Jan,
I can answer the first part of your question. In October 2002, I
attended a presentation given by representatives of China's CNCA. At
that time, plans existed to eventually certify labs outside of China,
but it was not expected to occur in the foreseeable future. Note that
this was
I think the spurious emissions would be a big problem. You would be
amazed at the levels of EMI emitted by phones when they are in certain
modes. While looking at some dual tri-mode digital phones from 3
different manufacturers (while placing digital calls in the 1800± MHz
range?? or
Kim,
Here's how I would do it. Note that I'm assuming that we're dealing
with SELV circuits here and your concern is SI/EMC on circuit packs for
a shelf system. Safety grounding is another issue entirely.
First screws:
I'd use split washers with flat beneath (if lock washers at all) to
To: Agilent Technologies and Hewlett-Packard:
The administrators of the IEEE emc-pstc listserver
apologize to Agilent Technologies and Hewlett-Packard
for the derogatory remarks recently posted to this
listserver.
We take every effort to maintain a high level of
professionalism in
Greetings all,
Rich, Jim, Ron and I ask that this thread be closed. We do not feel
that this forum is the place for your complaints to be voiced as this is
technically off-topic and appears as noise to many of the subscribers.
Also, bashing a company is really no different than bashing
Andre,
I think that in section 1.7.12 (the section you referenced in the
60950 family) there is also a provision that for service personnel, the
language on safety related info can be English. (except in Germany,
where it must also be in German). I would take this to mean that
component
Gary, All,
Office networking equipment (ethernet/network hubs, switches,
Ethernet PCI Cards, etc) are included in the definition.
I attended a US Dept. of Commerce seminar with a delegation from the
CNCA and that was one of the questions raised and answered - so it's
strainght out of the
Try 50091-2. That's the Euro one and it includes EMI immunity and
covers the different operating modes. For domestic products (assuming
you're in the US, that is) the normal FCC rules apply - just be sure to
test all the operating modes (to cover all the bases, 0%, 50%, and 100%
load in
I believe that DT is the only carrier that uses -60Vdc CO's, but I think
that it is only present in their older CO's.
It's not that hard to meet the requirements though - just maintain 1mm
(40th) creepage clearance between TNV-2 and SELV, GND, etc (up to your
DC/DC's/opto-isolators/bridging
Jeff,
I think the difference may be in the distributed ground arrangement
in the CBN. In a surge event, the CBN would distribute the energy from
a lightning event and common mode voltage differences within the CBN
would minimal (hence the exemption).
In an IBN (shielded w/isolated ground),
Kim,
You DO need to register. Testing may not be required, but is
strongly encouraged regardless (technically you can refer to the laser
component manufacturer's results).
Note: This is assuming that you aren't just putting an off the shelf
enclosed CD/DVD ROM drive in a system, which
Most UPS's use a stepped approximation of a sine wave when in battery
mode. While most switching supplies don't care (and are the intended
loads for these UPS's), surge suppressors can cause real issues - It has
something to do with capacitive overload of the output circuits.
And for the
Jan,
802.11h is in the works which will share some of the 5GHz band with military
radar and be a somewhat worldwide standard. I believe that 802.11i will
shortly follow with added security enhancements. I have a presentation on
this somewhere but can't locate it for more details at the moment
Forwarded for Paul Mohr. Please reply only to Paul Mohr as described below.
Best Regards,
Dave Heald
EMC-PSTC Admin
GREETINGS TO ALL!
An EMC lab in San Diego County is looking for a self motivated engineer (B. S.
degree required) with at least 3 years experience to specific EMC regulations.
Greetings all,
I remember hearing somewhere ( it seems that I found the answer
somewhere but I can't remember) that there is a stipulation for European
compliance that one should have 80% certainty that 80% of one's products
are compliant. I have no idea where this idea originally came from or
Forwarded for Nick Martin. Please 'Reply All' and/or CC:
ni...@tsd.serco.com when replying.
Dave Heald
EMC-PSTC Admin
Original Message
Subject: User Warning Signal Words
List-Post: emc-pstc@listserv.ieee.org
Date: Wed, 07 Nov 2001 13:33:48 +
From: Nick Martin
Chris,
Greetings! You may not even need to perform production line hipot if
the unit is a fiber only product. Since the mains are SELV (unless you
are shipping to certain Euro Telco's) the only time you should need
production line hipot is if you have wired (TNV-2 or TNV-3) interfaces,
Is this equivalent to UL 60950? If so, the differences may be
substantial.
Dave Heald
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion list.
Visit our web site at:
forwarded for Gaby Abboud. Please reply all or send replies directly to
gabb...@zoom.com
Original Message
Subject: PC cameras
List-Post: emc-pstc@listserv.ieee.org
Date: Thu, 4 Oct 2001 08:49:23 -0400
From: Gaby Abboud gabb...@zoom.com
To: IEEE (E-mail)
Greetings, all
I have a quick question about exporting to Thailand. On my country
matrix Thailand is listed as requiring CISPR22 only (no safety, etc).
Does anyone know if this is actually the case.
BTW, I have finally determined that my country matrix is not company
proprietary info, so
forwarded for Steve Williams.
Original Message
Subject: Re: RTI on Plastics
List-Post: emc-pstc@listserv.ieee.org
Date: Tue, 2 Oct 2001 10:56:00 -0400
From: steve.willi...@apcc.com
To: tony.reyno...@pb.com
CC: emc-p...@ieee.org, owner-emc-p...@majordomo.ieee.org
Tony, some
Forwarded for Ron Allen ral...@tuvam.com
Original Message
Subject: RE: Low-Power Transmitter Approvals
Date: Thu, 20 Sep 2001 19:51:19 -0400
From: ral...@tuvam.com
To: j.schan...@worldnet.att.net,
wo...@sensormatic.com,emc-p...@majordomo.ieee.org
Richard,
Forwarded for Eric Meunier
Original Message
Subject: RE: LVD testing suite for ITE devices
List-Post: emc-pstc@listserv.ieee.org
Date: Thu, 30 Aug 2001 18:08:34 -0400
From: Meunier, Ériceric.meun...@ca.kontron.com
To: emc-p...@majordomo.ieee.org
For Ethernet ports you may also
Greetings,
Let me add something to Joe's position (which I agree with entirely)
based upon my experience at a former job. Some products with no ground
or not so great grounds will need time (one sec or sometimes more)
between discharges to ensure that there is no build up of charge on the
Greetings all,
At a former job, I actually performed many scans of LCD monitors from
many 'unnamed' manufacturers and found them to be different from
normal CRT's for emissions purposes. The LCD's would incorporate fast
(for monitors) clocks for processing. I have seen clocks anywhere from
65
I have used Miteq or Mini-Circuits preamps with a custom box (Al project
box) and a 15Vdc regulator. These had around 20dB of gain which was
sufficient at 3 or 1 meter for most frequencies between 1 - 18 GHz. The
exact model that we used has been discontinued though and I am unsure if
a
Greetings all,
I just peeked at GR-63 and it appears that a 9-10' height for cabling
trays is normal (Figure 2-4). You are correct that GR-1089 is very
vague on the requirement (something like line of sight??). Due to the
final installation config, I would go with a 9' cable crossbar height
Forwarded for Dan Irish dan.ir...@sun.com
Original Message
Subject: Re: FCC + FCC = FCC?
List-Post: emc-pstc@listserv.ieee.org
Date: Tue, 19 Jun 2001 19:14:03 -0400 (EDT)
From: Dan Irish - Sun BOS Hardware dan.ir...@sun.com
Reply-To: Dan Irish - Sun BOS Hardware
Forwarded for Gaby Abboud. Please CC: Gaby gabb...@zoom.com with on
any replies.
Regards,
David Heald
Original Message
Subject: Amendment of Spanish Channels
List-Post: emc-pstc@listserv.ieee.org
Date: Mon, 18 Jun 2001 10:24:43 -0400
From: Gaby Abboud gabb...@zoom.com
To: 'emc
Forwarded for Bert Planting.
Original Message
Subject: Re: Laser Safety
List-Post: emc-pstc@listserv.ieee.org
Date: Mon, 18 Jun 2001 06:59:41 +0200
From: Bert Planting bert.plant...@asml.com
Organization: ASML
To: Matt Kilkenny mkilke...@opthos.com
CC:
Greetings everyone,
I just chatted with one of the authors of ANSI C63.4 (1992) where the
procedure for radiated emissions is defined. I found out that it was
the committee's intent that the distance be measured from a radius set
by the furthest point of the EUT during rotation. Of course the
Forwarded for Susanne Delisle. Please cc Susanne
(sdeli...@unispherenetworks.com) on any replies
Original Message
Subject: Field wiring terminal size
List-Post: emc-pstc@listserv.ieee.org
Date: Fri, 8 Jun 2001 10:09:11 -0400
From: Delisle, Susanne
Forwarded for Mike Hopkins.
Original Message
Subject: RE: ESD Question
List-Post: emc-pstc@listserv.ieee.org
Date: Wed, 30 May 2001 16:06:48 -0400
From: Mike Hopkins mhopk...@thermokeytek.com
To: 'Chris Maxwell' chris.maxw...@nettest.com,'Sandy
Mazzola'mazzo...@symbol.com,
Forwarded for John Kehs (jk...@witusa.com). Please direct all responses
to John.
Regards,
David Heald
Original Message
Subject: Search for a Gtem Cell
List-Post: emc-pstc@listserv.ieee.org
Date: Wed, 30 May 2001 07:18:40 -0400
From: Kehs, John jk...@witsusa.com
To: 'emc-p
Forwarded for Daniel Biggs daniel.bi...@gefanuc.com. Please include
Daniel in any replies.
-Dave Heald
Original Message
Subject: ESD Gun recommendations?
List-Post: emc-pstc@listserv.ieee.org
Date: Tue, 22 May 2001 11:04:23 -0400
From: Biggs, Daniel (IndSys, GEFanuc, NA)
Greetings all,
I am looking for recommendations for a NEBS environmental test lab
that has an operational temp/humidity chamber of significant size and
with tremendous cooling capacity (8kW or more). I have a large
(6+'wide, 7+'tall) telecom product that consumes about 8kW of energy
during
Greetings Joe and everyone,
I can't speak for lab equipment, but I know that for UL 1950 (EN
60950/ IEC 950) my former employer (a recent NRTL who works/worked
closely with the biggest) would always test with the mains switch both
on and off. If you think about it, it makes sense to test with
How about the good old HP Harmonic Flicker Test Sysytem that Agilent was
thinking about discontinuing support on? (remember that thread a while
ago?) I don't know about the current (it seems like I remember 9-10A
max), but I know you could dial in any voltage and frequency
(DC-500Hz??) and it
Forwarded for Gaby Abboud. Please CC Mr. Abboud gabb...@zoom.com on
any replies.
David Heald
Original Message
Subject: Romania certifications
List-Post: emc-pstc@listserv.ieee.org
Date: Wed, 9 May 2001 14:28:34 -0400
From: Gaby Abboud gabb...@zoom.com
To: emc-p
Greetings everyone,
I was wondering if anyone has already worked this out. The test
under question measures the sound power level generated by fan trays or
other noise producing structures in Central Office type telecom
equipment.
ETS 300 753 Acoustic noise test calls for the test to be
Forwarded for Jun Nakamura. Please include Mr. Nakamura
(nakamur...@naka.melco.co.jp) on any replies
Dave Heald
Original Message
Subject: Re: Product Safety - Japan
List-Post: emc-pstc@listserv.ieee.org
Date: Sat, 05 May 2001 23:10:05 +0900
From: nakamur...@naka.melco.co.jp
Forwarded for Joel Mandel. Please select reply all when responding or
include Joel in your CC line joel_man...@adc.com.
Dave Heald
-Original Message-
From: Mandel, Joel
Sent: á îøõ 19 2001 10:33
To: 'emc-p...@ieee.org'
Subject: Field trial requirements
Hi All
Does
+GHz range, but anyone with experience please feel free to chip
in.
Thanks in advance
David Heald
Senior EMC Engineer/
Product Safety Engineer
Curtis-Straus LLC NRTL
Laboratory for NEBS, EMC, Safety, and Telecom
Voice:978.486.8880x254 Fax:978.486.8828
www.curtis-straus.com
message, but didn't
elaborate at all. These are very important considerations that can
greatly affect any expected correlation to a 10m OATS.
--
David Heald
Senior EMC Engineer/
Product Safety Engineer
Curtis-Straus LLC NRTL
Laboratory for NEBS, EMC, Safety, and Telecom
Voice:978.486.8880x254
. If you come up with
marginal near field readings, be prepared for the worst when you take 10m
readings. Finally, be sure to check BOTH antenna polarities.
I hope this helps
Usual employer disclaimer . . .David Heald
Senior EMC Engineer/
Product Safety Engineer
Curtis-Straus LLC NRTL
Laboratory
Forwarded for Alain Samlai alain.sam...@gigabyte.com.tw due to strange
internet phenomena.
Enjoy
Dave Heald
EMC-PSTC Admin
Cecil
the CCIB has a page relating to CCC, but in its Chinese section only.
http://www.cqc.com.cn/ccc.htm
just click the links to open the PDF files and view the new
Forwarded for Paul Smith. Please CC:paul_j_sm...@teradyne.com on any
relpies.
Dave Heald
EMC-PSTC Admin
Original Message
Subject: Who or what is W letter in a circle
List-Post: emc-pstc@listserv.ieee.org
Date: Mon, 10 Dec 2001 15:33:29 -0500
From: paul_j_sm...@teradyne.com
-pstc
For help, send mail to the list administrators:
Jim Bacher: jim_bac...@mail.monarch.com
Michael Garretson:pstc_ad...@garretson.org
For policy questions, send mail to:
Richard Nute: ri...@ieee.org
--
David Heald
Senior EMC Engineer/
Product
tests to only
those cables that leave the building. I hope this helps.
David Heald
Guy Story wrote:
I am looking to see what the general conception is on I/O port conducted
emissions and surge immunity is. The company I work for manufactures
various types of network cards. Some of these tie
Forwarded to the list for xingwb xin...@cesi.ac.cn.
Dave Heald
EMC-PSTC Admin
Begin forwarded message
Hi group I have a question regarding clearance and working voltage of
IEC60950. If I HAVE A AC ADAPTER(AC 100-240V 50/60Hz) ,THE WORKING
VOLTAGE MEASURED ARE AS FOLLOWS: Nominal supply voltage:
Mark,
Is this section applicable to your product? Section 9.10 only applies
to equipment that was formerly installed in an IBN system (now in a
CBN), and newer products rarely fall into this category. At my last
job, I performed a lot of GR-1089 evaluations and 95% of the products
were exempt
opportunities outside the USA,
if the opportunity seems right).
Thanks and Best Regards,
-David Heald
- This
message is from the IEEE Product Safety Engineering Society emc-pstc
discussion list. Website: http://www.ieee
to the list administrators:
Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org
For policy questions, send mail to:
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All emc-pstc postings are archived and searchable on the web at:
http://www.ieeecommunities.org/emc
I remember working on such a filter a few years ago and from what I remember
there were no isolation type components - it was more of a high pass/low
pass filter rather than an isolation type device. This is just my memory
though, so I could be wrong.
If you think about it though, there is
Dan,
Read on below R9-20 and the requirement is clarified significantly. The
requirements are DEFINITELY applicable to the outputs of your DC/DC
converters (a.k.a. embedded DC power supplies):
If your 48V feeds into a power supply circuit pack/module which then
supplies the 3.3, 5, 12, etc...
But they do ask for an AC convenience outlet location in the bottom of every
rack (granted I've never actually seen a CO installation so I don't know if
they actually install the AC convenience outlets).
Dave
-Original Message-
From: Cortland Richmond
To: christine...@aol.com; ieee pstc
Greetings all,
In the spirit of the continual quest for cost reduction, I have been asked
to look into the use of thermal circuit breakers instead of magnetic ones.
It seems like we rejected thermal breakers before for some reason, but now
no one can remember why.
Does anyone know of any
After looking through the Circular Relevant to the Implementation of the
Compulsory Product Certification System, I found the following in section
2.5:
Starting from May 1, 2002, with regard to products for which the Old
Certificate and the Old Mark was compulsory but no longer covered by the
breeze would upset the characteristics of the
site?
Michael Sundstrom
NOKIA
TCC Dallas / EMC
ofc: (972) 374-1462
cell: (817) 917-5021
amateur call: KB5UKT
-Original Message-
From: ext David Heald [mailto:dhe...@tellium.com]
Sent: Monday, July 08, 2002 12:50 PM
To: emc-p
I can't offer quantitative experience, but I can offer some theory that has
always made sense to me (and my results were usually quite repeatable at my
last job where we employed these practices):
While the measurement site itself probably has a defined ground plane for at
least most of the
Dude,
The CO will wire your power inputs with two separate power pairs feeding
from two different sources. This way, if there is some fault in the
'primary' centralized distributed DC source, the redundant source can take
over without the product losing power.
I think the test method depends
Forwarded for Matt Campanella
Original Message
Subject: Northeast Product Safety Society Meeting on Wednesday, February
27
List-Post: emc-pstc@listserv.ieee.org
Date: Wed, 20 Feb 2002 19:14:16 +
From: matt.campane...@att.net
To: emc-p...@majordomo.ieee.org
There will be a
Forwarded for Patty Knudsen patricia.knud...@ericsson.com
Original Message
Subject: RE: TUV NRTL
Date: Mon, 11 Feb 2002 11:11:12 -0600
From: Patricia Knudsen (EWU) patricia.knud...@ewu.ericsson.se
To: 'Doug McKean' dmck...@corp.auspex.com,EMC-PSTC Discussion
Greetings all,
In my days at an EMC test house, we used Dell Dimension series P1 -133
to 200's and PII 233-300's with great success. I think Micron may have
used the same case as well. The dells were opened daily but kept their
excellent shielding for at least 2-3 years. Good luck finding
Forwarded for John Roche. Please direct all replies directly to John
(do not 'reply all') Thanks.
Best Regards,
Dave Heald
EMC-PSTC Admin
Original Message
Subject: Compliance Engineer seeking position
List-Post: emc-pstc@listserv.ieee.org
Date: Fri, 18 Jan 2002 09:11:11
Does your equipment plug into a primary (AC) circuit? Any TNV circuit
is considered a secondary circuit and if any and all power is derived
from the TNV network, the notes you referenced would not apply as a
primary circuit is not present.
Best Regards,
Dave Heald
Ed Eszlari wrote:
All,
All,
Please remember that postings about viruses (no matter how well meaning -
and even about those that appear on the listserver) are strongly discouraged
on this forum. Such postings add to the noise on the forum and can greatly
slow email access times for those with dial-up connections.
Well,
In response to question 1, you may want to try for Class 1M. The new
measurement geometries allow many class 3B lasers to be reclassified as 1M.
I would assume (although I have no direct experience here) that the visible
spectrum lasers would also benefit from the new geometries (BTW,
All,
Does anyone know of a sample waveform or general characteristics for worst
case VI on an ESD drain pin when a circuit pack is inserted into an
equipment shelf? This is an odd question I know, but my management asked
for the info and I really have no idea (and it shouldn't happen anyway
But when was the last time you saw a plug rated (just a random example) 250V
3(phase)Y 75A when it means 25A per phase? the 75A rating is definately
'per phase'.
-Original Message-
From: Spencer, David H [mailto:david.spen...@usa.xerox.com]
Sent: Thursday, October 31, 2002 8:16 AM
To:
John,
I recently attended a workshop with CNCA delegates and found out that
central office equipment is exempt from the CCC. However, central office
equipment is still required to obtain a Network Access License from the MII
(Ministry of Information Industry) which includes Safety, EMC, and
Rich,
I believe that the reason CO's are exempted from many of the building
codes is the amount of work we put in to ensure that the products are safe
and reliable. The sprinkler exemption comes from the fire spread
requirement in GR-63. Basically, if the fire has been demonstrated to be
Peter,
As someone who rates their products the same (well, without the
label/manual discrepancy), I can say with confidence that the product is
TNV-2 due to input supply deviations (60V ± a few). This isn't really as
bad as it sounds, though, as the only real issue you will have is
maintaining
All,
I'm trying to convince a few people here that completely separating the
digital and chassis grounding on our product is not always the best way to
go. Unfortunately, a lot of the people I'm dealing with are ex Bellcore
engineers who worked a lot with isolated grounds and are convinced
Folks,
I've been searching all afternoon for recent news on halogen flame
retardent regulation in the EU. I'm beginning to think that other than
brominated flame retardents, there really is not much current concern and
the risks involved with accelerated fire spread (over that with halogenated
Greetings all,
Does anyone know the time length of the condensation cycles in IEC
60068-2-30 (EN 300 019 states that the condensation test lasts 2 cycles and
references 60068-2-30 as the test method).
Thanks in advance!
Dave Heald
---
This message is
Does anyone know where the halogen restrictions for wire insulation in the
EU come from? I remember dealing with this issue sometime in the last few
years, but now I can't remember where the actual requirement came from.
Also, does anyone know if the Halogen restrictions only apply to, say,
just to pass a test.
And it turns out we use nickel plate which should be quite durable.
Again, any comments from experience would be welcome, but my guys say
that I shouldn't have problems.
Thanks again!
Dave Heald
David Heald wrote:
All,
I'm preparing for an emissions test and I had
All,
I'm preparing for an emissions test and I had started cleaning some of
my chassis mating surfaces with a pen/pencil eraser then alcohol to
ensure the surface to surface contact was good. A friend then told me
that using an eraser would also remove the anti-corrosive coating that
was on
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