[LAD] A little quiz about audio measurements...

[fons at kokkinizita.net]

On Fri, May 28, 2010 at 11:24:29PM +0200, Ralf Mardorf wrote:

> 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,

-- 
FA

O tu, che porte, correndo si ?
E guerra e morte !