[SI-LIST] noise/emi getting into signal measurements

From: Doug Smith <doug@xxxxxxxxxx>
To: SI-List <si-list@xxxxxxxxxxxxx>
Date: Sat, 18 Nov 2006 08:00:39 -0800

Hi Everyone,

I am a little late getting my monthly article out because of a heavy 
travel schedule (in Oxford, England at the moment). My latest 
"Technical Tidbit" is:

Measuring Signals in the Presence of Severe EMI - Part 1, How Not to Do It

Abstract: A popular engineering troubleshooting technique is to 
measure power to ground noise on a board or in a system, often with a 
differential measurement using two unbalanced probes and channel 
subtraction in the scope. Such measurements at today's speeds are 
generally unreliable. Data is presented to illustrate limitations of 
this type of measurement.

The picture of the scope probes and metal plate at the bottom of my 
homage ( http://www.dsmith.org ) links to the article.

Have a good month!

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
  \ _ /    ]    \ _ /          Web:     http://www.dsmith.org
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[SI-LIST] noise/emi getting into signal measurements

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