About 30 years ago, I read a book entitled "The True Believer" by Eric
Hoffer, I think. In it he stated that revolutionaries often bring
beneficial changes to mankind, but seldom reap the benefits themselves.
Over the years I have found this to be true. However, I would certainly
encourage anyone who wants to straighten this problem out to go for it.
-----Original Message-----
From: Grasso, Charles (Chaz) [SMTP:[email protected]]
Sent: Friday, March 05, 1999 10:01 AM
To: 'Nathan Belsher'; [email protected];
[email protected]
Subject: RE: Seeking PCs that Pass CISPR
I am confused. What's the problem?
If we (the EMC Community) have faith in
Plug & Play (as the new FCC process is dubbed) then you
should be able to buy ANY FCC logoed PC and pass.
-----Original Message-----
From: Nathan Belsher [mailto:[email protected]]
Sent: Friday, March 05, 1999 6:45 AM
To: [email protected]; [email protected]
Subject: RE: Seeking PCs that Pass CISPR
Eric,
I understand your dilemma. Having been on both sides of the fence
of this
issue I must say it can be a sticky issue. At the very least it can
be very
time consuming testing various machines to get a quiet one. Here is
my
current
experience and my recommendation from past experience.
I have just recently finished another round of testing for FCC,
CISPR,
BELLCORE, and EN50082-1 on a system that has gone through this
testing several times as I do my work on ASDL modems. I have had
better
than
4 dbuv margin on my DELL OPTIPLEX GXPRO 200 MHz. Pentium PRO. Only
the usual
problem of having to reseat the cover has ever been a problem for
us.
I read Randy Flinders comments and he has some merit. Randy has had
a lot
of
pc testing himself on the West coast.
Here is my recommendation for power users such as yourself. Call up
the EMC
department at your friendly PC manufacturer. Tell them you buy
several
systems a year for EMC testing. Ask for their current recommendation
of a
system to meet your requirements. Ask them if they will do a
courtesy audit
of the system you buy before you get it and verify it meets the
required
standards particularly
radiated emissions. You can place the order through regular sales
channels
and
have it shipped to the EMC engineering department where they test it
as an
audit test and then ship it on to you with the complimentary data
package.
This may
add about one month to your procurement cycle but it gets positive
results.
This is the only way I know to be sure you get an EMC compliant
system.
Nathan Belsher
NORTEL NETWORKS
Senior EMC Engineer
Phone: (919)-991-2769 ESN:351-2769
FAX: (919)-991-8724
E-Mail: [email protected]
-----Original Message-----
From: [email protected]
[SMTP:[email protected]]
Sent: Wednesday, March 03, 1999 6:11 PM
To: [email protected]
Subject: Seeking PCs that Pass CISPR
Colleagues,
My (formerly) preferred vendor of Intel based personal
computer
systems,
used for CISPR-11/22 and immunity testing of our boards and
peripherals,
are lately having emissions up to the Class A limit fresh
out of the
box -
without any peripherals attached. So I must query the List
Members
for
experience-based suggestions for make and model of a passing
system
that I
can buy here in the USA.
I need Pentium II equivalent PCI/ISA systems that pass Class
A with
at
least 4 dB of margin and endure EN 50082-1:1992 testing on a
weekly
basis
for most of a year. Systems that can pass EN 50082-1:1998
(or EN
61326-1:1998) would be nice but I suspect few, if any, are
available. We
buy about 4 new machines each year as they wear out.
Please don't suggest that I complain to the PC vendor since
I really
don't
have time to spend on the matter. I've already traded our
newest PC
to
another department that doesn't care about EMC in exchange
for an
older
compliant PC. I just need a long-term solution.
Most importantly, please send your recommendations direct to
me to
minimize
clutter on the list. Unless you specify not to, I'll post a
summary
of all
comments to the list since I believe others are equally
interested
in the
results.
Regards and Thanks In Advance,
Eric Lifsey
Compliance Engineer/Manager
National Instruments
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