[SI-LIST] Re: Chassis and Signal ground
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "Peterson, James F (FL51)" <james.f.peterson@xxxxxxxxxxxxx>, si-list@xxxxxxxxxxxxx
- Date: Wed, 15 Dec 2004 08:46:45 -0800
If I connected them at all, and I usually don't, it would be in only one
place, so that the opportunity for inceased EMI is held to a minimum.
Lee W. Ritchey
Speeding Edge
P. O. Box 2194
Glen Ellen, CA 95442
Phone- 707-568-3983
FAX- 707-568-3504
I just used the energy it took to be angry to write some blues.
Count Basie
> [Original Message]
> From: Peterson, James F (FL51) <james.f.peterson@xxxxxxxxxxxxx>
> To: <si-list@xxxxxxxxxxxxx>
> Date: 12/15/2004 8:26:04 AM
> 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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