In message <201106270013470285.1b239...@smtp.citynet.net>, "Will Matney" writes : >Here's another thought on all of this. How will this effect the newer >electronic watthour meters at peoples homes? I remember looking at the >schematics on one of these, and I don't remember seeing an internal time >base, crystal, or resonator in the circuit, so I suppose they might get >their timing from the 60 Hz line.
Modern microcontrollers contain a on-chip resonator, typically 8MHz, which is surprisingly stable, often a lot more stable than the mains frequency. Electricity meters are usually only precise to 1 or 2%. -- 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.
