[time-nuts] Scopes and 1 PPS signals?
brooke at pacific.net
Tue Oct 23 19:23:58 EDT 2007
I'm sure that would work, but it's something else that needs to be done
sometime in the future.
I checked the pulse coming from the M12+T and it's more like 100 ms wide,
probably for this reason.
http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam
> 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.
> 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?
>>http://www.prc68.com/I/WebCam2.shtml 24/7 Sky-Weather-Astronomy Cam
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