RE: Common Mode or Differential Mode

[Nave, Mark]

Radiation is always (99.999%) due to CM.
Conducted can be either; use LISN Mate or a Current probe.

Mark

-Original Message-
From: rehel...@mmm.com [mailto:rehel...@mmm.com]
Sent: Tuesday, January 04, 2000 2:20 AM
To: emc-p...@majordomo.ieee.org
Subject: Common Mode or Differential Mode





Are there rules of thumb or a quick and dirty means of determining
whether conducted emission noise (or radiated) is common mode or
differential mode?

Thanks and have a great new year.

Bob Heller
3M Company



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RE: CISPR 22 equal to EN55022?

[Nave, Mark]

I'm hardly the EMC attorney, but I believe the way it works
is the technical body generates CISPR 22, and the lawyers
adopt and publish it as EN55022

Mark

-Original Message-
From: Matejic, Mirko [mailto:mmate...@foxboro.com]
Sent: Thursday, July 08, 1999 2:34 PM
To: 'Richard Cass'; 'emc-p...@majordomo.ieee.org'
Subject: RE: CISPR 22 equal to EN55022?



Rich,

I'm not aware of differences. 

Potential for difference exists during transitions, it takes some time 
for EN 55022 to follow Amendments to CISPR 22 or new editions.

Mirko Matejic

 -Original Message-
 From: Richard Cass [SMTP:richard_c...@irisinc.scitex.com]
 Sent: Thursday, July 08, 1999 2:00 PM
 To:   'emc-p...@majordomo.ieee.org'
 Subject:  RE: CISPR 22 equal to EN55022?
 
 
 Surprisingly, I never got an answer on this.  Perhaps many of thought that
 it was so simple that someone was bound to answer.
 For the exorbitant cost of this service you would think that I would get
 better service than this. 
 ;-)
 Rich C.
 
 -Original Message-
 From: Richard Cass [mailto:richard_c...@irisinc.scitex.com]
 Sent: Friday, June 18, 1999 3:55 PM
 To: 'emc-p...@majordomo.ieee.org'
 Subject: CISPR 22 equal to EN55022?
 
 
 
 Neophyte question of the week.
 If a supplier of a product claims compliance to CISPR 22, is this exactly
 equivalent to EN55022 (assuming you have met all the latest amendments)
 for
 the purposes of CE marking?
 
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Radiation from transmission lines

[Nave, Mark]

To add another $0.02 worth...

There are two mechanisms for radiation: transmission line fields, and ground
noise.  The fringing fields from the trace determine the radiation.  Therefore,
the height of the trace above the gnd plane (coupling) determines the radiation
by this mechanism.  The ground noise is the most interesting.  The higher the
voltage drop across ground, the higher the radiation.  The voltage drop is
determined by the mutual inductance between the trace and the gound plane, and
the current through the trace.  Assuming the trace is already as low as
convenient, one would then seek to limit the current.  Terminating the trace in
its characteristic impedance results in (typically) MUCH higher currents than
terminating in the high input impedance of the trace.  Lower current, lower
ground noise.  However, the reflection must be contended with.  Termination at
the source assures only one reflection, an acceptable situation.

Mark

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