Newsgroups: sci.electronics.misc
Subject: Re: Faraday Cage
References: 
"RIEGER"  writes:

> im having problems with my CRT monitors. they flick ( checked couple units ) 
> I live next to street power line. ( my wall on 3rd floor  is couple feet 
> from it )
> dont flick on 60Hz refresh ratio but higher yes- badly.
> 
> 120 Hz is small but ennoying flicking only ( image looks blury )
> 
> Is there a way to shield my monitor from it? 

Mu Metal is the generic name for for a high-permeability, magnetically
"soft" alloy used for magnetic shielding. It includes about 80% nickel
and 15% iron, with the balance being copper, molybdenum or chromium,
depending on the recipe being used.

I have seen shielding boxes for industrial monitor made from 
mu metal advertised by some company. Those coudl help somewhat.

> Will socalled Faraday Cage solve the problem? 

Most propably not. Faraday Cage is designed to shield against 
electrical fields. It is good at that, but not effective 
against low frequency magnetic fields. 

> Mumetals? They're expensive.

Mu metals are one option. 

Sometimes just normal iron/steel sheets can help. 


> I have a gaussometer EMF reading read by a specialist from my gas electr 
> spupplier
> 
> here it is - http://www.wolosik.com/pseg.jpg
> 
> i have almost 12 miligausse in my place - how to lower it in a cheap way?
> 
> i dont want LCD minitor
> 
> Any links to EMF shields suppliers?

I have no links to give.
 
> BTW - checked all other factors ( no magnetic sources around no electricity 
> problems and my next door neighbour has the same think with his DELL 
> monitor)
> 
> Tom 
> 
> 

-- 
Tomi Engdahl (http://www.iki.fi/then/)
Take a look at my electronics web links and documents at 
http://www.epanorama.net/