"Richard B. Gilbert" <[EMAIL PROTECTED]> writes: > If you want to make a one-time correction to your clock frequency, 500 > ms/day may be a reasonable objective. As Terje pointed out, the > frequency varies with temperature and the temperature varies with the > time of day, season of the year, whether the heat is on or off, etc. > The frequency will also change, slowly, as the crystal ages.
Modern motherboards all seem to have the ability to read the ambient temperature. It might be possible to null out some of the temperature variation of the xtal by generating a table of ppm-offset vs. reported temperature while ntpd is running. Then when the system runs open loop at some later time, some fairly simple hack can load different ppm corrections depending on the reported temperature. -wolfgang -- Wolfgang S. Rupprecht http://www.wsrcc.com/wolfgang/ Direct SIP URL Dialing: http://www.wsrcc.com/wolfgang/phonedirectory.html _______________________________________________ questions mailing list [email protected] https://lists.ntp.isc.org/mailman/listinfo/questions
