[GTALUG] mysterious restarts

Lennart Sorensen lsorense at csclub.uwaterloo.ca
Mon Jun 20 11:52:01 EDT 2016


On Mon, Jun 20, 2016 at 10:54:44AM -0400, Christopher Browne wrote:
> Interesting if the synchronization has gotten lost.
> 
> For quite a long time, electric clocks were often synchronized based on the
> 60hz; apparently the Hammond Clocks were from the same Hammond more noted
> for producing organs, which apparently also used power line frequency
> stability to stay in pitch... <https://en.wikipedia.org/wiki/Hammond_organ>
> 
> In the early days of quartz crystal clocks, they did *not* give as good
> stability as the "beats" provided by the 60hz of the power grid.  It seems
> interesting if the power grids have decided to ignore this.  While the
> clock application has become much less relevant, I would imagine it easier
> to maintain exact cadence today, with there being more precise clocks.

I suspect the power grid is doing fine, I just don't know if I trust
the APC to be measuring it that accurately.

-- 
Len Sorensen


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