Some sensing is done with a diode on a chip. Not exactly free air. Back when nicads ruled, I did a bit of temp testing for battery packs. Free air thermistors have so little mass that air currents have significant influence. You would need some processing of the sensor data.
-----Original Message----- From: "Jason Rabel" <[email protected]> Sender: [email protected] Date: Thu, 16 May 2013 13:46:19 To: <[email protected]> Reply-To: Discussion of precise time and frequency measurement <[email protected]> Subject: Re: [time-nuts] NTP Temperature Compensation Since most modern PCs have at least one temperature sensor on the motherboard, I wonder if it would be possible to monitor that to help compensate for temperature changes. I realize the locations of said sensor can be anywhere on the board, but you would think it could help out *some* amount. > i've seen that myself, NTP's compensation can almost be used as a way to > measure room temperature. You can see the AC cycles. For this reason I > keep the NTP server in a walk in closet that lacks heating duct. The room > temp cycles slowly. > > I've also read but can't remember where about a project to replace the TTL > can oscillator in a PC with a better quality one driven from a OCXO. That > is a lot of work for small gain. > > One thing about that study. I notice the author had t remove the PPS > reference clock. It looks like he was unabe to get the graph to move at > all with PPS attached. I'd like to see the same study done with a good > PPS reference clock let connected. Likely the results would be > uninteresting, just a flat graph. _______________________________________________ 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.
