Jim, Really annoying feature of HP counters.
If you slowly drift from a positive period to a negative one, it will indicate negative numbers for a while. Then almost sudden it will do the jump to 0.99999xxxx seconds. I found that adding a phase delay (long cable) helps keep the numbers positive. Or trigger one on the rising, and one on the falling edge to add 50ns delay ( for signals with good 50% duty cycle). Bye, Said On Jun 11, 2013, at 21:13, Jim Palfreyman <[email protected]> wrote: > Folks, > > I'm struggling to understand this button and how it reports intervals. It's > supposed to show negative when the Stop is before the Start. > > When I connect up two clocks sending out 1PPS and say the one connected to > Stop is ahead then sometimes I'd get -123.45 ns (say) and sometimes it > flips to 999.999... ms. It can't seem to make up its mind which to use. > > Why is this inconsistent? > > If I flip it to + TI and make sure the leading clock is on Start - all > works well. > > Thoughts? > > Jim Palfreyman > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
