[time-nuts] PPS for NTP Server - How Close Is "Good Enough"?
hmurray at megapathdsl.net
Fri Jun 12 03:20:36 UTC 2015
m.matthew.george at gmail.com said:
> As you can see, the PPM frequency on this Pi is still showing -7.742. I
> assume that is if it was undisciplined? I have wondered about that.
That's the fudge factor needed to make that box keep reasonable time.
At one level, it's the difference between the number printed on the
oscillator package and the actual frequency coming out of the package. On
another level, it's what the kernel measures at startup time. That
measurement includes things like spread spectrum (EMI) and bugs in the
It's usually a good thermometer.
These are my opinions. I hate spam.
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