Hello,
Interesting, looks like you meet the old FCC requireemnts. I think the new
FCC requirements are to the CISPR A and B limits.
Regards,
Ken Hall
-Original Message-
From: Dan Pierce [mailto:dpie...@openglobe.net]
Sent: Thursday, November 07, 2002 1:05 PM
To:
Dan,
From the data provided one cannot make a pass/fail decision. The (old) FCC
limits for power line conducted emissions are based on a quasi-peak
detector. Going over the limit with a peak detector does not necessarily
mean that the product fails as a peak detector quite often will read
Neither of these is the right detector if you interpret them strictly. A
quasi-peak detector (what you are supposed to use to measure against the
limit) has a response in between that of a true peak detector and an average
detector. But a lot of times when they say peak they mean quasi-peak.
Doug,
If I understand your description properly, the AC power cords run from the
power supplies and thence out of the box. This would negate shielding the
box (whose construction, as you describe it, is not encouraging, either)
might offer. It looks to me that as there would be a difference in
...but for an alternative view, Regulation 40 (2) of the UK's The
Electromagnetic Compatibility Regulations 1992 (SI 1992:2372) says:
An EC declaration of conformity to which this regulation applies shall-
(a) be in English;
(b) give the name and address-
(i) of the responsible person;
Forum,
I have been contacted by a headhunter who wants an EMC designer to work a
power supply design (28 Vdc input, so likely mil or aerospace application)
in Clearwater, FL. The job is for several months, full time. I can't leave
my home base for that kind of time. Any one out there
Hey, Doug Smith, this one's for you...
--
From: lisa_cef...@mksinst.com
To: emc-p...@majordomo.ieee.org
Subject: Fixes
Date: Thu, Nov 7, 2002, 1:34 PM
Hi all,
Does anyone know of a source, (web site, book, papers, etc.) which contains
suggestions on how to fix various EMI
I must be missing something. The controlled impedance concept would work
for me if the cable-under-test (CUT) were a single-wire-above-ground (swag)
transmission line terminated at either end in its characteristic impedance.
That is never the case. If a cable is shielded, then it is terminated
Greetings:
I am looking for proof that I can use the averaged value for emissions
rather than the peak value. Attached is a chart that I was given by an Asia
test site that told me I failed. According to my past experience, I believe
that the average power is what I should be concerned about.
Hi Lisa,
There are several excellent books that come to mind:
1. Printed Circuit Board Design Techniques for EMC Compliance,
Mark Montrose, IEEE Press, ISBN-07803-5376-5
2. EMC and the Printed Circuit Board - Design, Theory and Layout Made Simple,
Mark Montrose, IEEE Press, ISBN
I read in !emc-pstc that John Allen john.al...@era.co.uk wrote (in
BFE68AB0084CD311B4FB00508B014C8703CF9CD2@MERCURY) about 'EU DoC -
ATEX Examples' on Thu, 7 Nov 2002:
The EC declaration of conformity and the application of the CE marking may
be effected either by the manufacturer or his
Anyone have any fresh ideas on how to improve
the overall chassis ground integrity of a hot box?
Let me explain - standard off the shelf box, about 4U
high, with 2 redundant AC power supplies. Bottom
and sides are one piece folded up, top cover is screwed
down. Primary ground comes through
Hi all,
Does anyone know of a source, (web site, book, papers, etc.) which contains
suggestions on how to fix various EMI problems?
Thank you in advance.
Regards,
Lisa
---
This message is from the IEEE EMC Society Product Safety
Technical Committee
Hi Folks
Whilst investigating something else today, I came upon the Commission
Guidance Notes for the implementation of the ATEX Directive :
http://europa.eu.int/comm/enterprise/atex/guide/guide_en.pdf
On Page 112 in reply to Question 13 (about something else), Case 1, 2nd
paragraph, states
Sorry, I should have made it clearer that the two lines needed to be made into
one URL.
Access to both ROHS and WEEE can be obtained by using the alternative URL and
the process as follows:
www.EurActiv.com
Enter ROHS in the search box. This will bring up a list indicating both ROHS
and
Hi Nick,
I originally posted this question under the Title 95/54/EC Automotive
Directive Conflict. It is archived under October 2002.
Kind Regards
Alex McNeil
Principal Engineer
Tel: +44 (0)131 479 8375
Fax: +44 (0)131 479 8321
email: alex.mcn...@ingenicofortronic.com
-Original
Could this be the Statutory Term of presumption of conformity of superseded
standard?
Of course I jest!
I tried to take the easy way out by splitting up the word and effectively
changing the short form to a phrase Doc of POCOSS but then realised
that was all wrong and intuitively means
A short while ago someone posted some interesting questions about the
Automotive EMC directive which alluded to a difference of opinion
between the UK and French interpretations of the directives as
regards household/commercial products being used temporarily in a
vehicle.
This has
All
I agree with John.
This business is full of acronyms and numbers. Any means of clearing the
fog is beneficial to the group as a whole. It would be useful if we had a
list of accepted acronyms and their meanings: such as MRU, BTW, AFAIK, NB,
ESD, CB, CBO, DOC, DOCOPOCOSS, EFT, AIUI and many
All
The following website gives a dissection of uncertainties in immunity
testing including EN61000-4-6 and there will be a meeting at NPL later this
month.
http://www.elmac.co.uk/
Thanks
Ian Gordon
-Original Message-
From: Ken Javor [mailto:ken.ja...@emccompliance.com]
Sent: 07
For those interested in the complete details of banned substances,
Article 4 of the ROHS Directive states:-
Member states shall ensure that, from 1 July 2006, new electrical and
electronic equipment put on the market does not contain lead, mercury,
cadmium, hexavalent chromium, polybrominated
I have to agree with Mr. Woodgate's comment, as far as numbers go - 150 Ohms
means the wire is very close to a well-defined ground plane if the number
represents a transmission line characteristic impedance. However, the IEC
1000-4-6 test set up does not represent the real world, because it
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