John, in a lot of cases such "accuracy" specs are specified (without being explicitely mentioned) for ONE sigma of the statistical distribution of the pulses. In your case this would mean that 66% of the pulses are within +/- 50 ns and 99% of the pulses are within +/- 150 ns. These numbers apply exactly only to normal distributed values but in any case give you an idea of what you may expect.
Best regards Ulrich Bangert > -----Ursprungliche Nachricht----- > Von: [email protected] > [mailto:[email protected]] Im Auftrag von John Green > Gesendet: Montag, 20. Dezember 2010 17:03 > An: [email protected] > Betreff: [time-nuts] Ublox GPS board > > > I recently bought 4 older UBLOX GPS boards on eBay for $15 > with free shipping. I hooked one up to my 1992 and comparing > it with the Z3801, I am seeing it jump all over the place. I > am using the 10 MHz output from the 3801 to start and the 1 > PPS from the UBLOX to stop. I will have to bring in a TBolt > just to verify the test set up. Has anyone here ever made any > measurements on the UBLOX TIM-LF-0-000? These are not timing > grade, by the way. The spec. sheet says the accuracy of the > time pulse is 50 nSec. If that is +/- 50, then what I am > seeing might be OK. > > _______________________________________________ > 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.
