Here we go again C -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Poul-Henning Kamp Sent: 26 June 2010 21:06 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] EFC tracking
In message <4c265bb1.8090...@earthlink.net>, jimlux writes: >sound card ADCs, the high end 24 bit ones, are pretty darn linear [...] That is actually a very debatable proposition, a lot of them are tracking types that conveniently cover up any lack of linearity on the analog side of the fence. The major problem with using sound ADC's is that their references has absolutely no long term stability, so you will see your EFC wiggle and wander all over the place, even when it stays perfectly still. I would find one of those cheap-ish DVM's with a serial or USB port... -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 p...@freebsd.org | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ 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. _______________________________________________ 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.
