Electromagnetic Compatibility Society - 7:00PM, Wednesday, 5 March
Frequency Domain Power Distribution Measurements
Istvan Novak, Senior Staff Engineer, SUN Microsystems, Inc.
In today's advanced digital systems, the power-distribution networks often
have to deliver hundreds of watts at low
Dear All
But it must be understood for equipment that is intended to be left on all the
time, the fact that you have switch on transients is not relevant..
So if the argument is, well what happens in a power cut ?
1. This is not an EMC problem, hence can not be controlled by the EMC
John,
I ran across this website after I had already asked the question. I
particularly like the last label on this page.
http://www.safetylabel.com/catalogs/vie
.php?page=2catalog=1category=16nextpage=Next+Page+%3E%3E
Thanks,
Josh
In particular, the sharp object labels on the following
I read in !emc-pstc that ssel...@yorkemc.co.uk wrote (in
e18ohm0-000bwv...@anchor-post-31.mail.demon.net) about 'dmax test' on
Fri, 28 Feb 2003:
I agree that switch-on is the most likely culprit in a EMC sense, and that
the
cooling of mitigation devices (thermistors etc) is important. I was
I agree that switch-on is the most likely culprit in a EMC sense, and that
the cooling of mitigation devices (thermistors etc) is important. I was
merely pointing out that the standard specifically states: switch off the
EUT before the end of the 1 min measuring time intervalI suppose
Josh
I had a similar enquiry a few months ago, and came to very much the same
conclusions as the other people who have replied to you, but found that
there is a way around the problem because the international standards on
hazards labelling are only prescriptive as regards the styles and colours
Brian,
If you're talking about the EMC Directive, the following link should provide
you with guidance.
http://europa.eu.int/comm/enterprise/electr_equipment/emc/guides/chapsev.htm
Here's a more general link that could provide you with information.
Ian
Yes, the products should have been re-tested and a new D of C raised to
reflect this.
Depending on what they are you may find that there is now a product standard
which relates to specifically that product group. In that case you should
apply this and not the generic standards i.e. 50082-1
Here is a link to my latest EDN Design Idea article (Transmission line tests
1-kW device using only 100W): http://ww
.e-insite.net/ednmag/index.asp?layout=a
ticlestt=000articleid=CA276211pubdate=2%2F20%2F2003spacedesc=designideas
Dave Cuthbert
Micron Technology
This
Annex B of EN61000-3-3 says that both the switch on and switch
off events should occur during each of the 1 minute tests.
Steve Seller
York EMC Services
On 25 Feb 03, at 9:26, djumbdenst...@tycoint.com wrote:
We have a HP HFTS (harmonic and flicker test system) 6843A that runs the
Hi Forum,
I have had one kind gentleman offer his advice on this topic. I would be
very grateful if a few other knowledgable people could offer a comment. I
will summarize the comments for those who answer me direct.
Sorry to have troubled you again.
Previously, production assembly line testing
I read in !emc-pstc that McBurney, Ian [Allen Heath UK]
ian.mcbur...@allen-heath.com wrote (in BC4E3DA2E1C8164D9CBE2DF1595DCC
76011...@gandalf.allen-heath.com) about 'Superseded standard' on Thu,
27 Feb 2003:
Can anyone tell me when products tested to EN 50082-1:1992 and still in
Hello all,
Talk to your board fab shop or get your hands on a copy of IPC-4101A
Specification for Base Materials for Rigid and Multilayer Printed Boards.
It contains detailed spec sheets for about 100 different laminates with
different UL flammability ratings.
FR4 is usually either IPC-4101/21
Or just re-test now to 61000-6-1.
Luke Turnbull
Colgan, Chris chris.col...@tagmclaren.com 02/27/03 12:52pm
EN50082-1:1992 was withdrawn on 1 July 2001. Products tested to that
standard should have been re-tested to the :1997 version which will in turn
be withdrawn on 1 July 2004 and
Dear All,
Most boards are UL rated 105deg C and 130 deg C. These ratings may be based on
a generic temperature index based on the laminate generic temperature index
rating, also assigned by UL.
I would like to find out the overall conecensus rating of a board that is
using FR4 laminate material
Makes sense to me, but we are not shipping to a customer on this side of the
pond...
So the consensus is, that I write the power supply's D of C to conform to the
LVD, and cite EN 60601-1 (the standard referenced in the unit's agency
certifications and CB Report).
thanks much,
Brian
Would
I read in !emc-pstc that Brian Epstein brian.epst...@veeco.com wrote
(in 41c71af75675d54bb97c2fadcae7f994260...@exchange.di.com) about
'refurbished products' on Thu, 27 Feb 2003:
If a customer in the European Economic Area who purchased a product
before
CE marking was required returns
Hi all,
I am looking for the symbol for sharp objects. So far I have had little
success in finding it. I have an out of date edition of IEC 417 in my office
but I don't see it in there. Can someone point me in the right direction.
Thanks in advance for your help.
Regards,
Josh
Josh
Sirs;
Can anyone tell me when products tested to EN 50082-1:1992 and still in
production should have been retested because the 1992 standard has now been
superseded.
I assume any reports and declaration of conformity documents issued for
products declaring conformity with EN 50082-1:1992 are now
EN 50082-1:1992 was superseded by EN 50082-1:1997 on July 1, 2001.
EN 50082-1:1997 will be superseded by EN 61000-6-1:2001 on July 1, 2004.
Bob Heller
3M EMC Laboratory, 76-1-01
St. Paul, MN 55107-1208
Tel: 651- 778-6336
Fax: 651-778-6252
EN50082-1:1992 was withdrawn on 1 July 2001. Products tested to that
standard should have been re-tested to the :1997 version which will in turn
be withdrawn on 1 July 2004 and superceded by EN61000-6-1:2001.
You are correct that any DoCs referring to EN50082-1:1992 are not valid.
Regards
Good point, Steve. Minor adjustment in the procedure takes care of it.
Thanks for the comment.
Regards,
Don Umbdenstock
Sensormatic
--
From: ssel...@yorkemc.co.uk[SMTP:ssel...@yorkemc.co.uk]
Reply To: ssel...@yorkemc.co.uk
Sent: Thursday, February 27, 2003
If a customer in the European Economic Area who purchased a product before CE
marking was required returns that product to the manufacturer to be
refurbished, is that manufacturer required to make all modifications necessary
to CE mark that product before returning it to the customer?
Thanks in
I read in !emc-pstc that Joshua Wiseman jwise...@printronix.com wrote
(in f503cb4657afd4119b9400508bb0d6540695c...@irvmail.printronix.com)
about 'Sharp Object' on Thu, 27 Feb 2003:
I am looking for the symbol for sharp objects. So far I have had little
success
in finding it. I have an out
EN 50082-1:1992 was supperseded by the 1997 version on 1 July 2001; and
therefore no longer provides for the persumption of conformity to the EMC
Directive after that date. If you wish to continue to use harmonized standards
as the basis of conformity, you will have to use current standards. And
I read in !emc-pstc that ssel...@yorkemc.co.uk wrote (in E18oS6s-
000baf...@anchor-post-31.mail.demon.net) about 'dmax test' on Thu, 27
Feb 2003:
Annex B of EN61000-3-3 says that both the switch on and switch
off events should occur during each of the 1 minute tests.
It's a good idea to
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