); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] RETRY Hi Dider:
I'll give that a try tomorrow. What does your camera setup look like? Digital SLR on tripod? Does that mean the TDS-210 can not do a screen dump to file? I've been looking at the Rigol DS1102CD mixed signal scope. The 100 MHz 2 analog channel & 16 digital channels is very reasonably priced. But after 3 emails I still have not been able to see a programming manual for it. Although they do have a software package. 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 Didier Juges wrote: > ); SAEximRunCond expanded to false > Errors-To: [EMAIL PROTECTED] RETRY > > I took some pictures of my Thunderbolt's PPS output. While it's pulse is not > quite as narrow as what you report, it's 10uS, way too narrow for the scope > to display it in normal ("Sample") mode at 250mS/div (the fastest setting > that will allow to measure the period of a PPS signal) on my TDS-210 digital > storage scope. > > There are at http://www.ko4bb.com/Test_Equipment/Thunderbolt/PulseStretching > > The names are self explanatory, but just in case :-) > > 1_PPS_10xProbe is the PPS measured at the end of a 3 foot cable with a 10x > probe > > 2_PPS_Sample Mode is the PPS signal in normal (sample) mode, as you probably > would see it on any DSO without any special mode. It's fair to say it would > be hard to make sure what you are seing or measuring. Please note that some > of the time, the scope triggers, but the trace is flat. I had to wait to > make this shot, which was the best I saw in about 30 seconds. > > 3_PPS_PeakDetect_Mode is the same signal, with the scope in Peak-Detect > mode. It is easy to check the period (if not very acurate). In this mode, > all sweeps look the same. > > 4_PPS_Diode is with a 1N4148 between the PPS output and the scope probe. See > how the 10uS pulse is now a solid 250uS at 1/3 the height. It would be much > easier to see on any scope, I need to pull the old trusty Tek 2245A and see > what it does on it. > > 5_PPS_Diode_5.6nF is the same diode with a 5600pF capacitor across the > probe. The pulse is now strecthed to ~10mS. > > 6_PPS_Diode_5.6nF is the same signal at the 250mS/div sweep rate. > > That's a heck of a lot cheaper than $45. Does not even need a power supply > :-) > > Didier KO4BB > > > > _______________________________________________ > 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.