It would be a simple experiment. All you need is a known good square wave oscillator that can produce a stable signal at RS232 voltage levels.
Linus PPS comes with a test tool that will print the events like this found PPS source "/dev/pps0" ok, found 1 source(s), now start fetching data... source 0 - assert 1186592699.388832443, sequence: 364 - clear 0.000000000, sequence: 0 source 0 - assert 1186592700.388931295, sequence: 365 - clear 0.000000000, sequence: 0 source 0 - assert 1186592701.389032765, sequence: 366 - clear 0.000000000, sequence: 0 The above test shows time of each event and the sequence number. One would have to import this to a spread sheet or write software but not hard core programming required On Wed, Jun 29, 2011 at 12:19 PM, Scott Newell <new...@cei.net> wrote: > At 02:14 PM 6/29/2011, Tom Van Baak wrote: > >> Out of curiosity, if anyone on the list has pointer to papers that >> show actual measurements of desktop systems used as precise >> timing devices let me know. Not external boxes or PCI cards, but >> using the OS itself as a timer. I'm sure with care 1 us or even >> 100 ns is possible. For example, how accurate is the best NTP >> system? But this is still a thousand times more jitter than plain >> logic circuits and a million times worse than specialized TIC's. >> >> Reply off-line, I know this is getting very off-topic. > > Please don't take that off-line! I'd say this is pretty on-topic for > time-nuts. Maybe it just needs a different subject line. > > -- > newell N5TNL > > _______________________________________________ > 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. > -- Chris Albertson Redondo Beach, California _______________________________________________ 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.
