[SI-LIST] Measuring and interpreting the relative phase of common mode currents
- From: Doug Smith <doug@xxxxxxxxxx>
- To: SI-List <si-list@xxxxxxxxxxxxx>, emc-pstc <emc-pstc@xxxxxxxx>
- Date: Sat, 01 Mar 2008 19:30:44 -0800
Hi All,
I have been busy writing again and have the March 2008 Technical Tidbit
ready. The link to the article is the picture with two current probes at the
bottom of the page at http://emcesd.com[1] . This technique should be
applicable to a wide range of system cables from LVDS cables (one of my
favorite of late) to more mundane cables like power, mouse, and keyboard
cables.
Technical Tidbit - March 2008
Measuring and Interpreting the Relative Phase of Common Mode Currents
(an EMC emissions troubleshooting technique)
This month's Technical Tidbit discuses how to measure the relative phase of
two common mode currents with a spectrum analyzer and how to interpret the
results to help fix EMC problems.
Abstract: Common mode currents have long been used to predict emissions from
cables. However, the relative phase between common mode currents on two
cables can yield useful information for troubleshooting EMC problems. A
simple method for determining the relative phase between two common mode
currents using a spectrum analyzer is given along with an example.
Doug
-- ------------------------------------------------------- ___ _ 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[2] \ _ / ] \ _ / Website: http://www.dsmith.org[3]
-------------------------------------------------------
--- Links ---
1 http://emcesd.com
2 mailto:doug@xxxxxxxxxx
3 http://www.dsmith.org
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