All, Ok... so i'll just make it a rising edge pulse of ~500ms. That should be enough time for a linux box to detect it.
Thanks, -Lenny On Mon, Mar 28, 2011 at 6:54 PM, Rex <[email protected]> wrote: > On 3/28/2011 9:46 AM, Lenny Story wrote: > >> Greetings, >> >> Is there an accepted form for the PPS clock pulses that are produced >> by the various time equipment in use today ? >> >> >> > Short answer -- No. > > Examples: > HP GPSDOs like 3801A and 3816A have a positive-going square pulse that is > 10's of microseconds long. From the 3801 manual, "1 PPS Output > Characteristics > Jitter of leading edge: < 200 nanoseconds between pulses. > Accumulated time error: < 7 microseconds per day unlocked, for > 24 hours, after one day of stabilization and 2 days of locked operation > with a fixed antenna location. > Waveform: Pulse width 10 to 50 microseconds. > Time Accuracy: < 1 microsecond (Locked to GPS) > Connector: DBÂ25 (J3)" > > I just looked at the PPS from my 3816A and it is about 3V into 50 ohms and > a bit over 20 uS long. > > The T-bolt manual says 10 uS wide and can be configured either positive or > negative pulse. > > Looking at the M12 receiver manual, looks like a 6-7 mS pulse. > > > > _______________________________________________ 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.
