); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hi Daun:
The previous message suggested using a 74123 one shot, and the FatPPS uses a 74HC123. But $45 seems a bit high for just this measurement. 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 Daun Yeagley wrote: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > 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: > http://www.tapr.org/kits_fatpps.html > > Daun > > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf > Of WB6BNQ > 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? > > 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 >> >>_______________________________________________ >>time-nuts mailing list -- time-nuts@febo.com >>To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>and follow the instructions there. > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.