I rushed out and ordered one, and I have to say, I'm impressed. The test report it came with states 34.4 ps risetime / 32.13 ps falltime 8.6% overshoot measured with a Tek CSA 803A. I hooked it up to my wonderful HP 54542 2 Gsamples/sec scope and got exactly what I would expect, 496 ps risetime 7.6% overshoot. Screenshot attached, don't know if it will actually make it into the post. This is exactly what I need for adjusting various of my time-related instruments. -- Bill Ezell ---------- The day Microsoft makes something that doesn't suck will be the day they make vacuum cleaners. Or maybe Windows 10.

It did make it to the post. Question. Rise and fall times are sub 40ps is that a typo in your email. Regards Paul WB8TSL On Mon, Oct 16, 2017 at 10:45 AM, BIll Ezell <wje@quackers.net> wrote: > I rushed out and ordered one, and I have to say, I'm impressed. > The test report it came with states 34.4 ps risetime / 32.13 ps falltime > 8.6% overshoot measured with a Tek CSA 803A. > I hooked it up to my wonderful HP 54542 2 Gsamples/sec scope and got > exactly what I would expect, 496 ps risetime 7.6% overshoot. > > Screenshot attached, don't know if it will actually make it into the post. > > This is exactly what I need for adjusting various of my time-related > instruments. > > -- > Bill Ezell > ---------- > The day Microsoft makes something that doesn't suck > will be the day they make vacuum cleaners. > Or maybe Windows 10. > > > _______________________________________________ > 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. >

For the HP54542A oscilloscope with 500 MHz BW, the risetime of the input will dominate. Recall that the total risetime is the square root of the signal and input channel risetimes squared and summed. So, it is expected. If he was using a CSA803 he would see significantly less. Cheers, Magnus On 10/16/2017 10:57 PM, paul swed wrote: > It did make it to the post. > Question. Rise and fall times are sub 40ps is that a typo in your email. > Regards > Paul > WB8TSL > > On Mon, Oct 16, 2017 at 10:45 AM, BIll Ezell <wje@quackers.net> wrote: > >> I rushed out and ordered one, and I have to say, I'm impressed. >> The test report it came with states 34.4 ps risetime / 32.13 ps falltime >> 8.6% overshoot measured with a Tek CSA 803A. >> I hooked it up to my wonderful HP 54542 2 Gsamples/sec scope and got >> exactly what I would expect, 496 ps risetime 7.6% overshoot. >> >> Screenshot attached, don't know if it will actually make it into the post. >> >> This is exactly what I need for adjusting various of my time-related >> instruments. >> >> -- >> Bill Ezell >> ---------- >> The day Microsoft makes something that doesn't suck >> will be the day they make vacuum cleaners. >> Or maybe Windows 10. >> >> >> _______________________________________________ >> 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. >

Hi One of the practical uses of a fast edge source is to measure the bandwidth / performance of a high speed acquisition circuit. It’s rare to find one that will not limit a ~30 ps rise time edge. Bob > On Oct 17, 2017, at 3:30 AM, Magnus Danielson <magnus@rubidium.dyndns.org> wrote: > > For the HP54542A oscilloscope with 500 MHz BW, the risetime of the input will dominate. Recall that the total risetime is the square root of the signal and input channel risetimes squared and summed. So, it is expected. If he was using a CSA803 he would see significantly less. > > Cheers, > Magnus > > On 10/16/2017 10:57 PM, paul swed wrote: >> It did make it to the post. >> Question. Rise and fall times are sub 40ps is that a typo in your email. >> Regards >> Paul >> WB8TSL >> On Mon, Oct 16, 2017 at 10:45 AM, BIll Ezell <wje@quackers.net> wrote: >>> I rushed out and ordered one, and I have to say, I'm impressed. >>> The test report it came with states 34.4 ps risetime / 32.13 ps falltime >>> 8.6% overshoot measured with a Tek CSA 803A. >>> I hooked it up to my wonderful HP 54542 2 Gsamples/sec scope and got >>> exactly what I would expect, 496 ps risetime 7.6% overshoot. >>> >>> Screenshot attached, don't know if it will actually make it into the post. >>> >>> This is exactly what I need for adjusting various of my time-related >>> instruments. >>> >>> -- >>> Bill Ezell >>> ---------- >>> The day Microsoft makes something that doesn't suck >>> will be the day they make vacuum cleaners. >>> Or maybe Windows 10. >>> >>> >>> _______________________________________________ >>> 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.