Forgot who asked the question but I had suggested that they look in
part 15 under digital device exceptions because of the switch mode supply.
I think they were under 9 Khz switching. Here is a pertinent section
(h) Digital devices in which both the highest
One thing to watch for when applying ferrites is the weight. I had a client
who put a ferrite on an AC power wire inside an ITE product tabletop
enclosure. The ferrite caused the connector to come unplugged and resulted
in exposed AC power wires freely moving about in the unit. Clearly, an EMC
There is a third answer, the standards as written address the problem
sufficiently. The other two could also be valid.
Gary
-Original Message-
From: John Shinn [mailto:john.sh...@sanmina-sci.com]
Sent: Friday, November 22, 2002 10:19 AM
To: 'Jim Bacher';
It was about five years ago, I did an EMC job to meet the CE mark requirement
for a Semiconductor equipment manufacturer by the approach of TCF (Technical
Construction File). The whole system was real giant and there was no way to
bring the system to the lab fitting in the chamber.
Many
I read in !emc-pstc that brian_ku...@leco.com wrote (in
tfscc...@leco.com) about 'ReIssue: RE: When CE doesn't pass' on Fri,
22 Nov 2002:
Thanks to everyone who responded to my earlier email. After reading the
replies, I wanted to rephrase and clarify our situation to see if it matters.
We
I read in !emc-pstc that Gert Gremmen g.grem...@cetest.nl wrote (in
oleokfnbajjejfkplbbmkegjcfaa.g.grem...@cetest.nl) about 'Revised EMCD'
on Fri, 22 Nov 2002:
Hi Bob,
The EMCD is in version 8 now.
The text is final and on its way to approval within EC administration.
I think that is a
Following my previous email, I received some inquires about a complete list of
CCC implementation rules. If you have not heard of the new CCC Mark
requirements and want to learn more, you can visit http://www.siemic.com click
the red China Approvals flag, or enter here at
I had a very good source of pdf ENs at the Swedish Standards Institute
(SIS), then the Swedes had to go and change their web site.
http://www.sisforlag.se/
This site use to be in English and it was clear that certain ENs were also
in English. All they did was attach a national cover page onto
Brian,
Fix it. I said this before, and you expressed some concern about safety. I
wouldn't be afraid about attempting to make changes to see what it might
take to fix the product - you won't know until you try. I personally HATE
having to fix an OEM's problems. Each change would have to
Brian,
I don't think it matters, if you are selling the equipment to your
customers you bear the obligations EMC and everything else. It certainly gives
you the right to eliminate a failing vendor from your qualified vendor list,
but you can't just pass the problem on the
A tricky situation, you have my sympathy.
There are principals involved, and I can imagine that feelings about being let
down by a supplier are also part of the picture.
Sometimes the solution to such situations comes not from the confrontation but
by the back door.
What if your EMC lab were
I assume that you already did this, but your email didn't explicitly say so.
Did you ask D's manufacturer HOW they test it? You may be surprised. I have
knocked myself out trying to get a product to pass testing with an operating
Ethernet port; only to find out that our OEM manufacturer
Hi Bob,
The EMCD is in version 8 now.
The text is final and on its way to approval within EC administration.
Main difference is the additon of creating a report to the essential
requirements.
Until now only properties of the equipment were essential requirement.
Now some form of proof is
I have found a very limited number of e-field probes with optical ports that
are suitable for calibrating a radiated immunity chamber. They are:
* Holaday probe with optical port sold by ETS-Lingren and Amplifier
Research
* Wandel Goltermann probe with Narda optical interface, both
Dear Group,
It's to inform you that China CNCA has revised the CNCA-02C-023 (Rev 2002). The
old revision published in 2001 is replaced by this new revision with effective
from Nov.1, 2002.
All manufacturers applying for CCC under this category shall refer to 2002
version.
It's also
Last time I checked, there were still some EN standards that did not seem
to be available in searchable-PDF form from any source. Try ANSI
http://webstore.ansi.org/ansidocstore/find.asp?
I think ANSI's EN collection is not complete. They do however sell all ISO
and IEC standards, which in many
Bob,
Attached please find current DRAFT of the revised EMC Directive as well as a
report produced as the result of a critical review of the EMC
standardization system by CEN, CENELEC, and ETSI. The Commission was
seeking comments from Industry/Trade Associations and governments. I am
also
All:
There are two answers here. The first is that the level of complaints
is low because many people (the average non-technican citizen) does
not know to whom to complain, or feel that they will not get any
response (and may not). The second issue is that most regulatory
bodies do not do any
Thanks to one and all. A summary of what I've understood by this and other
replies is:
The formula for the Rayleigh criterion is based on solving a right triangle
for the distance to the center of the antenna element as described below by
Dr Turnbull and neglecting a small lambda term in the
Thanks to everyone who responded to my earlier email. After reading the
replies, I wanted to rephrase and clarify our situation to see if it matters.
We design, manufacture, and market stand-a-lone Product A. But some of our
customers want a complete turn-key system. So we purchase and
You can also do that at the IEC webstore.
Ralph McDiarmid, AScT
Member Technical Staff
Engineering Services
Xantrex Technology Inc.
www.xantrex.com
tel: (604) 422 2622
fax: (604) 420 1591
Confidentiality Notice: This email message, including any attachments,
is for the sole use of the
Can someone give me a brief status on the revised EMC Directive? Is it
still alive?
Will it require testing and marking of completed cable assemblies? If so,
does anyone know what test setup is being proposed?
Thanks,
Bob Heller
3M Product Safety, 76-1-01
St. Paul, MN 55107-1208
Tel: 651-
ANNOUNCEMENT
Last chance to receive 15% off of the total purchase of catalogs for orders
placed before 11/30/2002
The China National Certification and Accreditation Administration (CNCA) of
the Peoples Republic of China has published the Implementation Rules for
Compulsory Product
UL 746C Plastic materials or UL 508, industrial Control Equipment are well
recognized enclosure performance standards .
Check www.ul.com
Peter A. Manfredonia
Underwriters Laboratories Inc.
1285 Walt Whitman Road
Melville New York 11747-3081 USA
tel: 631.271.6200 x 22448
fax:631.439.6044
Charles,
As a suggestion you might try a version of the processes from GR-487
Electronic Equipment - a standard written to determine the acceptance of
outdoor equipment.
They have a suite of tests for thermal shock, temperature, and
ultraviolet light.
Try http://standards.risknowlogy.com 50+ titles, most of them digital
-Original Message-
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Jim Purdie
Sent: Thursday, November 21, 2002 7:10 PM
To: 'emc-p...@majordomo.ieee.org'
Jim,
You can buy electronic copies of some EN standards from the ANSI Online
Store, at:
http://webstore.ansi.org/ansidocstore/default.asp
John Barnes KS4GL, SM IEEE
dBi Corporation
Charles,
The IEC60068-XX series of standards should help you.
Allen
Charles Blackham wrote:
All
I'm familiar with HALT/HASS testing of electronics, but now I'm looking to
accelerate the life of the plastic enclosure we put the equipment in. These
units are installed worldwide, outdoors, so
I have not been able to read the Part 87 yet, but if there are any Part
87-experts in this forum, could they just give me a short comment about
which test that applies ? Same tests as in Part 15 ?
Best regards
Amund Westin, Oslo / Norway
---
This
All
I'm familiar with HALT/HASS testing of electronics, but now I'm looking to
accelerate the life of the plastic enclosure we put the equipment in. These
units are installed worldwide, outdoors, so see a variety of conditions in the
field.
We have developed some tests ourselves but I would
Peter,
The complete title for UL783 is Battery Operated Flashlights and Lanterns for
use in hazardous (classified) locations. It's why I understand it has to be
used for intrinsic purposes.
Furthermore, it seems that UL781 would be more applicable to our product.
Regarding the safety for my
The derivation of this formula involves considering a position in front of the
antenna, on the line in the direction of radiation. The distance from this
point to the edge of the antenna will be slightly more than the distance to the
centre. If this distance is a significant fraction of a
Pierre,
UL783 (Battery Operated Flashlights and Lanterns) is not the standard for
intinsic safety. It is the standard used if your head lamp is used in
non-hazradous environments. For intrinsic safety, you must use UL913
(standard for intrinsicaly safe equipment).
Best Regards
This e-mail
Hi Gary and Peter,
When the little switch mode power supply is used, frequencies generated and
used inside the product are less than 9KHz.
Reading your messages, I understand that no EMC or safety standards applied to
the basic products.
Only the product with switch mode power supply could be
Hello Kim,
Approval is required for 2.4GHz SRD in South Africa.
We have successfully obtained approval based on EU EN300 328, safety and emc
test reports (applicable to the product).
You will require a local representative.
If you would like to discuss this off line, my details are below.
HI Kim,
Here's the info I have:
The regulator in South Africa is ICASA (www.icasa.org.za).
2.4 GHz RLAN is regulated in South Africa according to No. 1790 Government
Gazette, 17 Nov. 1995. No license is needed.
The specification to be satisfied is EN 300 328, thus IEEE 802.11b is
accepted. 5
Hi All
We posted a little while back that the European web sites can be found on
our home page. There are two links with some explanatory text as it is a
bit complicated. You could also join the Compliance Club which will keep
you up too date by email(It is FREE) www.compliance-club.com
The usual parameters given with TEM cells are field uniformity and input
impedance (or VSWR). Although they may appear to be very good up to the
declared frequencies of operation, which depend on the transversal size of the
cell, they are only good for empty cells. Presence of any conductor in
Feng Li fen...@cadence.com wrote on 11/22/02 09:55 AM
the power and ground of various voltages and characteristics confused me
a lot
I don't see why? Try some simplified 3D CEM type simulation and view the
surface (or displacement) current patterns and the result of haphazard
violation of the
Dear all:
For a monitor, there are many displaying modes. The related factors are
resolutions (640x350, 640x400, 720x400, 640x480, 800x600, 1024x768, 1152x864,
1280x960,..), refresh rate(56Hz, 60Hz, 72Hz, 75Hz, 85Hz).
If a monitor has most of the displaying modes, how can I find the worst
No - and yes. Conducted emissions limits on power inputs, measured on a
LISN, are based on the conducted susceptibility of radios to in-band
interference. It turns out that limiting CE to these levels also protects
against radiated rfi below 30 MHz. I am not familiar with sub-30 MHz CE
limits
Hi all,
I'm now considering the problems regarding to EMC checks on high speed PCB
designs. Particularly, the power and ground of various voltages and
characteristics confused me a lot. As a common guideline, it is necessary to
check for power/ground planes or shapes overlapping between
Brian Kunde wrote:
Sometimes when we have a system tested for CE (emissions and immunity),
one of the other companies pieces of equipment will cause the system to
fail.
Yes, indeed. Luckily, I worked for a computer manufacturer and we could
find other vendors. Still, I have found it
Isn't that the basis for measuring conducted emissions below 30MHz rather
than radiated, since you reach the limits of practical antenna size?
Jim Eichner, P.Eng.
Regulatory Compliance Manager
Xantrex Technology Inc.
phone: (604) 422-2546
fax: (604) 420-1591
e-mail: jim.eich...@xantrex.com
Has this ever happened to you?
ALL the time...
My opinion:
The system must pass if the equipment in the system tested is what you are
intending to ship.
If the failing component is part of the system you ship, then you should get
it fixed. That's why the labs stock all those free ferrites - so
Cortland, these are good point as I have been guilty of working around such
issues. The couple times I did chase them down, I found one was coming from
the Local Osc. in a scanning radio. Another was a keyboard that was
radiating
and did not have a ferrite on it, but in their FCC report it had
All-
I'd like to know if there are any opinions about...
It is my understanding the CISPR 22 A1:2000 will require the
use of ferrite clamps during RE tests of table-top equipment.
Has anyone started using these devices during their testing?
Group,
Thank you everyone for your replies and pointers.
As usual, your advice has been well informed and most useful.
Best regards
- Chris
-Original Message-
From: Chris Chileshe [SMTP:chris.chile...@ultronics.com]
Sent: Thursday, November 14, 2002 1:00 PM
To: 'Emc-Pstc'
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