Keith,
My two favorite books are "Noise Reduction Techniques in Electronic Systems" by
Henry Ott, and "Controlling Radiated Emissions by Design" by Michel Mardiguian
Regards
Joe Martin
Product Safety/EMC Engineer
"Keith Zell" on 09/15/2000 07:25:31 AM
Please respond to "Keith Zell"
To
Hello all,
In addition to all of the already mentioned reasons not to use a trace as a
fuse, is that the fiberglass resin becomes conductive once it is molten, and a
"China" syndrome meltdown can occur if the circuit energy is sufficient to
maintain the molten state.
Mike Harris/Teccom Co.
After rejecting Sony & HP, I enquired at several labs & got Dell as
preferred for emi host cpu. Dell recommended the MCM. After evaluating 1, we
bought 3 more & have been happy over the last year.
Mike Harris/Teccom
-Original Message-
From: k...@i-data.com
To: emc-p...@majordomo.ieee.or
Doesn't it depend on the purpose of the fuse?
If the circuitry is non-telco and voltages are < 42V you have wide design
latiitude. Even if the agencies do not care, you should characterize the
performance under abnormal conditions. At least one company uses printed
fuses on PC accessory cards t
Hello to all,
IMO, three of the most informative books from a practical intro approach
into the world of EMC are (not in any particular order):
1. Henry W. Ott, "Noise Reduction Techniques in Electronic Systems", John
Wiley and Sons, ISBN 0-471-85068-3,
2. Mark Montrose, "EMC and the Printed Ci
Group:
Can anyone advise what the European equivalent standard to UL 1431,
Personal Hygiene and Health Care Appliances is? The product I have been
questioned about is a cosmetic device (non-medical) that temporarily reduces
the appearance of cellulite using a vacuum process.
Man
There was very good list compiled by Ron Pickard ( ron_pick...@hypercom.com
) on Wed 5/12/99. He gets the credit. Below is his message with attached
word.doc file of the books.
Regards,
Boris Shusterman, EMC Corp.
EMI Compliance Engineering
(508) 435-2075 ext. 77517
To all,
Well, the respon
Hi group,
I am sure that Ken appreciates all the pointers, but no one is answering his
question.
He is asking for a reference to a standard that allows him to do this. If I
knew one I would certainly tell him.
Josh
-Original Message-
From: mr...@ix.netcom.com [mailto:mr...@ix.netcom.com
Hi All,
This is a question regarding systems which use CompactPCI bus architecture.
On a cPCI backplane the PCI clock is routed to every slot on the backplane
with up to 7 peripheral slots possible on a normal backplane. My question is
this: With the cPCI specification calling out specific trace l
Clayton R. Paul, "Introduction to Electromagnetic Compatibility", John Wiley
and Sons, ISBN 0-471-54927-4.
Henry W. Ott, "Noise Reduction Techniques in Electronic Systems", John Wiley
and Sons, ISBN 0-471-85068-3.
- Original Message -
From: Keith Zell
To: emc-p...@ieee.org
Sen
I wanted to throw in an emissions trouble shooting technique that I saw Jon
Curtis do one time when I was at his lab. I'd like to call it the "Jon
Curtis Wet Finger Test"
We had a signal failing at 200Mhz. We had narrowed the problem down to
either the GPIB cable or the GPIB interface circuitbo
Hello Keith,
I've been selling Tim Williams' books for a couple of years and have
received no complaints. The newest one, published this year, is titled,
"EMC for Systems and Installations". Check it out at
where you will find a description of
this book (and others).
Regards, Art Michael
In
Keep in mind the possibility of the trace shorting to dead metal parts
before vaporizing creating a momentary high leakage current.
Bob
E Eszlari wrote:
> Ken,
>From my experience with UL, if a trace opens during a fault test, the first
test you must pass is the hipot, then UL will jump th
One could follow the guidelines in the standard but the alternatives are
sometimes as costly as buying the test equipment that does this
automatically. The alternatives are labor intensive except in the simplest
of products. Look at the web site www.ergonomicsusa.com for test equipment.
They als
Dear all,
I think I sent a virus to you. I'm so sorry that Trojan was sent. I received
it and it re-sent himself to all my contact list. It was not my intention.
It's not the best way to say goodbye to the mailing list. Hope you have not
problems with that.
Regards,
David
-
What training classes and/or books would you recommend for the best
practical EMI/EMC training from a systems approach? I am particularly
interested in grounding/shielding issues and fixes.
Any help would be appreciated.
B. Keith Zell
Electrical Design Engineer
PMI Food Equipment Group
Troy, OH
Hello Joe,
Consider the following -- in the far field (3 or 10 meters), a plane wave is
monitored. In the near field, using either commercial or lab built
near-field probes, either E field or H field emissions will be monitored
separately. The E, H components will be isolated. The emission may
Ken,
From my experience with UL, if a trace opens during a fault test, the first
test you must pass is the hipot, then UL will jump the portion of the trace
that opened and perform the same test. If the trace opens in another
location the same process is repeated (I guess until there is no lo
I might add that the BEST way to do this is to only change one thing at a
time, then retest. It's hard to tell what single change of the multiple
changes attempted actually did the change.
Michael Sundstrom
Nokia Mobile Phones, PCC
EMC Technician
cube 4E : 390B
phone: 972-374-1462
mobile: 817-9
Ken, I would suggest using caution in using a PCB trace as a fuse. The agencies
typically test at what is perceived as worst case, which may not be the right
thing to test a PCB trace fuse with. It will be very important to keep the
power supply return as far away from the fuse as possible. The
Here are my results from test performed 14/9 2000:
PC: Dell Dimension L566CX ; Model MCM
Monitor: Dell 15" Model E770p
FCC and CE approved all components
The PC cabinet is very good, but CD-ROM had to be grounded by EMC/Cu gasket
arround the front. The it was very good with a margin of more tha
FAQ: Sources of EMC & Safety Compliance Information
This is to let you know that I have just posted in two parts the 53rd
issue of the above FAQ to the newsgroup for regulatory/compliance matters
and EMC and safety specifications and testing,
sci.engr.electrical.comp
Hi Joe.
You asked for an explanation as to why the difference between the near and
far field results. I think the replies so far have probably answered that
question. I've tried here to give some help with the real problem of
solving the excess emissions.
From my own experience and discussi
Jeffrey,
Suggest to visit below site for your required information.
http://www.ofta.gov.hk/index_eng.html
Regards,
Raymond Li
Dixons Asia Ltd.
"Collins, Jeffrey" on 14/09/2000 08:44:44 p
Please respond to "Collins, Jeffrey"
To: emc-p...@ieee.o
Thank you all for responding to my inquiry thus far. Here is an update on
my findings. I have since had the opportunity to discuss this issue with a
few different NRTLs in regards to particular standards. The uniform
concensus thus far from these agencies are that they test to standards, not
ne
Low level halogen and Xenon lighting make use of "electronic" transformers.
Does anyone have a typical circuit of one of these transformers?
I attempt to do suppression of devices such as these that generate considerable
broad band noise at broadcast as well as short wave frequencies and need to
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