Dear Muriel,
The "Differential- or Common-mode Box" design is in the IEEE Transactions on
EMC, Vol. 30, No.4,
November 1988, pages 553-560. Figure 2 shows the schematic and Figure 3 has an
inside picture.
The box is very easy to make. It is made from two transformers, two resistors,
and a switch. The
picture has enough detail that one can see that it matches the schematic. The
VARI-L transformer
LF428 may have to be back ordered and you have to buy a minimum of 5 parts. We
still use the
one in the picture.
If you do not want to make your own, Pointsix is a company that has made some in
the past.
You could try them at www.pointsix.com. I have a call into them to see if they
still make it. They
are based here in Lexington, Kentucky. I'll let you know what I find out.
Please let me know if you have any more questions.
Regards,
Keith Hardin
Senior Technical Staff Member
Lexmark International Inc.
"Muriel Bittencourt de Liz" <muriel%eel.ufsc...@interlock.lexmark.com> on
02/04/2002 10:37:35 PM
Please respond to "Muriel Bittencourt de Liz"
<muriel%eel.ufsc...@interlock.lexmark.com>
To: "EMC-PSTC" <emc-pstc%ieee....@interlock.lexmark.com>
cc: (bcc: Keith Hardin/Lex/Lexmark)
Subject: Conducted noise emission diagnosis device
Hello Group,
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.
This device can be called "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 Regards,
**************************************************************
Muriel Bittencourt de Liz
Ph.D. Student
Federal University at Santa Catarina
Florianópolis, SC
Brazil
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