Re: [time-nuts] x86 CPU Timekeeping and clock generation

2021-01-05 Thread Hal Murray
> My question is: what i'm missing? Two ideas come to mind. Most PCs (and servers) smear the CPU clock frequency slightly to dance around the FCC rules. The chip that does that will have slight temperature influence so even if everything else is working right there will be tiny changes if y

[time-nuts] x86 CPU Timekeeping and clock generation

2021-01-05 Thread Luiz Paulo Damaceno
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, t

Re: [time-nuts] PRS10 not locking to 1PPS

2021-01-05 Thread Stewart Cobb
> > > > Hello Time-Nuts, > > > > I am an user of a PRS10 Rubidium standard. > > The unit has firmware revision 3.15. > > After reset to factory settings the Time Offset (TO) was set to 1814. > > Normally it was -1814. Now de PRS10 is not locking to the 1PPS anymore. > > It will freeze when PL = 1.