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Ralf Mardorf wrote:

quoted text
>

>

> -------- Original Message --------

> Subject:     Re: [LAD] A little quiz about audio measurements...

> Date:     Fri, 28 May 2010 21:17:38 +0200

> From:     Ralf Mardorf

> To:     Veronica Merryfield

> CC:     Linux Audio Developers

> References:     <20100528123116.GA4058@zita2>

>

> <20100528153747.GF4042@zita2>

>

> <4C000DC7.1030709@alice-dsl.net>

> <719832DC-9545-4B5A-8D5E-EE5F7F962867@tesco.net>

>

>

>> [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_Ar...
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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