OT: CRT EMI Shield

From: Ed Kelleher <Pres_at_macro-inc.com>
Date: Tue Jun 1 11:31:28 2004

At 12:09 PM 6/1/2004, you wrote:
>Purists would use mu-metal; if the plain steel works, mu-metal would
>work better. But it's probably hard to find.

Plus MuMetal is sensitive to mechanical working.
Beating a piece to straighten it out will reduce it's effectiveness.

Galvanized sheet steel used in AC ducting should be fine.
As would a skin from a computer chassis.
Layering might help.
Also, the sheet might need to extend past the sides, and front and back of
the monitor to intercept lines of flux from source.

I wonder if degaussing the target monitor (one with interference),
while the source monitor (creating the interference) was operating, would help?

Some monitors have a built in degaussing function.
Others do it when they power up.

The above all assumes a magnetic interference.
If it's localized to one, or a few, spots on the screen, with color shifts,
that's likely what it is.

Of course that gets me to thinking of TEMPEST and someone reading your
monitor from out in the street. :-)

Ed
Received on Tue Jun 01 2004 - 11:31:28 BST