Hi group. A quick question:
Does anyone know what kind of certification or DOC is required for bluetooth
computer peripheral products in Azerbaijan? Though Azerbaijan is a former
CCCP member, I wonder if a GOST certificate is required for import or
operation there. The product in question
In a message dated 6/19/2003 2:46:15 PM Eastern Standard Time,
drcuthb...@micron.com writes:
Doug,
I believe that 94V-0 indicates that the board is self-extinguishing. How
about lighting it with a flame, or a glowing PCB trace, and then remove the
flame. The board fire should go
out.
First of all I would update the note to say the board manufacturer must
be a recognized printed wiring manufacturer, and then call out the flame
rating you need on the board. You'll need the manufactures name or trademark,
board model (single or multilayer), and the flame ratings stamped on
When the model says something does not work, I believe it. When the model
says something works, I take it with the several grains of salt.
Don Borowski
Schweitzer Engineering Labs
Pullman, Washington
USA
Dave Cuthbert wrote on 06/19/2003 02:45:40 PM:
Ran some more simulations. This is
Tim:
The main problem I have seen with the wire mesh often referred to as
hardware cloth, is it tends not to lay flat, although, that problem may not be
so bad on a concrete foundation. Be cautious about the material grade; the
more heavy duty the better it will lay and last. As discussed
Ran some more simulations. This is enough to tell me that the fence is not a
good thing. The dipoles were changed to vertical polarization, both centers at
a height of 1 meter. At 300 MHz there is a 0.4 dB difference with and without
the fence.
Then the frequency was changed swept around. A bad
Bryan -
The only required markings are manufacturer's name and type
designation. Marking the flammability classification is
optional.
Regards,
Peter L. Tarver, PE
Product Safety Manager
Sanmina-SCI Homologation Services
San Jose, CA
peter.tar...@sanmina-sci.com
From: Cole, Bryan
All -
For those not familiar with Greg Gallucio's background, he
used to head up the plastics and printed wiring boards
(PWBs) group at UL's Melville, NY, office (among other
things). During my tenure at UL, I also did work in those
two product categories; my wife spent many years working
with
Tim,
I ran a quick NEC-2 simulation to see what the fence does. Parameters:
Horizontal antennas, Dipole #1 at 1 meter height, dipole #2 at 2.6 meter
height (in main lobe of dipole #1), dipoles 10 meters apart, perfect GND. Freq
is 300 MHz. A fence runs parallel to the line between the antennas.
Tim,
There are many different ways to build a ground plane. If it is close to
grade, ground rods don’t have much impact (at least not in my experience).
They primarily help with electrical safety.
I’ve built 3 OATS facilities in my career. Size matters. Drainage helps.
#1 was a
Doug,
I believe that 94V-0 indicates that the board is self-extinguishing. How about
lighting it with a flame, or a glowing PCB trace, and then remove the flame.
The board fire should go out.
Dave
From: POWELL, DOUG [mailto:doug.pow...@aei.com]
Sent: Thursday, June 19, 2003 10:48 AM
To:
I read in !emc-pstc that gr...@test4safety.com wrote (in 006f01c3366b$a
3375960$cf00a8c0@menhaden) about 'Transverse Balance Limitations
68.310_On Hook' on Thu, 19 Jun 2003:
I have also noted that the Earth Leakage current can vary significantly. My
worst experience was connecting a LAN between
I read in !emc-pstc that richwo...@tycoint.com wrote (in 846BF526A205F8
4BA2B6045BBF7E9A6A0467606F@flbocexu05) about 'New EU Member States' on
Thu, 19 Jun 2003:
Thanks to those who responded. I found and searched the whole treaty
concerning the assession of the new members states. There is
In a message dated 6/19/2003 2:04:28 PM Eastern Standard Time,
peter.tar...@sanmina-sci.com writes:
Greg -
My recollection of the FUS Procedures is that they checked
the laminate's manufacturer and type designation, but not
necessarily the flammability classification. Did that
change
There have been some good tips on checking UL compliance. Every PWB that is
UL recognized needs to be stamped with the company name (or mark) and the
style of marking of the rating, 94 V-2, 94 V-0, etc. One way that we check is
by using UL's web site. Here is the link to where you can search on
Hi Doug:
The question is, how do I independently validate the material used, since a
vendor could theoretically choose whatever they want and stamp it as V-0?
I interpret your question as to how to determine
whether or not a PCB is counterfeit or not.
A UL-certified PCB would have
94V test procedure:
www.portplastics.com/download/pdf/plastics/ techspecs/techspecs24.pdf
burn, baby, burn
Dave Cuthbert
Micron Technology
From: Peter L. Tarver [mailto:peter.tar...@sanmina-sci.com]
Sent: Thursday, June 19, 2003 12:30 PM
To: EMC-PSTC (E-mail)
Cc: POWELL, DOUG
Subject:
Hello everyone,
Thanks for your input. I can go somewhat diagonal to the fence with the test
site. With this angle, the EUT end will be closer to the fence than the
antenna. I can also change the chain link fence to a wooden fence, but this
fence is built on top of a 2 foot concrete retaining
Got it now:
http://www.portplastics.com/plastics/techSpecs/index.html
and hit UL Test Procedures
Dave Cuthbert
From: drcuthbert
Sent: Thursday, June 19, 2003 2:05 PM
To: 'Peter L. Tarver'; EMC-PSTC (E-mail)
Cc: POWELL, DOUG
Subject: RE: PCB marked for UL 94V-0
94V test procedure:
Doug -
Chances are very good, if the finished board is V-0, the
base laminate would also be capable of V-0, even if not
separately tested. The converse is not necessarily true.
I've seen V-0 laminates not comply with V-2 requirements
after particularly harsh fabrication processes or overstated
Greg -
My recollection of the FUS Procedures is that they checked
the laminate's manufacturer and type designation, but not
necessarily the flammability classification. Did that
change before you left UL?
I note that the QMTS2 Guide Card only requires
manufacturer's name and type designation.
Doug,
In researching the book that I am writing for Kluwer, Robust Electronic
Design Reference, I ran across the following booklet:
Lund, Preben, How to Design Printed Circuit Boards for UL
Recognition. Westlake Village, CA: Bishop Graphics, 1983.
In my manuscript, I discuss UL
Doug, do you mean the only the substrate or a PCB with the copper and
soldermask in place?
Regards,
Lou Aiken, LaMer LLC
27109 Palmetto Drive
Orange Beach, AL
36561 USA
tel ++ 1 251 981 6786
fax ++ 1 251 981 3054
Cell ++ 1 251 979 4648
- Original Message -
From: POWELL,
Thanks to all who replied offline to my recent enquiry - once more this forum
proves its great worth.
By way of giving something back, and as a parting shot before I disappear for
a fortnights holiday in the South of France, I thought I'd share with the
group this little used SI unit:
The
From: John Woodgate
Sent: Thursday, May 08, 2003 11:25 AM
Pommerenke, David davi...@umr.edu wrote
in about 'ESD gun verification'
on Wed, 7 May 2003:
Brain,
Spelling!
This morning, while going through some of the list e-mails
I've had to skip over, I spotted the above and was reminded
Tim,
The best advice is to set up the chicken wire as a ground plane and take full
sets of NSA. Perform these measurements just as if you were on the completed
site, including keeping yourself and your measurement equipment out of the
ellipse. If you don't meet NSA, then re-orient the site and
I have also noted that the Earth Leakage current can vary significantly. My
worst experience was connecting a LAN between two systems (with individual
ELC3.5 mA) and watching the ELC rise to more than 8 mA.
Even powering them both from the same isolating transformer made little
difference - Some
I meant tie in a figurative sense only, meaning related.
From: Charles Grasso cgrassospri...@eartlink.net
List-Post: emc-pstc@listserv.ieee.org
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List-Post: emc-pstc@listserv.ieee.org
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Date: Wed, 18 Jun 2003 22:38:30 -0700
You can't go wrong by having an oversized ground. I understand that tapering
the ground plane into the earth provides a better impedance match, althought I
did not do that on our 10m site. I did make the plane larger than required,
however and used several ground stakes on each side. I recall
I read in !emc-pstc that Alex McNeil alex.mcn...@ingenicofortronic.com
wrote (in 5685ADDE2285D511925200508BB9F5031EC502@fort2) about
'Transverse Balance Limitations 68.310_On Hook' on Thu, 19 Jun 2003:
Hi All,
Thanks to all who responded to my query. I will inform you of my findings as
soon as
There will be a Northeast Product Safety Society meeting on Wednesday,
June 25th, 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 are two
Rich
See http://europa.eu.int/comm/enterprise/regulation/pecas/pecas.htm
for the PECA's relating to Hungary, Czech Republic, Lithuania, Latvia,
Slovenia, Slovak Republic, Estonia
Brief info also given on Poland, Malta, Romania, Bulgaria - see also the
hyperlinks on the page called negotiations
Tim,
I have some experience with the problem you are trying to solve.
I specified a site that we used for calibrating EMC antennas. As I
understand it, you can almost achieve the NSA to +/- 4dB without
any metal on the ground at all, so don't worry too much about
putting down metal that is
Hi All,
Thanks to all who responded to my query. I will inform you of my findings as
soon as I have a solution.
Kind Regards
ALEX
From: Alex McNeil
Sent: Tuesday, June 17, 2003 10:09 AM
To: 't...@world.std.com'
Subject: Transverse Balance Limitations 68.310_On Hook
Hi Group,
Can you help
I think Mr. Grasso misinterpreted my remark. In turn I may have
misinterpreted the original question. I thought the question referred to a
perceived conflict within C63.7 between the elliptical clear area and ground
plane dimension requirements. I said that the two are not in conflict, they
From: emcp...@aol.com
Reply-To: emcp...@aol.com
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
List-Post: emc-pstc@listserv.ieee.org
Date: Wed, 18 Jun 2003 20:13:25 EDT
Also, there is a chain-link fence running parallel with the
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