[SI-LIST] Re: Chassis and Signal ground
- From: "Grasso, Charles" <Charles.Grasso@xxxxxxxxxxxx>
- To: "'james.f.peterson@xxxxxxxxxxxxx'" <james.f.peterson@xxxxxxxxxxxxx>, "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 15 Dec 2004 15:45:52 -0700
Be very careful here. I suggest you contact a EMC consultant
to review the overall design.
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: Peterson, James F (FL51) [mailto:james.f.peterson@xxxxxxxxxxxxx]
Sent: Wednesday, December 15, 2004 9:16 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Chassis and Signal ground
Chassis and Signal ground, what happens to our noise susceptibility if we
connect them together on our cards (some of them are analog cards)?
We've always kept chassis ground and signal ground separate on our cards and
connected them together on our backplanes. The reason we even have a chassis
ground on a board is because we use them as thermal layers that are used to
remove heat from boards (that need to operate in the vacuum of space).
We are currently evaluating connecting our signal ground on the boards to
the "card guides" of the chassis. The benefit is we don't need thermal
layers anymore. The signal ground layers can now conduct the heat out
through the guides and onto the chassis....but what have we done to our
radiated noise levels and to our susceptibility to incoming noise?
Regards,
Jim
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