Ralf Mardorf wrote:
-------- Original Message --------
Subject: Re: [LAD] A little quiz about audio measurements...
Date: Fri, 28 May 2010 21:17:38 +0200
From: Ralf Mardorf <[email protected]>
To: Veronica Merryfield <[email protected]>
CC: Linux Audio Developers <[email protected]>
References: <20100528123116.ga4...@zita2>
<[email protected]>
<20100528153747.gf4...@zita2>
<[email protected]>
<[email protected]>
<[email protected]>
[snip]
> The times I have measured the power line frequency to check it's
effect or otherwise, I have not measured it as exactly 50.0hz (when I
lived in the UK). >
> Vrnc
[snip]
OT followup:
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.
Really OT, but maybe anyway interesting, regarding to a German Wiki,
http://de.wikipedia.org/wiki/Netzfrequenz:
Because of magnetostriction of the ferrite core, the sound of
transformer stations is at 100 Hz. Dunno if this is the same for
transformer in our power supplies too.
The load of the public power supply will change the frequency in Western
Europe < 0,2 Hz. When there was a blackout at 11/04/2006 the frequency
change like this:
http://de.wikipedia.org/w/index.php?title=Datei:Netzfrequenz_20061104_Area_1.jpg&filetimestamp=20061112123742
Regarding to the German Wiki http://de.wikipedia.org/wiki/Unterfrequenz
all power stations need to disconnect at 47.5 Hz. At 49.8 Hz there is an
alert.
We should assume that the frequency in Western Europe is solid 50.19 to
49.81 ;).
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