It is interesting, nonetheless, to note that the disaster occurred in July
1967, and in September of that year, MIL-E-6051C, EMC Requirements, Systems,
was updated to the D revision, which for the first time required 20 dB
safety margin demonstrations for EEDs. Coincidence? Perhaps...
Ken Javor
Hi Forum
I can recall back in November 2000 there was some discussions here in
this group on how to fight speeding tickets and many of you had good
advices.
I'm about to start on a project which includes calibrating and repairing
police radar guns. This will probably involve setting up a
Derek wrote:
the EUT should have been exposed to simulated shipping and installation
by a user...
FWIW, in the 1980's I worked in an audit lab where we tested samples of
shipped equipment for FCC, vibration, heat, humidity, temperature,
TEMPEST... it was not uncommon for equipment to do
Sir
I must concur with Mr Woodgate. This particular instance in (very) infamous in
the U.S. Navy USMC, but mostly for shipboard fire-fighting instruction and
damage control protocol. The flight-deck videos of this are still shown to
students of the fire-fighting school for carrier crew.
The
CEM = Computation ElectroMagnetics.
There are a number of us around using CEM for EMC design and anyalysis
where appropriate. The ACES group (Applied Computation Electromagnetics
Society) have a session dedicated to EMC at their annual conference in
Monterey, CA. (It's next week - if you hurry
Hi,
Yes it is required for some of the directives. For the MDD, the requirement
is in Article 14, paragraph 2. For the IVDD it is in Article 10, paragraph
3.
If you should have any questions or comments, please feel free to contact
me.
Sincerely,
Ned Devine
Entela, Inc.
3033 Madison Ave. SE
Robert,
I figured 5 kV/m for a distance of 100 meters, over ground. Using commonly
available lab items (and a 100 kV power supply) I should be able to generate 5
kV/m at 3 meters during a 1 ns pulse width. Wonder what this would do to a
cell phone?
Dave Cuthbert
Micron Technology
From:
In a message dated 3/27/2003 8:34:58 AM Central Standard Time,
rsto...@lucent.com writes:
Mark mentioned reports,
a paper trail...or is it?
Vendors doing the EMC/EMI ?,
who might a vendor be for say IBM or Dell?
would think the mfr'r would have an associate
there during testing like most of
I should reiterate from my original message that the text I posted is the
introduction to an article, not a complete article.
The example was included to engage the reader from the start; demonstrate
that electromagnetic compatibility between systems is a real-world issue;
and show that a lack
Anyone know if there is a size requirement for this symbol?
i.e. not less than a certain height as applies to the CE mark which must
be at least 5mm tall.
Regards,
Chris
___
Chris James
Engineering Services Manager
If you are going to claim compliance to EN50385, you will have to make the
assessment according to the standard. Otherwise, you have the following
choices:
Claim safety conformity to the procedures of the RTTE Directive and create a
Technical Construction File and consult with a Notified Body as
Alex, we used a standard camera with a good zoom with remote control,
mounted it to the ceiling in the upper corner of the room behind the antenna
with the wires running out a small hole and covered it in a screened
enclosure. Before we did that we verified that the enclosure did not perturb
the
I read in !emc-pstc that Adrian F Davies davies...@virgin.net wrote
(in dbegllgahbjcdoanbfjbgegccdaa.davies...@virgin.net) about 'OK,
what's going on?' on Thu, 27 Mar 2003:
this is not quite the case in the UK.
EMC issues are policed by local Trading Standards Officers.
There have been several
All
I'm attempting to demonstrate the compliance of our fixed wireless access
system with the human exposure to EMF requirements of Article 3.1a of the
RTTE directive:
The applicable standard, EN50385, requires the field strengths to be
measured/calculated according to EN50383 against the
Derek,
While I have never seen the extent of failure (amplitude) you're talking
about I have run into a tower or two that didn't comply. It was some few dB
out hither and yon. (The monitor was the next biggest concern but I had few
troubles with those, although Gateway went through a bad
Hi Gary,
The definitive list of what requires the compulsory certification in China
is based on a list of Harmonized System (HS) codes issued by CNCA. HS codes
are internationally harmonized commodity codes. I've only seen the full
list in Chinese, but on it commodity descriptions like those
I read in !emc-pstc that Garnier, David S (MED)
david.garn...@med.ge.com wrote (in D4DBD8568F05D511A1C20002A55C008CA2
d...@uswaumsx03medge.med.ge.com) about 'OK, what's going on?' on Wed,
26 Mar 2003:
I discovered the our product's
worst conducted emissions occured when our product was off
and
Dear group members, I would appreciate if anyone can shed some light on the
following:
What would be the MINIMUM LEGAL Safety and EMC requirements (i.e. tests,
reports, certifications, labeling) in the following two scenarios?
1) A company designs printed circuit boards that are used by
It is always a good idea to have a copy of the standard.
If it is DC/DC converter, you might find some of the footnotes in
the generic immunity standards such as EN 61000-6-2 useful.
Example [paraphrased]:
Apparatus with a d.c. power input port intended for use with an
ac-dc power adaptor
All,
There will be a Northeast Product Safety Society meeting on Wednesday,
March 26th, at EMC Corporation's Customer Briefing Center at 42 South
Street in Hopkinton, MA. A social hour with light refreshments will
begin at 7:00 PM and the technical meeting will start at 7:30 PM. There
will be
I read in !emc-pstc that King, Richard richard.k...@uk.thalesgroup.com
wrote (in C02943801230D611919D00508BDF0C246EB61A@RTWEXCH) about 'Help
wanted with succinct subject description for non-specialists' on
Thu, 27 Mar 2003:
In 1967 off the coast of Vietnam, a jet landing on the aircraft
Hi all,
This e-mail has been prompted because of a number of things that have all come
together. This may take a little reading, but please stick with it.
Last note... this is not intended to pick on any individuals, or organization,
but I do want to stir the pot.
I operate an engineering lab,
... BB conducted emissions from a battery charger...
The last product that I cert'ed was a PC based product,
its ATX supply was a special model which contained a UPS.
During product certification I discovered the our product's
worst conducted emissions occured when our product was off
and
Good morning all,
this is not quite the case in the UK.
EMC issues are policed by local Trading Standards Officers.
There have been several successful prosecutions in the South Wales area.
Experience has shown that a CE marked CPU unit will be close to the limit.
However, plug another CE
I use NEC-2 in a limited way.
Good to hear that there are others on the PSTC list that does that. :-)
BTW, are there any guys out there that work with CEM?
Tim Foo
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site
-Original Message-
From: King, Richard [mailto:richard.k...@uk.thalesgroup.com]
Sent: Monday, March 24, 2003 3:07 AM
To: 'emc-p...@majordomo.ieee.org'
Subject: Help wanted with succinct subject description for
non-specialists
Dear all,
I am working on an article about EMC for an
Hi Forum,
I have a EN61000-4-3 compliance test set up in a Chamber. Some of our
products have LCD displays 2cm X 8cm. My problem is I bought a Teseo RF
proofed camera that cannot zoom in on the display at a distance of 2m (from
the corner of the chamber). I can obviously see the display if I
Dear All,
Many thanks for your collective help with this question. I attach my final
text below in case others on the list have a use for it.
Electromagnetic Compatibility (EMC)
In 1967 off the coast of Vietnam, a jet landing on the aircraft carrier
U.S.S. Forrestal was briefly illuminated by
Amen!
I had 15 years of computer EMC when I left the PC sector this year. This was
a never ending source of frustration.
I won't even get into the shortcomings of the measurement standards.
The emigration of PC manufacturing to the PAC rim is being followed by
emigration of the design and
Derek,
doesnt say whether you took the
uncompliant equipment straight from your
lab to another without making any changes...
be interesting to see what the data is,
since PC's are listed to class B...
you may have something..
but its always good to get a second
result from lab B.
Richard,
I am sure you also addressed this but since I have 2 cents to add...
A front-end overload condition on the receiver/analyzer, or an overload at
the pre-amplifier, can cause errors in measurement that may seem
transparent. A local transmitter could be overloading your measurement
system and
To me, all this regulation can be synopsized:
Electronics shall not put out stuff - conducted or radiated
Electronics shall not be upset when stuff comes in -
susceptibility to conducted or radiated.
Difference in attitude between US and elsewhere:
It is my understanding that in the US
EMC Technician looking for work. I have 5+ years of experience with FCC,
CISPR and Belcore. Currently living in MN. Willing to relocate.
_
Do you Yahoo!?
Yahoo! Platinum http://rd.yahoo.com/pl
tinum/evt=8162/*http://platinum.yahoo.com/splash.html - Watch CBS' NCAA
March Madness,
Gary, All,
Office networking equipment (ethernet/network hubs, switches,
Ethernet PCI Cards, etc) are included in the definition.
I attended a US Dept. of Commerce seminar with a delegation from the
CNCA and that was one of the questions raised and answered - so it's
strainght out of the
Richard asks..
My questions to the list are: What are your experiences of
producing similar material? How well was it received and what
is your advice for people producing similar text?
Always a difficult (but absolutely essential) task I find. You may
have to stand in front of the audience
If you have a Power supply unit tested according to IEC60950 (1992) 2nd
edition, will it fulfil UL 1950 3rd ed ?
In other words, is IEC60950 (1992) 2nd edition still valid for UL approval
?
Amund
Oslo / Norway
This message is from the IEEE EMC Society Product Safety
Technical Committee
Hi Group,
do you know if any specs or standards exist for Hi-Pot testing on circuit
packs (boards)?
Let's say the boards have -48VDC input, than DC-DC converters, no TNV
circuits, intended to be installed in Central Office as part of the bigger
system (chassis).
I know we suppose to do Hi-Pot
For non-technical people ... in other words KISS.
EMC is two things:
I respectfully disagree.
Here's what I'd say.
Take it as you wish.
EMC or Electromagnetic Compatibility is the products ability to
pass a variety of electromagnetic product testing requirements
demanded by different countries
In a message dated 3/25/2003 4:11:56 PM Central Standard Time,
drcuthb...@micron.com writes:
most interesting data. I have two questions: What software are you exercising
the PC's with and is the spread spectrum enabled? I assume you are using an
RBW of 120 kHz and using Quasi-peak detection.
Hi Alex,
talk to Sensormatic, the are in Florida, but great folks to deal with.
Don Umbdenstock would be the chap.
djumbdenst...@tycoint.com
They have a remarkable camera that can sit in the roof and zoom quite hi.
While I was at his lab, I didn't see it respond to fields up to 10 v/m. The
I support contacting the FCC to look into it. Provide supporting documentation.
Otherwise we're all wasting our time and money making striving for compliant
product.
This is my personal opinion, which may not necessarily reflect that of my
employer.
John A. Juhasz
GE Interlogix
Fiber
Derrick,
I'm sure you used the antenna factors correctly but I'll put in my 2 cents
worth anyway. Were the AF's used correctly? You need the TX AF and the RX AF.
If the receive antenna factor was used as the transmit antenna factor that
will skew the calibration.
Dave Cuthbert
This message
I read in !emc-pstc that David Heald davehe...@attbi.com wrote (in
3e826b48.8060...@attbi.com) about 'Fwd: requirements for lab use
(primarily) equipment' on Wed, 26 Mar 2003:
Forwarded for Neven Pischl... Please respond to Neven (cc'ed on this
message).
- Dave
I already replied to this
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