Hi
> On Nov 29, 2017, at 5:16 PM, Andy ZL3AG via time-nuts <time-nuts@febo.com> > wrote: > > > HP 5359A Time Synthesiser? 100 to 200 ps jitter …. he’s after <5 ps Bob > > > On 30/11/2017, at 10:24 AM, Leo Bodnar wrote: > >> I am looking for an established and widely accepted procedure for verifying >> performance of high resolution time counters. >> >> I have designed a time stamping counter for qualifying 1PPS signal >> performance against external reference (e.g. 10MHz master clock.) >> >> Simple design verification check I am doing at the moment is gating random >> selection of master clock edges back into device's signal input and letting >> the device measure this test signal offset against its reference clock - >> which, for ideal design, should result in zero offset (modulo 100ns.) My >> results are roughly in line with what I expect to see >> http://leobodnar.com/balloons/NTP/time-sampler-test1.png >> >> Now, what would be recognised procedure for sweeping external input pulse >> delay over few hundred ns in a controlled, measurable and repeatable way? >> >> I can see few naïve approaches: >> 1) Using selectively gated (or divided) reference clock followed by >> adjustable delay line. E.g. something like mechanically adjusted delay >> lines used in HP test sets. Or, perhaps, calibrated rigid coax sections? >> 2) Slightly offset another master clock (e.g. second Rb oscillator) gated in >> a similar way but without delay line, followed by statistical data analysis >> 3) Trusted pulse generator with high resolution delay adjustment fed from >> the same master clock as the counter >> >> I am looking for something with ~10ps accuracy, 100ns+ range, and reasonably >> low jitter (~5ps or better.) >> It is possible that the range needs to be split up (e.g. fixed rigid coax >> delay line followed by a mechanically adjust section.) >> >> This is a low budget fun project so something simple and common sense is >> preferred to "price on application" NIST traceable equipment. >> >> Thanks! >> Leo >> _______________________________________________ >> 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.
