FreeLists / si-list / [SI-LIST] Isolating pwb and chassis grounds

[Doug Smith <doug@xxxxxxxxxx>]

Hi All,

My latest "Technical Tidbit" article is on board-chassis "grounding." 
This one is sure to stimulate a lot of discussion. The article is 
based on a trend I see in some industries that is causing a lot of 
trouble for designers (and work for me!).

Abstract: System designers sometimes try to achieve a single point of 
connection between circuit ground on printed wiring boards (PWBs) and 
the metal chassis of a system for a variety of reasons. Trying to 
isolate grounds in this way can cause significant immunity problems to 
stimuli like ESD and RF fields. Single and multiple point grounding 
arrangements will be discussed.

This month's Technical Tidbit discusses methods of connecting circuit 
board  "grounds" to chassis "ground." Sometimes a "single point 
ground" causes the very problems it was intended to prevent. An 
analysis is presented of connecting board to chassis grounds in 
electronic systems.

The link to the article is the drawing at the bottom of the page of a 
board grounding setup at http://emcesd.com . You might want to slowly 
scroll down the page because there is a LOT of information on the 
site, over 100 articles and presentations now.

Doug

-- 
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     ___          _       Doug Smith
      \          / )      P.O. Box 1457
       =========          Los Gatos, CA 95031-1457
    _ / \     / \ _       TEL/FAX: 408-356-4186/358-3799
  /  /\  \ ] /  /\  \     Mobile:  408-858-4528
|  q-----( )  |  o  |    Email:   doug@xxxxxxxxxx
  \ _ /    ]    \ _ /     Website: http://www.dsmith.org
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