Yes on two recent occasions. But we were able to get them released - before
the steamroller!
G
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Don Clayton
Sent: Friday, January 31, 2003 2:36 PM
To: emc-p...@majordomo.ieee.org
Subject: FCC
I worked on a 1 MW, 160 GHz Gyrotron in 1982 that used a diamond waveguide
window. Yes diamond is the up-and-coming power electronics material with 50X
the thermal conductivity of copper. It is also starting to be used as a
protective thinfilm material.
Dave Cuthbert
From: Fred Townsend
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200301311957.laa25...@epgc264.sdd.hp.com) about 'Unity Power Factor'
on Fri, 31 Jan 2003:
Fluke has a good explanation of the deleterious
effects of harmonics. See:
http://www.fluke.com/ElectricPower/elec.asp
Thank you.
--
John, tubes are like vacuum deposition chambers. I have difficulty believing
that
a fancy form of carbon would be of any use in molded structures, HV, or HVAC.
These conditions are all found in radar tubes.
Also, thanks to Greggs comment about fancy screw drivers, I remembered that
BeCu
screw
The approach that CSA takes is sensible in that it includes both the long
duration overload and high-current short circuit capabilities of the source.
Depending on your situation you can end up needing to do one or both of the
following:
1. Bond Impedance - run a current equal to 200% of the
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200301311743.jaa24...@epgc264.sdd.hp.com) about 'single fault
conditions' on Fri, 31 Jan 2003:
So, the failure of switching FETs could give rise
to both fire and shock, but should not do so if the
equipment construction is according
Has anyone out there had any problems with U.S. Customs
holding a product for lack of FCC report or a declartion
from a manufacturer that product is indeed compliant?
Thanks in advance,
Don Clayton
ESR Engineering Inc.
This message is from the IEEE EMC Society Product Safety
Technical
Richard, the national deviations of countries participating in the CB scheme
can be found in the CB Bulletin that can be purchased from the IEC.
Richard Woods
Sensormatic Electronics
Tyco International
From: Richard Meyette [mailto:meye...@pacbell.net]
Sent: Friday, January 31, 2003 12:54 PM
At 12:22 + 31/1/03, John Woodgate wrote:
There is a proposed amendment to IEC/EN 60950-1 requiring a test of the
protective conductor network at *prospective short-circuit current* for
the time it takes for the mains circuit protective device to operate.
The details are controversial at
It is my understanding that such ports ARE included in the scope. Comments
from experts on CISPR/I indicate that digital TV tends to have higher
emissions than traditional TV signals. The intent of the standard is
clearly to limit emissions from cabling structures. Unless test data shows
Hi John:
Thank you for that and the rest of the information, which could prove to
be very helpful indeed. I would like to use it in my continuing efforts
to defuse the arguments between the former TC74 experts in TC108 and the
SC77A/WG1 people. May I say that the information came
Ground loops
John P. Wagner
Regulatory Compliance Mandatory Standards
AVAYA Regulatory Compliance Laboratory
1300 W. 120th Ave, Room B3-D16
Westminster, CO 80234-2726
Phone/Fax: (303) 538-4241
johnwag...@avaya.com
From: John Woodgate [mailto:j...@jmwa.demon.co.uk]
Sent: Friday, January
I read in !emc-pstc that Wagner, John P (John) johnwag...@avaya.com
wrote (in 4203D61676D0AE468AA5CEA90A891C1302A01467@cof110avexu4.global.
avaya.com) about 'EN55022:1998 and telecom ports' on Fri, 31 Jan 2003:
By the way, CISPR/F has nothing whatsoever to do with ITE. It is CISPR/I and
I read in !emc-pstc that drcuthbert drcuthb...@micron.com wrote (in
cfefa50c9bcad21197470001fa7eba6b14121...@ntexchange05.micron.com)
about 'EN55022:1998 + A1:2000' on Fri, 31 Jan 2003:
How can a ferrite clamp be called a CMAD Common Mode Absorption Device? It
reduces EM radiation
by reducing
GR-1089 does allow a get-out for intra-building surges for STP if grounded at
both ends of the STP cable. Some customers still insist that intra-building
Surges are applied to the conductors regardless of the cable type, STP or UTP.
[We 'design in' Intra-building surge protection (as a mimimum)
I read in !emc-pstc that don_borow...@selinc.com wrote (in
ofc54f7ba7.cab7254d-on88256cbf.0051d...@selinc.com) about 'BeCu
problem' on Fri, 31 Jan 2003:
I have seen stainless steel used as battery contacts. The contacts
developed an oxide on them that made it difficult to get power from the
I read in !emc-pstc that richwo...@tycoint.com wrote (in 846BF526A205F8
4BA2B6045BBF7E9A6A04675BCE@flbocexu05) about 'EN55022:1998 and telecom
ports' on Fri, 31 Jan 2003:
The standard also includes tests for coax and
alludes to emissions caused by imperfect shielding. That seems to imply that
a
Good point John - then we can justify the $5,000 screwdriver.
Gregg
From: owner-emc-p...@majordomo.ieee.org
[mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of John Woodgate
Sent: Friday, January 31, 2003 10:35 AM
To: emc-p...@majordomo.ieee.org
Subject: Re: BeCu problem
I read in
Dave Cuthbert wrote
The nick name for MFJ is Mighty Fine Junk.
Yes it is -- or has been. But I'll jump in here to add that while I've in
the past often been underwhelmed by the quality of some MFJ equipment, I
was favorably impressed with my MFJ-259B. And it is quite useful.
I have one of
Ian, I recommend that you visit the European Commission's EMC web site:
http://europa.eu.int/comm/enterprise/electr_equipment/emc/index.htm
You will find a guide that describes the file requirements and your
obligations for reselling a private branded product. The basic requirements
are not
Unfortunately, EN 55022 is the only available emissions standard for CCTV
products used for security applications. Even the standard for professional
video equipment, EN55103-1, references EN 55022 as does the generic
standard. Perhaps the CISPR ITE committee is not aware that they are
affecting
To all interested parties:
Announcing the RMCEMC Bonus February Meeting
Presenter: Colin Brench, HP Principal Member of technical Staff (Bio)
Date : Feb 5th 2003
Location : Front Range Community College, Westminster Colorado. Room
Timberline (S117)
Times : 5:30 -6:30 Social Hour at the
David Sterner wrote:
UTP has been repeatedly shown to radiate less than STP.
Telcordia GR-1089 exempts STP from intrabuilding surges; the shield is
assumed to carry them. This makes it attractive for US telecom designers
whose equipment uses Ethernet.
Cortland
This message is from the
Hi Bill,
Can you let me know which type of ISM equipment you need info on? For Medical
equipment there are requirements but not Scientific. Industrial depends.
Thanks,
Kind Regards,
Tian Wang-Mendez / Sr. Program Manager
EMC Compliance Management Group
670 National Avenue, Mountain View,
Hi John:
Yes, delta-wye distribution transformer overheating
does occur due to the circulation and dissipation of
the triplen harmonics in the primary (delta) winding.
Thank you for that and the rest of the information, which could prove to
be very helpful indeed. I
Group,
I have a question regarding the country deviations to IEC 60950, 3rd Edition.
Some of the country specific differences are referenced in the IEC standard
as notes to the Subclause. For example, 4.3.6 has notes regarding the testing
of direct plug-in equipment in Australia and the United
Hi John:
The Bad: some FETs fail very violently, and can actually be a fire hazard
and/or shock hazard in open-frame switchers;
Really? There doesn't seem to be enough combustible material to cause a
fire hazard, and an open-frame switcher always has to be in some sort of
LO - internal backup battery weak
50 - not listed
81 - not listed
if the error was actually 580, the amp was not able to complete a probe
offsett adjustment. Make sure the probe jaws are completly closed.
the firmware for my units only displays error codes 260.
Brian
-Original
John -
This proposal is based on a North American D1 Deviation to
IEC60950, Subclause 2.6.3.3, and is derived from CSA 22.2 No
0.4. I have a product in my lab that this applies to and
two more products coming in to which it will also apply.
Regards,
Peter L. Tarver, PE
Product Safety Manager
The Bad: some FETs fail very violently, and can actually be a fire hazard
and/or shock hazard in open-frame switchers;
Really? There doesn't seem to be enough combustible material to cause a
fire hazard, and an open-frame switcher always has to be in some sort of
outer enclosure, doesn't it?
Hi Jan,
In addition to health aspects, BeCu is incompatible with most
enclosure materials and coatings (to prevent rust and corrosion) used
in equipment. After a couple of weeks a BeCu finger in contact with a
chassis will leave a black smudge, the corrosion byproducts resulting
from the
David,
Where in article 3.6 of CISPR 22 is the term multi-user used? Also,
please keep in mind that the ferrite clamps are used only for testing
radiated emissions from table top EUTs. This telecom port conducted
emissions issue (hence the need for article 3.6) is entirely separate.
Ghery
Hi everyone.
We have been working through consequences of the New Proposed Emc Directive.
As we are not a large electronics company so we will not be able to quote all
the standards we quoted today as we don't use equipment detailed in that said
standard.
The new directive states we will
I read in !emc-pstc that Fred Townsend f...@poasana.com wrote (in
3e3a35fb.6ecc...@poasana.com) about 'BeCu problem' on Fri, 31 Jan
2003:
BeO has seven times better thermal conductivity than AlO (alumina). There is
no real substitute for BeO at high power levels. It is still used by the
I read in !emc-pstc that david_ster...@ademco.com wrote (in 2DF7C54A75B
dd311b61700508b64231002c5b...@nyhqex1.ademconet.com) about
'EN55022:1998 and telecom ports' on Fri, 31 Jan 2003:
Earthing STP shields at both ends is potential safety hazard,
How does a safety hazard arise?
--
Regards,
Richard,
Cameras, monitors, etc are not ITE. CISPR 22 does not apply to them.
Ghery Pettit
Intel
From: richwo...@tycoint.com [mailto:richwo...@tycoint.com]
Sent: Friday, January 31, 2003 7:20 AM
To: emc-p...@majordomo.ieee.org
Subject: RE: EN55022:1998 and telecom ports
OK, so widely
As the requirements for conducted emissions on telecom ports developed,
definitions changed repeatedly -- all intended to describe the same cabling.
At one point, extensive networks was used which I think better describes the
situation. However, then the question is What is extensive? Also,
Does anyone out there have a service manual for a Tektronix AM503A current
probe amplifier? I need to know what error code 50 followed by LO
followed by 81 means.
Thanks in advance,
Brent DeWitt
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc discussion
OK, so widely dispersed is a key element in determining if a network needs
to be tested. That is consistent with the problem of long balanced pairs
having common mode emissions. The standard also includes tests for coax and
alludes to emissions caused by imperfect shielding. That seems to imply
The MFJ-259B is available from MFJ Enterprises, a ham radio accessory
company. The nick name for MFJ is Mighty Fine Junk. Autek also makes a
similar device although I haven't tried one. The MFJ-259B SWR analyzer is
basically a handheld impedance meter. It's also good for checking the input
Z of
Jan -
Both Be and BeO pose health risks. While I can't point to
anything to support the claim, BeCu will probably become a
part of the product take back/recycling.
I did text searches of the WEEE and the RoHS Directives and
found no mention of Be in any form.
Be and its compounds are looked
How can a ferrite clamp be called a CMAD Common Mode Absorption Device? It
reduces EM radiation
by reducing the current through the antenna, not by absorbing RF. It
could, however, be called a CMAD Common Mode Attenuation Device.
Dave Cuthbert
From: John Woodgate
I have seen stainless steel used as battery contacts. The contacts
developed an oxide on them that made it difficult to get power from the
battery. Seems to me that some plating could solve that problem however.
There are no good substitues for BeO in all applications. AlN is better
than
See the May 2002 issue
From: drcuthbert [mailto:drcuthb...@micron.com]
Sent: Friday, January 31, 2003 6:55 AM
To: emc-p...@ieee.org
Subject: Helmholtz article
Here is the link to the Conformity magazine article: Magnetic Field
Calibration: Unwinding The Helmholtz Coil, by Isidor Straus
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200301292324.paa09...@epgc264.sdd.hp.com) about 'Unity Power Factor'
on Wed, 29 Jan 2003:
Yes, delta-wye distribution transformer overheating
does occur due to the circulation and dissipation of
the triplen harmonics in the primary
I read in !emc-pstc that Rich Nute ri...@sdd.hp.com wrote (in
200301301638.iaa15...@epgc264.sdd.hp.com) about 'Unity Power Factor'
on Thu, 30 Jan 2003:
As Ken Javor described, in the USA, voltage
distortion is largely a local (privately-owned
wiring) premises problem due to excessive
series
Forwarding for Pauline, please reply to her. Jim
From: Pauline Rodela [mailto:paul...@midcom.com]
Sent: Thursday, January 30, 2003 4:06 PM
Subject: #18328: Engineer (TEMPEST); Grand Rapids, MI
Hello,
I obtained your name and email from the IEEE EMC Society Directors listing
at
I read in !emc-pstc that Gert Gremmen g.grem...@cetest.nl wrote (in
oleokfnbajjejfkplbbmoeelchaa.g.grem...@cetest.nl) about 'EN55022:1998
+ A1:2000' on Thu, 30 Jan 2003:
The official name is CMAD Common Mode Absorption Device.
(before John makes one himself ;))
You mean me? And do you mean
I read in !emc-pstc that boconn...@t-yuden.com wrote (in F7E9180F6F7F58
40858d3db815e4f7ad1f2...@cms21.t-yuden.com) about 'single fault
conditions' on Wed, 29 Jan 2003:
Yes sir, this is another thing I've wondered about; i.e., simulating the
big
bus cap (short) SFC by applying a
I read in !emc-pstc that Collins, Jeffrey jcoll...@ciena.com wrote (in
1d4e6e0235bdf84bb58bace5086d9c518...@wntcsdexg03.oni.com) about
'Translations: Chinese to English' on Wed, 29 Jan 2003:
Can you recommend a company or individual who is competent ( and reasonable
$$$ ) in translating technical
I read in !emc-pstc that Ken Javor ken.ja...@emccompliance.com wrote
(in 0h9j008afer...@mtaout03.icomcast.net) about 'Unity Power Factor'
on Thu, 30 Jan 2003:
Yes I am in the US so clearly I must have been mistaken. Seriously, when
that business started in 1989 there were relatively few PCs in
I read in !emc-pstc that drcuthbert drcuthb...@micron.com wrote (in
cfefa50c9bcad21197470001fa7eba6b14121...@ntexchange05.micron.com)
about 'EN55022:1998 + A1:2000' on Wed, 29 Jan 2003:
And I have used an MFJ-259B (only
$260) to measure ferrites from 1.7 to 170 MHz.
What is an MFJ-259B and
I read in !emc-pstc that richwo...@tycoint.com wrote (in 846BF526A205F8
4BA2B6045BBF7E9A6A04675BB4@flbocexu05) about 'EN55022:1998 and telecom
ports' on Thu, 30 Jan 2003:
EN55022:1998 defines telecommunication ports as Ports which are intended
to be connected to telecommunications networks (e.g.
I read in !emc-pstc that Peter L. Tarver peter.tar...@sanmina-sci.com
wrote (in nebbkemlgllmjofmoplekehbedaa.peter.tar...@sanmina-sci.com)
about 'Circuit Breaker Tripping Dring Fault Tests' on Thu, 30 Jan 2003:
John -
That impedance value is suprisingly high,
It applies to 230 V 50 Hz
I read in !emc-pstc that boconn...@t-yuden.com wrote (in F7E9180F6F7F58
40858d3db815e4f7ad1f2...@cms21.t-yuden.com) about 'single fault
conditions' on Wed, 29 Jan 2003:
The environment being considered is a switching power supply. The technique
that safety agencies use to simulate a SFC on a
I read in !emc-pstc that boconn...@t-yuden.com wrote (in F7E9180F6F7F58
40858d3db815e4f7ad1f2...@cms21.t-yuden.com) about 'single fault
conditions' on Thu, 30 Jan 2003:
I am also concerned that there are products on the market, tested in good
faith, that would be unsafe for a more
I read in !emc-pstc that Paul Chan ncc...@tuvps.com.hk wrote (in
006901c2c801$82c70a00$27086...@tuvglobal.com) about 'UK DTI applying
generic standard to test hair dryer for conformity' on Thu, 30 Jan 2003:
I have read a news regarding on 3 Sept 02, UK Department of Trade Industry
(DTI) applied
Here is the link to the Conformity magazine article: Magnetic Field
Calibration: Unwinding The Helmholtz Coil, by Isidor Straus
http://www.conformity.com/featurearticlesarchive.html#June%202002
I used the formulas in this article to design and build an active ELF loop
antenna.
Dave
Ghery -
Ethernet on coax (10Base2) is indeed multi-user. Calling Ethernet/FE on
twisted pair 'multi-user' ignores the fact each cable conect two and only
two units. Hub/switch ports receive the signal, then reconstitute the
signal before re-transmitting to the next unit.
With EN55022:1998
Paul,
Try this place. A good place to do business.
http://www.productsafet.com/pages/main.html
Scott Douglas
Senior Compliance Engineer
Narad Networks
515 Groton Road
Westford, MA 01886
phone: 978 589-1869
dougl...@naradnetworks.com
www.naradnetworks.com http://www.naradnetworks.com/
At
I can't help you with the regulations but I can clarify the usage of Beryllium
a bit. When Beryllium is added to copper it makes it very hard. It is used in
gaskets to make them springy. Stainless steel is a poor substitute because it
lacks both the electrical and thermal conductivity.
So far
Hello EMC/PSTC-list,
I have a question concerning Berylium Copper (BeCu). Even though this is
not a direct
EMC oriented question, it is or could be, indirectly, a serious problem in
the EMC shielding of our
products.
I have been asked if BeCu can still be used in Europe and the USA (and the
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