); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY 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" <[EMAIL PROTECTED]> To: "Discussion of precise time and frequency measurement" <time-nuts@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: [EMAIL PROTECTED] RETRY > > > > I presume it has a calibrated delayed TB how about using that ?? > > Alan G3NYK > > > > ----- Original Message ----- > > From: "Brooke Clarke" <[EMAIL PROTECTED]> > > To: "Discussion of precise time and frequency measurement" > > <time-nuts@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 > >> > >>_______________________________________________ > >>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.