Darrell, one can only guess whether it is necessary to fill unused ground area.
You haven't supplied enough information to tell. If the ground is a reference
ground plane for establishing impedance anywhere then you must fill the plane.
If thermal considerations exist then fill it. If current
Nick,
I have worked with the SEMI safety guidelines development committee for many
years, and also with CE-Marking compliance...
Generally speaking, there is no correlation between SEMI standards and EN
Standards. That is to say, typically end users request line-by-line
assessment of products
Andrew:
One could theorize that the better growth had nothing to do with RF, but
with the tower not competing with the surrounding trees for nutrients. Did
New Scientist make any cause and effect comments?
I wonder what the EMC-PSTC group thinks of this issue - should there be
concern for
Chet,
You might want to look in UL Safety Standard 508 starting with Part 1 Paragraph
6. This standards requires some very aggressive mechanical tests for
enclosures.
Ron Baugh
VeriFone, Inc.
-Original Message-
From: Summers, Chet [SMTP:csumm...@pelco.com]
The following represents my thoughts on the matter. For the original query,
and those looking for information on actual standards/recommendations on the
original subject matter, there is none to be found in the answer below.
Since I am self-employed, I need not concern myself with embarrassing
Hello group,
I am looking for a standard (or standards) that rates the repeated impact or
detent withstand of small electronic enclosures (app. one cubic foot or
less in volume). I am aware of UL's impact rating test, but I am looking
for something a bit more aggressive. Is there such a
Hello Brian,
To my recollection (and in simplified form):
Maximum Output voltage, less than 30V rms/42.2V peak/60V DC (including
open circuit)
Maximum Output current, less than 8 Amps, at one minute of overload,
including short-circuit
Charts and Tables within the standard further clarify
Nick,
What EN's did your product meet? EN 1010, EN60204 and EN292-1 2 are the
closest relevant spec's I've used which relate to SEMI S2. You may want to
look at the Machinery Directive, Low Voltage Directive and the EMAS
Voluntary Directive ( Environmental Management and Audit Scheme) for
My attempt to attach these files for all of you to download did not
work, as the system won't allow the attachments.
Here's the plan:
If you would like a copy of PSMA's Units, Symbols and Style Guide, and
my Writing Guide, just send me an email. I'll reply with a .pdf file
for each.
It will
Hi Xing,
Find my comments below marked with ***.
Your email stated:
Our test lab receive a CB TEST REPORT FOR NATIONAL RECOGNIZATION,
the EUT is a class II ac adapter having a bridging capacitor (4700pF)across
the reinforced
insulation
The touch current measured by CB is 0.17mA(4700pF
This website is for the German RAL agency, which has responsibility for the
Blue Angel environmental requirements for products in Germany.
http://www.blauer-engel.de/willkommen/willkommen.htm
Thanks-
Mark M.
-Original Message-
From: Tyra, John [mailto:john_t...@bose.com]
Sent: Monday,
The Nordic countries (Sweden, Norway, Finland, Denmark) have done the most
research into this issue, that I am aware of. If you look into the TCO
(Swedish Workers Union) website, you can find standards relating to ELF
VLF magnetic and electrical fields exposure.
http://www.tco.se/eng/
Thanks-
More info - very good info I think - at
http://www.rfi-wireless.com/pages/press/articles/ART014.htm
Regards
- Chris
-Original Message-
From: Fang Han [SMTP:f...@qualcomm.com]
Sent: Monday, June 24, 2002 6:45 PM
To: emc-p...@majordomo.ieee.org
Subject:ESAs
I remember reading an article about this in New Scientist. After several
years of operation they had found the Trees to either side of the
antenna were growing taller and stronger than the rest of those in the
Forest.
Andrew Carson
Senior Compliance Engineer
Xyratex, UK
-Original
Here is the link to the scope on UL's website.
http://ulstandardsinfonet.ul.com/scopes/1310.html
Regards,
Alex McKinney
Safety Engineer
LXE, Inc.
Tel: 770-447-4224 x3606
Fax: 770-447-6928
-Original Message-
From: Brian McAuliffe [mailto:i...@mcac.ie]
Sent: Tuesday, June 25, 2002
We've had an enquiry from someone who wants to sell CE marked
semiconductor manufacturing plant to a location in the far east. They
are hoping that they can find a way of correlating the EN standards
which they have already applied for CE marking purposes to the SEMI
standards which their
I don't have a copy, but if we were to refer to ISO
31-0:1992, I'm certain answers to these questions would be
revealed.
Abstract from the ISO web site:
Gives general information about principles concerning
physical quantities, equations, quantity and unit symbols,
and coherent unit systems,
Can anyone define, or point me to a definition of, a Class 2 Power Unit i.e.
as covered by UL 1310.
I know I could buy the standard to find out but ..
Brian McAuliffe
MCA Compliance Solutions Ltd
Unit 2 Lissane Business Park|Clarecastle|Co.Clare|Ireland
w: www.mcac.ie
e: i...@mcac.ie
t:
Xing,
Section 5.2.3 of IEC 60950 (2nd edition) shows how this
measurement is made for Class II equipment. This should
be the same in China's GB 4943? standard.
See the paragraph near the end of 5.2.2 describing that
for Class II, accessible conductive parts or metal foil
wrapped around the
Xing,
Look up Annex D of the IEC 60950 standard. This annex gives you two
alternative methods for the measuring instrument (figures D.1 and D.2).
Regards
This e-mail message may contain privileged or confidential information. If
you are not the intended recipient, you may not disclose,
Muriel,
Don't know if there are any agency type regulations but can remember this
issue came up when the government wanted to install a communications
antenna in the north woods of Wisconsin. The antenna was to be used to
communicate to submarines deep under water using something like 30 Hz
Spot on Tom!
I have always stuck with lower case k - even when entering values
in a database which is all in upper case! Of course, this scientific
correctness lasts only a few days before someone spots my wonderful
room temperature components, dips them in liquid nitrogen and the
next thing I
Xing,
Yes, 0.25mA is very strict for 950. However, I can assure you that depeding
on the test lab and uncertainty of the test equipment, you will obtain
slightly different results.
This e-mail message may contain privileged or confidential information. If
you are not the intended recipient,
Hi Mr. Peter:
Our test lab receive a CB TEST REPORT FOR NATIONAL RECOGNIZATION,
the EUT is a class II ac adapter having a bridging capacitor (4700pF)across the
reinforced insulation
The touch current measured by CB is 0.17mA(4700pF declared)
but the value we measure is 0.28mA(4700pF)
which
Dear SIRS:
Thanks for your e-mail
A further question for touch current:
Is it (0.25mA) strict for Class II equipment ?
0.28mA rms is OK FOR IEC60065
0.28mA rms is not OK for IEC60950
Any comments are appreciated
Best Regards
XING WEIBING
2002-06-25
- Original Message -
All,
Our joint NPSS and EMC Society meeting tomorrow, June 26th, features two
speakers. Due to the extensive technical program, the social hour with
light refreshments will begin at 6:30 PM and the technical meeting will
start at 7:00 PM. The joint meeting will be held at EMC Corporation's
Dear all,
The capital W is probably a font translation error that was not spotted. I
had much heart ache over this whenever I print something in a different
computer. I have had much experience with entire documents that have the
greek lower case m (micro=u=greak mu) being subsituted for a
Another interesting thing -- not the same as this -- is what happens to
the upper-case Omega some documents use instead of spelling out ohms;
some software turns it into W. I could have SWORN I'd see a 1000 W
resistor on a modem card!
Cortland
---
This
Brian,
The short answer is that a Class 2 Power Unit is what we would
normally call a wall wart or a brick power supply.
Clause 1.1 of UL 1310 (August 21, 1992) says:
These requirements cover (1) direct plug-in Class 2 power units
intended for connection to a 15-ampere nominal 120- or 240-volt
The history is lost in committee activities from years ago, but I can
provide my own thoughts.
The limit for accessible parts on circuits not connected to protective
earth is set below the threshold of sensation, since that current is
likely to pass through the user in normal use if he touches
On Mon, 24 Jun 2002 11:17:18 -0700,
Robert Macy m...@california.com wrote:
Still use KHz
For me it's a logical carrier over from
small letter = small value
capital letter = large value
SI units are originally described in The International System of
Units (strictly, in French)
Muriel:
I know of no such standards or recommendations. Unfortunately, if you could
think to ask the question, someone else is eventually going to think that
there should be such recommendations or regulations.
Considering that the forest, lakes, land are bombarded with 1 kW per square
meter of
Don, you're probably right in that it went the other way.
My super and I had quite a laugh about it till some poor
purchaser told us what was up. - Doug McKean
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc
Hi folks,
I'm glad this subject came up, and am glad to offer some help. The
subject of these units, notations, etc. has fascinated me for years, and
finally I set about to get to the authoritative sources. Over the past
couple of years, I've done the research and published the results.
Here
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