29 May
2010
29 May
'10
12:42 a.m.
fons(a)kokkinizita.net wrote:
On Fri, May 28, 2010 at 11:24:29PM +0200, Ralf Mardorf
wrote:
The meter is bad. As I've written before (I fetched your mail), you're
right, the tolerance is < 0.2 Hz (< 0,4%), but 1 Hz (2%) ;).
Oberhausen, Rheinland, Germany; power line
frequency right now is at
49 Hz, measured with a low cost energy consumption costs meter.
Those low cost meters shouldn't be able to do correct measurements
;). The best test at home might be to compare the sound of a
transformer with a 50 Hz sine wave.
49 Hz is impossible. It would mean that a clock using this
frequency would be slow by more than a minute per hour.
Long-term accuracy is extremely high, precisely because clocks
depend on it. And since almost all of Europe is interconnected,
adjusting the frequency must be a _very_ slow process. So errors
of 2 percent really can't be tolerated.
Ciao,