[SI-LIST] Re: Traces don't cause EMI - really?
- From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
- To: "'alexh1@xxxxxxxxxxxxx'" <alexh1@xxxxxxxxxxxxx>,"'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 17 Oct 2003 12:39:30 -0600
It shouls have a label that says Assembled
from FCC Compliant products (or something like
that) on the back.
Best Regards
Charles Grasso
Senior Compliance Engineer
Echostar Communications Corp.
Tel: 303-706-5467
Fax: 303-799-6222
Cell: 303-204-2974
Email: charles.grasso@xxxxxxxxxxxx;
Email Alternate: chasgrasso@xxxxxxxx
-----Original Message-----
From: Alex Horvath [mailto:alexh1@xxxxxxxxxxxxx]
Sent: Friday, October 17, 2003 12:32 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Traces don't cause EMI - really?
Probably getting off topic here but my computer which is not a name brand,
was simply assembled from components and has none of the obvious EMI
preventative measures like gaskets, filters etc that you see on a name
brand. Also, it was never EMI tested as a unit. So is this unit legal from
an FCC emissions standpoint?
Lfresearch@xxxxxxx wrote:
In a message dated 10/17/2003 1:09:11 PM Central Daylight Time,
alexh1@xxxxxxxxxxxxx writes: Assuming the EMI testing that's done for CISPRB
and CE is done with a base configuration (no added PCI cards, etc.), the
inclosure could be providing a great deal of the necessary shielding. The
mother board itself would then not need to be especially clean. This has
been an area I've looked at in great depth recently. I have been EMI testing
a great many PC Cards, and it took me a long while to find a PC that would
comply on it's own. I found only 2 motherboards, both made in the USA, that
could pass with no cover on.
The worst motherboard was close to 35 dB over spec when tested with the
cover off. It was made offshore. The reason this was a problem to the card
makers, is that noisy motherboards use plug in cards and their cables for an
exit point. So, the performance of the card is often disguised.
Back to my point :-).
The MB performance is often swamped by the plug in cards and
interconnections that take place to off the boards... So even if the MB is
quiet, the rest of the PC isn't. However, what leaves the case raely comes
from here anyway, it leaves fom the the leads that leave the case like the
mouse and keyboard...
Cheerz,
Derek N. Walton
Owner, L F Research EMI Design and Test Facility
Poplar Grove,
IL 61065
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