Re: [SI-LIST] : Conducted noise emission diagnosis device

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From: brent.dewitt@us.datex-ohmeda.com
Date: Fri Apr 21 2000 - 10:03:29 PDT


You're probably referring to the "LISN-Mate" made by EMC Services Inc., which is
basically a differential mode rejection device. You can do the same thing with
any current probe that works in your frequency range of interest. Just cut off
the jacketing on the power cord and run the power and neutral conductors through
the probe in the "normal" direction, then reverse one of the conductors. It
should give you a pretty good idea which mode is dominant.

Best regards,

Brent DeWitt
Datex-Ohmeda
Louisville, CO

keng-kok_khoo@hp.com on 04/20/2000 11:27:30 PM

Please respond to si-list@silab.eng.sun.com

To: si-list@silab.eng.sun.com
cc: (bcc: Brent Dewitt/US/D-O)

Subject: [SI-LIST] : Conducted noise emission diagnosis device

Hi all,

I am looking for a device that will differentiate the dominant component(either
common-mode or differential-mode current) in the total conducted noise emission
current of a product measuring through its' power cord using a LISN.

I called this device "common/differential mode current separator". In conducted
noise emission measurement, both common-mode and differential mode noise
current are measured by LISN and the LISN can't tell which mode is the dominant
current.

I came across a paper by Clayton Paul and Keith Hardin which explain the
usefulness of a separator like this that would identified the dominant current
from the total current. Hence, the correct capacitor value(either X-caps or
Y-caps) can be changed accordingly so to reduce the overall conducted noise.
The book by Clayton Paul "Introduction to Eletromagnetic Compatibility" has
also mention about this device.

I have contacted a few persons trying to look for the person who have actually
built this separator himself and I am also looking for any vendor who have this
product for sale. So far, my effort has yield no results.

Can anybody point me to the right person so that i can try to built this
separator myself. Any other suggestion and comments are greatly appreciated.

Best Wishes,
KHOO KK

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