Hi all, I'm studying computer's timekeeping and i'm on level of remove the base crystal that feeds the entire PLL logic of the motherboard (24 MHz on motherboard that i'm using) and compare system's time with an NTP server.
The 24 MHz comes from an synthesizer that is locked to an atomic clock, the clock of NTP server (also 24 MHz, but an embedded board (Tinkerboard)) also comes from the same Atomic clock that is feeding other synthesizer for generates 24 MHz to this board. The experiment is the following: 1- synchronize the computer's clock to NTP server then leave it running free (no periodic synchronization), 2 - acquire time difference between computer and time server. What i'm observing is that the computer time is drifting over time, but theoretically it cannot drift because its connected to same clock source (the atomic clock) of the time server. My question is: what i'm missing? Someone have some tips to me to research about timekeeping with base clock? I've already changed the base clock in some hertz (frequency correction based on the drift) at the synthesizer, but seems to have no effect, times keep drifting at constant rate, this means that the "1sec pulse" generated in system to count time is not truly 1 sec pulse, this because the system is in an different frequency of my ntp server time pulse. Thank you for your time and happy new year, Luiz _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
