October 23, 2007 6:29 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Scopes and 1 PPS signals?
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.
Brooke Clarke wrote:
> 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/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam
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