linuxaudio.org

fons@kokkinizita.net wrote:

quoted text
> 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,

>   

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%) ;).

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