Magnus, you are right, I forgot to mention that without a time-stamping counter it is better to offset the PPSes. With a time stamping counter more cases can be treated such as a free oscillator.
On Sat, Jul 6, 2013 at 8:53 PM, Charles P. Steinmetz <[email protected]> wrote: > Magnus wrote: > >> For +/- TI mode, using a separate ARM does not help either, since either >> of the channels suffice as trigger, and the relative timing is resolve >> dynamically by the counter. For most time, the dead-time will be hidden, but >> for longer runs where A/B timing diverge, it can create the same issues as >> the remaining time from the STOP to the START (as the sequence now has been >> assigned and maintained) can become to short to cover up the dead-time. > > > But that is the thing about using ARM as I described -- the sequence is NOT > maintained, it is generated fresh every period (every second, in my > example). So every period, you get a + or - TI reading depending on which > trigger event (START or STOP) occurs first after the ARM pulse. Of course, > this depends on the START and STOP events always being much closer to each > other than 1/2 the measurement interval (in my example, two 1 pps signals > that are always within 100 mS of each other; in reality, this could even be > 300 mS if the ARM pulse is accurately located). > > I did not have any trouble with a dead zone. I think this is because if the > counter misses a trigger, it will always be re-armed before the next > terminating trigger event occurs, so it would just not report a time for > that period. > > Or have I misunderstood what you were saying? > > Best regards, > > Charles > > > > > > _______________________________________________ > 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.
