[time-nuts] Using a UBlox NEO-6 GPS module for calibrating a PIC microprocessor based timer.

Attila Kinali attila at kinali.ch
Sun Dec 1 22:52:46 UTC 2013


On Sun, 1 Dec 2013 13:57:56 -0500
"Dale J. Robertson" <dale at nap-us.com> wrote:

> A unidirectional error of 1/100th of a second would accumulate around a 
> minute and a half per day. It's been a long time since I laid eyes on a 
> mechanical pendulum clock. I remember the clock in my childhood home kept 
> better time than that. ( I became odd very early. I compulsively compared 
> the clock time to WWV time at least once a day. I had been using the time 
> service from the phone company. I felt defrauded when I discovered (via WWV) 
> that the time from the local telco's dialup time service was just a rough 
> (very rough) approximation of the time.

IIRC 10^-6 was "easily" acheivable with mechanical clocks, with the
best going to 10^-8 or so (timescale IIRC 1 day). 

			Attila Kinali

-- 
1.) Write everything down.
2.) Reduce to the essential.
3.) Stop and question.
		-- The Habits of Highly Boring People, Chris Sauve



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