"John Tserkezis is a MASSIVE JERK"

So you live in a place _not_ on the grid?

Sigh.

I do live on the grid.

** He lives in Sydney - same as me.


I, along with everyone else was promised that
while short term timing errors on the grid are expected, longer term
errors are tweaked and by far less.
I could have lived with this if they actually meant it.

** The do actually - ****head.


However, in real life, it's STILL not good enough for clocks. Like I
said, I have many non-temperature crystal locked clocks that are by FAR
better.

** That is complete ********.


I have cheap Chinese digital watches (NOT on my wrist) at the whim of
the seasonal temperature environment that have minor seasonal shifts,
but over the year are better than mains-locked clocks.

** The problem is not with the frequency of the AC supply.


I can't even get a straight answer googling. Lots of nice graphs that
really don't answer the question too. The BEST was along the lines of
"is very precise" and "it shouldn't vary too far".

In engineering terms, that's just plain bull****.


** The supply grid has absolutely precise time keeping over the long term.

The PROBLEM is that any given premises may suffer losses of power for short
periods from time to time - over a year these all add up of course. And
they all add in the same direction !!!!

Most mains derived clocks react to a power outage by going into a mode where
the display blinks and the time resets to midnight or some such. OTHERS
( with battery back up) however revert to an internal oscillator that is
only based on a cheap R and C and give no warning that there has been an
outage.

The most common outages in homes are due to ELCBs and breakers tripping.


..... Phil