Two EMC issues were discussed how to populate rack for radiated emission
test and correlation of radiated emission tests at different test distances.
For some EUTs there are too many possible mix and match configurations, with
different or same modules, that testing all of them in order to
Paul,
For a pre compliance test:
* use your spectrum analyzer and antennas;
* loan or rent if you don't have them, or
* ask local lab for a hand.
For a final EMC compliance testing in TN, you could use NVLAP accredited
lab:
Philips Testing Service
One Philips Drive, P.O. Box
Marvin,
Your generator would be an excellent, handy tool to
periodically verify radiated test site integrity up to 10 GHz.
Is there a chance to make it commercially available?
Mirko Matejic
---
This message is from the IEEE EMC Society Product
Raymond,
At the enclosed web site, click on Mutual Recognition
Agreements then APLAC where is a document signed back in 1998.
http://ts.nist.gov/ts/htdocs/210/214/214.htm
http://ts.nist.gov/ts/htdocs/210/214/214.htm
Mirko
-Original Message-
From: raymond...@dixonsasia.com.hk
Theoretical explanation of how variable clock frequency reduces radiated
emission levels is given in US Patent 5,430,392
/netacgi/nph-Parser?Sect1=PTO1Sect2=HITOFFd=PALLp=1u=/netahtml/srchnum.
htmr=1f=Gl=50s1='5,430,392'.WKU.OS=PN/5,430,392RS=PN/5,430,392 Clock
system and method for reducing the
I don't think we should split EMC and Safety distribution lists.
We could refrain from posting humorous and similar messages unrelated to
EMC and Safety.
Mirko
---
This message is from the IEEE EMC Society Product Safety
Technical Committee emc-pstc
Method I used to identify culprit poles was to drive a car along the
street with AM radio on, tuned at frequency without a signal. Noise
from the radio was much louder near culprit poles.
A phone call to the power company with a list of culprit pole numbers
led up to the solution.
Mirko
David,
You might still have fighting chance to generate satisfactory field
uniformity in the semianechoic room over the area appropriate to the size of
your product. For products smaller than 5ft x 5ft, you can use lesser number
of points to determine field uniformity. If you do so, you can
Richard,
It was correlation between two OATS' at opposite sides of Atlantic.
Correlation
for a desktop PC size product with cables and peripherals was within couple
dB.
Correlation factors needed frequent updates and program was soon abolished.
Mirko Matejic
-
This message is
Barry,
Request was to measure radiated emission levels in compact semianechoic room
and predict measured levels at a specific OATS. In order to achieve this
goal I proposed to adjust room antenna factors, or to introduce correlation
correction factors for measurements in a room. Measurements in a
Richard,
You could improve correlation by adjusting chamber antenna factors for a
correlation differences which you can get from NSA measurements one at OATS
the other in the chamber with a fixed antenna height. You could also
determine correlation differences by comparing measured field
Derek,
Absorbing clamp for use in the frequency range 30 - 1000 MHz is described in
CISPR 16-1:1998, Section 13.
There were many attempts in CISPR SC G by Swiss and Swedish national
committees to introduce absorbing clamp as the alternative test method to
OATS for information technology
Bob,
Charles Zegers, Secretary of US National Committee/IEC,
tel: (212) 642-4936, e-mail: czeg...@ansi.org should be able to help you.
Mirko
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Dick,
You can download CFRs at no charge from:
http://www.fcc.gov/oet/info/rules/
Mirko
-
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with the single line: unsubscribe emc-pstc (without the
quotes). For help,
You must register on
http://astimage.daps.dla.mil/online/
to get the access to MIL-STDs
Mirko
-Original Message-
From: Matejic, Mirko
Sent: Tuesday, December 14, 1999 10:22
To: 'Jose Miguel Rio'; emc-p...@majordomo.ieee.org
Subject: RE: copper properties MIL-STD 461 462
Tania,
To open first web site and get standard in Russian language you'll need
Netscape Navigator.
http://www.espo.ru/techno/class.htm
The other web site with standard in Russian language could be opened with
either Netscape Navigator or MS Explorer.
Antonio,
Ignore near field probe calibration for a moment and focus on the real
H-field receiving system sensitivity and its signal to noise ratio. As you
correctly stated, magnetic component falls rapidly with a distance and low
magnetic field amplitude will present a practical problem at 5 to
In order to provide acceptable field uniformity for immunity
testing to radiated field, you need to eliminate, attenuate
or control reflections/standing waves. Ferrite tiles only on
parts of the shielded room floor, walls and ceiling could do
it, the question is to identify minimum tiled
Brian,
The other, bit lesser corporate exercise program you could
consider would be to roll-over GND plane over ferrite tiled
floor. GND plane could be chicken mesh grounded at etches.
Did you measure NSA with floor tiles in place?
Mirko
-Original Message-
From: Brian At Work
Derek,
Voltage probe is a very simple device comprising capacitor, resistor
and optional inductor. Description and circuit diagram are given in
CISPR Publication 16-1. If you need copy of relevant two pages,
please let me know. I would suggest to protect front end of your
analyzer by having
I'm sorry, my automatic spell checker did a terrible change,
waste should be vast. Mirko
-Original Message-
From: Matejic, Mirko [SMTP:mmate...@foxboro.com]
Sent: Monday, September 13, 1999 5:50
To: emc-p...@majordomo.ieee.org
Subject: RE: Just a reminder: Colorado Product
Dear EMC-PSTC Recipients:
In order to keep value of this valuable international
compliance distribution list, please refrain from
posting announcements/reminders of chapter
meetings with no interest to a waste majority of
recipients.
Message could be posted on a chapter web page
and/or
John,
Characteristics of average measuring receivers for
measuring disturbance levels in the range from
9 kHz to 1 GHz are given in CISPR Publication 16-1.
Limits for radiated disturbances above 1 GHz
are peak detector levels, the only detector to be
used for determining compliance above 1
Nezam,
New ISO9000 (-2000 ???) standards are not yet approved. I can send
you current committee drafts, but keep in mind that those are still DRAFTS.
Mirko Matejic
The Foxboro Company
-Original Message-
From: Nezam Najafi [SMTP:nezam.naj...@madge.com]
Sent: Friday, August 13, 1999
Hi Darrell,
I enclosed official response from DG3 to the same question from November
1998.
Manufacturer is responsible to draw up EC DoC and sign it as well,
regardless of residency.
Mirko Matejic
ENCLOSURE:
From: elena.santi...@dg3.cec.be
Sent: Friday, November 13, 1998 1:11 AM
To:
Brian,
Try Mini-Circuits, 800-654-7949, www.minicircuits.com/99c-108.pdf, DC-1500
MHz 1W attenuators are $16.95.
Mirko Matejic
-
This message is coming from the emc-pstc discussion list.
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with the single line: unsubscribe
I remember many discussions on different CISPR Subcommittees on
Swiss and Sweden's proposals and numerous papers presented on
EMC Symposia in eighties and early nineties to replace OATS with
absorbing clamp type measurements or to add clamp method as the
alternative. All these proposals were
APLAC Mutual Recognition Agreement MR002 (1997) is available at:
http://ts.nist.gov/ts/htdocs/210/214/214.htm
Further details including implementation schedule are available
from NVLAP and A2LA.
Mirko Matejic
-Original Message-
From: rehel...@mmm.com [SMTP:rehel...@mmm.com]
Sent:
Patrick,
CISPR 11, other CISPR Publications and FCC conducted emissions limits apply
to the EUT port.
LISN insertion loss should be added. In most cases, especially at higher
frequencies correction
for LISN's insertion loss is negligible to the overall test accuracy and
therefore could be
Does anyone have any information regarding EMC compliance
requirements for industrial control equipment in Martinique?
I would appreciate any lead you could give me.
Mirko Matejic
(508) 549-3185
-
This message is coming from the emc-pstc discussion list.
To cancel your subscription,
Richard,
At the page
http://europa.eu.int/comm/dg03/directs/dg3b/newapproa/eurstd/harmstds/reflis
t.html
http://europa.eu.int/comm/dg03/directs/dg3b/newapproa/eurstd/harmstds/refli
st.html
choose compliance area of interest and you'll get name and number of
official EC contact point.
Mirko
Derek,
As Art Wall told you, at this point FCC does not see enough justification to
enforce
compliance with EMC immunity standards. FCC might change their mind, don't
worry.
Procedure will require wide prior consultations with industry and end users.
Sometimes Europe is too organized, remember
Mike,
Enclosed is recent interpretation from DG3:
As a general rule, the manufacture must ... draw up EC declaration of
conformity. New Approach directives do not require the manufacturer to be
established in the Community.
Mirko Matejic
From: elena.santi...@dg3.cec.be
Sent: Friday,
Brian,
You could reduce calibration time by using commercially available software,
remote
controlled antenna polarization and field probe positioner.
Mirko Matejic
-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
Moshe,
Your question 2. indicates an operational problem at a
customer site which needs to be fixed.
There are many different ways to fix this particular
problem, you suggested few.
To be more specific, more information would be
Scott,
There is no requirement for a minimum passing margin built into FCC Part
15, CISPR 22 or EN 55022.
Minimum passing margin of 2 dB was mentioned in old, now obsolete VDE
EMC specifications. There is 2 dB rule in CISPR procedures to determine
representative configuration in a case of
Eric,
FYI, phrase or any other reason, delayed document approval and it
missed deadline for CISPR 11:1997-12 Third Edition. In my opinion delay
was well justified.
3 meter semi-anechoic chamber is acceptable if it complies with CISPR
Publications 11:1997-12 and 16-1:1993-08. In anticipation of
Development of international standard takes a time. Modification takes
even longer. CISPR approval criteria are at least 67% in favor and no
more than 25% against votes by participating National Committees.
CISPR Sub-Committee B developed Amendment to CISPR 11 to allow
measurement at a closer
ISO/DIS is available at:
http://web.ansi.org/reports/master.asp?room=22
http://web.ansi.org/reports/master.asp?room=22
-Original Message-
From: Matejic, Mirko [SMTP:mmate...@foxboro.com]
Sent: Wednesday, October 07, 1998 7:07 AM
Can somebody confirm information I picked on the radio that each Shuttle
launch causes a major damage in the Ozone layer?
Mirko Matejic
-
This message is coming from the emc-pstc discussion list.
To cancel your subscription, send mail to majord...@ieee.org
with the single line:
ISO/DIS 17025 is DRAFT industry standard which has been produced as the
result of extensive experience of the implementation of ISO/IEC Guide
25: 1990 and EN 4500l :1989 both of which it will replace. It contains
all of the requirements that testing and calibration laboratories have
to meet if
Bob,
Standard development committee documents are not copyrighted and
could be distributed freely. Aim is always to get inputs in the standard
development stage. It must be understood, that committee documents
are exactly that, they are not adopted standards and could not be
used for product
Muriel,
You asked for comments on your CONDUCTED emissions testing procedure in
a presence of ambient noise.
Provide clean ac power to LISN. Either have clean ac power generator
or insert 10 kHz low pass
filter between ac power line and LISN. In addition, add common mode
filter as already
I share John Kehs' position on the subject.
Topic is well within the scope of EMC-PSTC. Kate MacLean posted information
about the article
without any finger pointing.
Kate, we all appreciate your effort to bring it to the attention of this forum.
Mirko Matejic
-Original Message-
Hi Frank,
Antennas are characterized by either antenna factors or antenna gain.
Antenna factors are used for the reason of simplicity. Antenna gain is
an indicator of how much specific antenna is more efficient from the
isotropic radiator. To get actual field strength level we will need
antenna
Derek,
Try to lift all these 50 and 100pF caps from GND and connect
them directly to GND pin of the brain chip. Exercise could be tricky
with SMT. If there are more GND pins, use nearest to x-tal pins.
Sometimes there are resistors, two in series and one across x-tal,
but leave them for later.
Video camera in the original posted question was powered by 24 Vac.
I assume power supply would be step-down transformer, either wall
mounted or on a short power cord. Regardless of the source of 24 Vac,
if camera is going to be ultimately powered by the ac power line,
conducted emission should
Richard,
I agree with your understandings.
It would be risky and open to arguments if understood otherwise.
Mirko Matejic
The Foxboro Company
--
From: WOODS, RICHARD
To: 'EMC'
Subject: Conducted Emissions Test
List-Post: emc-pstc@listserv.ieee.org
Date: Tuesday, June 23, 1998 1:44PM
I would appreciate a hint where to get list of harmonized standards to
Directives 89/391 and 90/270, both addressing health and safety at
workplaces.
Regards,
Mirko Matejic
The Foxboro Company
Kaan,
I developed and proposed flow chart - Decision tree for peak detector
measurements, at least six years ago at U.S. National Committee for IEC
TAG for CISPR SC G. I presented the same document later that year in
Berlin to CISPR SC A and SC G on behalf of U.S. National Committees.
Proposal
Look for ANSI C63.5, telephone: 212.642.4900, http://www.ansi.org
Mirko Matejic
--
From: Bailin Ma
To: emc-p...@ieee.org
Subject: Antenna Factors of 3 Antennas
List-Post: emc-pstc@listserv.ieee.org
Date: Thursday, February 26, 1998 11:33AM
Hi,
Is anybody kind enough to give me a hint
Ideal correlation between GTEM and OATS is not expected. Few
years ago in a Public Notice FCC laid out conditions for accepting
final compliance data from GTEMs.
Mirko Matejic
The Foxboro Company
Foxboro, Massachusetts
Cortland,
My comment is to a Latin sentence which according to my
recollection should be:
Morituri te salutant, meaning they who will die are greeting you.
Gladiators greeted Imperior prior entering arena with lions.
Greetings,
Mirko
--
From: Cortland Richmond
To: TDonnelly; ieee
You are invited to the joint meeting of IEEE Boston Section EMC Chapter
and New England Product Safety Society will be held on Wednesday,
September 24, 7:00 PM, at EMC Corporation, 42 South Street, Hopkinton,
Massachusetts. Training by recognized expert in addition to refreshments
will be offered.
Richard,
You could check following sources:
Ms. Wang Suying
Chinese Standardization Institute
Senior Director of Department
P.O. Box 1101
Beijing, China
Tel: 4012382
if you want to call Ms. Wang Suying be prepared to communicate in
Chinese.
Mr. Gao Yougang
Chairman of China National
Hello Eric and Ryan,
First Korean EMC test laboratory has been accredited on June 30, 1997
by NVLAP, Lab Code: 200040-0 for testing emissions to FCC Part 15.
LG Electronics, Inc.
Quality and Reliability Center
36, Munlae-dong, 6-ga Youngdungpo-gu
Seoul 150-096
KOREA
Contact: Mr. Hong Do-Jae
Bill,
I found guidelines at:
http://www.open.gov.uk/radiocom/emc.htm
There is no date of release on it and annexes are not included.
Document is on 59 A4 pages. Page 60 is blank.
Please check if this is referenced official version.
Thanks,
Mirko
--
From: b...@lyons.demon.co.uk
To:
According to CISPR 16-1:1993, Section 5.3, the accuracy of measurement
of sine-wave voltages by receiver (aSA, dSA or receiver) shall be better
than +/- 2 dB. Therefore, deviation of measured value (sine-wave) with
two acceptable receivers, dSA or aSA could be up to 4dB. Deviation
could be over 4
standards, ONLY ONE is reference and takes precedence over
other acceptable alternatives in the case of a dispute. By the
way how CISPR 22 (EN 55022) was written, reference test
distances were given in Tables 3 and 4..
Regards,
Mirko Matejic
--
From: Rene Charton
To: Matejic, Mirko; emc-p
Eric,
You are right and this muddy point hopefully will be cleared.
CISPR SC B Interference from Industrial, Scientific and Medical
Radio Frequency Apparatus is preparing Annex to CISPR 11
which will allow testing class A equipment at 10 meters and
class B at 3 meters with 20*Log(D/d) limit
Robert,
Reference and therefore preferred test distance for measurements
to CISPR 22 is 10 meters for both classes A and B.
Measurements at closer distances, including 3 meters are acceptable.
In a case of dispute results from 10 meters will take precedence.
Mirko Matejic
Coauthor of CISPR 22,
Randy,
Could you summarize and post responses you received on your posting?
Thanks,
Mirko
Join us at Electronics Industries Forum, World Trade Exhibition
Center, Boston, Massachusetts, May 6-8
The EIF+97 Conference program has over 100 sessions organized
into five major Summits, among them Technology and International
Standards. Approximately 150 industry, government, and academic
Hi Bob,
Reference document for dipole antenna is CISPR 16-1:1993-08
Specification for radio disturbance and immunity measuring
apparatus and methods. Antennas, including shortened dipole
are defined in Section 15. Generic shorten dipole antenna
factors are on Figure 13. You should calibrate your
There is a relevant feature article Accreditation puts cal labs on
the spot in the April 1997 issue of Quality. On line article is
available
at URL:
http://qualitymag.com/0497fx.html
Mirko Matejic
My few years old info about Hungarian IEC Committee/ State standards
organization is:
Magyar Szabvanyugy Hivatal
Ulloi-ut 25
PF.24
H-1450 Budapest 9
Hungary
Tel: +36 1 118 30 11
Fax: +36 1 118 51 25
President: Dr. Laszlo Petrovai (Mr.)
Please post your findings. Thanks, Mirko
--
From:
Draft - New EMC European Guidelines is available at:
..
A copy of the new Commission Guidlines for EMC can be found at:-
http://www.emc-journal.co.uk/newguide.html
Webmaster
Nutwood UK Ltd
Mirko
Radiated field strength limits above 1 GHz are in the final stage of
approval
in all European and other International EMC bodies including all CISPR
Sub
Committees A to G, ETSI EE4, CENELEC TC 210, etc.
Proposed limits in different committees were supported by U.S. TAGs
(Technical Advisory
Vi Van,
There is no NVLAP accredited UK lab for FCC Part 15 it's my
understanding that the FCC is not now accepting the DoC based
on the test report from UK labs. Efforts are on the way to sign
Mutual Recognition Agreement between US and EC and
correct this situation.
Reasonably updated list of
IEEE EMC Society Central New England Chapter invites you to the
following meetings:
Tuesday, February 11, 6:30 p.m.
John Osburn, Austin, TX, Chair of 1997 IEEE EMC Symposium presenting
The GTEM!What Is It, Where Has It Been, Where is it Going?
In many cases GTEM! is the
Frank,
Michael Howard provides good calibration service, traceable to NIST,
with very competitive prices and 3-5 days turnaround time at:
Liberty Labs, Inc.
1346 Yellowwood Rd.
P.O. Box 230
Kimballton, IA 51543
Tel: (712) 773-2199, Fax: (712) 773-2299
Email: mhow...@netins.net
Homepage:
George,
IEC/ISO Guide 25 is the basis for ALL existing testing and calibration
laboratory accreditation programs in the world including NVLAP and A2LA
recognized by the FCC.
Need to express measurement accuracy was recognized long time ago. Many
experts are working together on national and
You are invited by IEEE EMC Society Central New England Chapter on 6:30
PM, Tuesday, February 11 to presentation
The GTEM!What Is it, Where Has It Been, Where is it Going?
John Osburn, EMC Test Systems, L. P., Austin, Texas
The GHz Transverse Electromagnetic Cell, or GTEM!, is a relatively
Hello Fred,
I recently assessed six EMC labs in Taiwan and all of them are in full
compliance with applicable IEC, CISPR, FCC and EN specifications
as well as with ISO Guide 25 General requirements for the competence
of calibration and testing laboratories. All of them provide highly
IEEE EMC Society Central New England Chapter invites you on
6:30 PM, Tuesday, December 10 presentation
Ground Plane Gaps, Common Mode Voltages and Radiated EMI in
Multi-Layer Printed Circuit Boards by
Lee Hill, EMC Consultant
Previous work in the EMC literature has demonstrated that the
Enclosed document is third part of Guidelines on the application
of EMC Directive in Word 6.0 for Windows published by EEC DGIII
in Brussels in April 1996.
Because of the size of file, it will be posted in three pieces.
Regards,
Mirko Matejic
The Foxboro Company
begin 644 GUIDE3.DOC
Brian,
You may contact specialized manufacturer in shielded,
transparent windows at:
IVC Displays Tel: (011) 44
1332 864-900
28-30 Derby RoadFax: (011) 44 1332
865-409
Melbourne, Derbyshire DE73 1FE
United Kingdom
Dear Fellow Compliance Colleague,
You are invited to the joint meeting of IEEE New England
Section EMC Chapter and Northeast Product Safety Society, Inc.
on Wednesday September 25, 1996 7:00p.m. featuring
presentation and follow up discussion:
A Close Look at the New EC Power Line Harmonics
Hello Joan,
There is a capable NVLAP accredited EMC test lab:
TUV Product Service , Inc,
40 Meadow Road-PWS
Lyons, CO 80540
Call Tim O'Shea, tel: (303) 449-4165, fax: (303) 449-3004
Manufacturer could test product themselves without involvement of third
party testing under the certain
Jerry,
Compliance Testing to the
IEC 1000-3-2 (EN 61000-3-2) and
IEC 1000-3-3 (EN 61000-3-3) Standards
HP Application Note 1273
56 pages, published in 1995 provides solid information on
testing power supplies to the requirements (harmonics and
fluctuations) and just touched design for
Brian,
EN 55022:1994, Clause 1 Scope and object reads:
Procedures are given for the measurement of the levels of spurious
signals generated by the ITE and limits are specified for the frequency
range 9 kHz to 400 GHz for both Class A and Class B equipment. No
measurements need be performed at
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