Be careful. IBM (perhaps Lexmark now) holds a patent on certain aspects of
this technology.
Richard Woods
----------
From: Binnom, Cyril A [SMTP:binno...@ems-t.com]
Sent: Friday, June 15, 2001 10:07 AM
To: emc-pstc
Cc: McBride, James; Wismer, Sam; Massey, Doug C.; Davis, Brett A.
Group,
I am experiencing a EMI failure during testing and it has been
isolated to
the processor board in which the fundamental frequency is 66.6 MHz
the 3rd
harmonic that is our failure frequency is 199.8 MHz. We consulted
the
manufacturer of the board and they have come up with a "spectrum
spreading"
application for me to try. As I understand it, these type of
applications
work by essentially jittering the clock frequency in order to spread
the
energy over a wider band of frequencies. Thus the level at any
particular
frequency is reduced even though the overall amount of energy
radiated is
the same. The file they are sending me is a test application. If it
works
well enough to get the unit to pass test, they have the ability to
enable
the same application in the BIOS so it is always running.
Does anyone have any experience using this type of application? Any
opinions
on its validity? To those that can attest to its validity, any pros
or cons
to the use of this application?
Regards,
Cyril A. Binnom Jr.
EMI/EMC Approvals Engineer
LXE, Inc.
(770) 447-4224 Ext. 3240
(770) 447-6928 Fax
binno...@lxe.com
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