[SI-LIST] Re: Floating Cable Shield
- From: "Andrew Ingraham" <a.ingraham@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Sat, 28 Oct 2006 11:17:05 -0400
> ... if I understand correctly, the case is made that while a
> shield grounded at one end only can be effective for reducing
> capacitively ("electrostatic") coupled noise, it is useless for
> inductively ("electromagnetic") coupled noise - that requires grounding
> at both ends to be effective.
It's my understanding as well that the shield ought to be "grounded" (i.e.,
have a current path) at both ends to be fully effective against
electromagnetic noise, on the large scale. But on the other hand, even a
floating shield does affect local inductive coupling from nearby sources, by
setting up eddy currents which tend to cancel some of the AC (varying)
magnetic fields.
Regardless, the mere presence of metal affects the EM fields in some way,
whether or not it is grounded. Could be either for the better or for the
worse.
Andy
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