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Re: [gpsd-dev] Clarifications needed for the time-service HOWTO

From: Gary E. Miller
Subject: Re: [gpsd-dev] Clarifications needed for the time-service HOWTO
Date: Wed, 23 Oct 2013 12:06:33 -0700

Yo Hal!

On Wed, 23 Oct 2013 11:12:45 -0700
Hal Murray <address@hidden> wrote:

> > We are just going for stability.
> Huh?
> A clock that is stable but wrong isn't helpful.

For some definitions of "wrong".  I would turn it around and ask you how
you can know a clock is "right"?  Is the current definition of a kilogram
wrong becase it only goes to 7 digits?  We can go to 10 with PPS!

If I can only comfirm, by tracing to a national standards body, that
my time is only good to 4 digits, is my time "wrong"?

I suggest you get a good book on metrology.

"accuracy" is what yuo can prove beyond the shaodw of a dout.
"resolution" is what you can measure.

Do not confuse accuracy with reslution.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588

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