Electromagnetic compatibility (EMC) -- Part 4-6: Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields

This part of IEC 61000 relates to the conducted immunity requirements of electrical and electronic equipment to electromagnetic disturbances coming from intended radio-frequency (RF) transmitters in the frequency range 9 kHz up to 80 MHz. Equipment not having at least one conducting cable (such as mains supply, signal line or earth connection) which can couple the equipment to the disturbing RF fields is excluded.

Elektromagnetische Verträglichkeit (EMV) – Teil 4-6: Prüf- und Messverfahren – Störfestigkeit gegen leitungsgeführte Störgrößen, induziert durch hochfrequente Felder

Compatibilité électromagnétique (CEM) -- Partie 4-6: Techniques d'essai et de mesure - Immunité aux perturbations conduites, induites par les champs radioélectriques

La CEI 61000-4-6:2008 se rapporte aux exigences relatives à l'immunité en conduction des équipements électriques et électroniques aux perturbations électromagnétiques provoquées par des émetteurs destinés à des radiofréquences (RF), dans la plage de fréquences de 9 kHz à 80 MHz. Les matériels n'ayant pas au moins un câble conducteur (tel que cordons d'alimentation, lignes de transmission de signaux ou connexions de mise à la terre) pouvant coupler les matériels aux champs RF perturbateurs ne sont pas concernés par cette norme. L'objet de la CEI 61000-4-6:2008 est d'établir une référence commune dans le but d'évaluer l'immunité fonctionnelle des matériels électriques et électroniques, quand ils sont soumis aux perturbations conduites induites par les champs radiofréquence. La méthode d'essai documentée dans cette partie de la CEI 61000, décrit une méthode cohérente dans le but d'évaluer l'immunité d'un matériel ou d'un système vis-à-vis d'un phénomène défini. La CEI 61000-4-6:2008 a le statut de publication fondamentale en CEM en accord avec le Guide 107 de la CEI. Cette troisième édition de la CEI 61000-4-6 annule et remplace la deuxième édition parue en 2003, l'Amendement 1 (2004) et l'Amendement 2 (2006). Cette édition constitue une révision technique.  NEW! La CEI 61000-4-6:2008 est également disponible sous forme de IEC Standards+ 61000-4-6:2008 qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.

Elektromagnetna združljivost (EMC) - 4-6. del: Preskusne in merilne tehnike - Odpornost proti motnjam po vodnikih, ki jih inducirajo radiofrekvenčna polja (IEC 61000-4-6:2008)

General Information

Status
Withdrawn
Publication Date
18-Aug-2009
Withdrawal Date
28-Feb-2019
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
28-Feb-2019
Due Date
23-Mar-2019
Completion Date
01-Mar-2019

Relations

Buy Standard

Standard
EN 61000-4-6:2009
English language
59 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 61000-4-6:2009
01-september-2009
(OHNWURPDJQHWQD]GUXåOMLYRVW (0& GHO3UHVNXVQHLQPHULOQHWHKQLNH
2GSRUQRVWSURWLPRWQMDPSRYRGQLNLKNLMLKLQGXFLUDMRUDGLRIUHNYHQþQDSROMD ,(&

Electromagnetic compatibility (EMC) -- Part 4-6: Testing and measurement techniques -
Immunity to conducted disturbances, induced by radio-frequency fields
Elektromagnetische Verträglichkeit (EMV) – Teil 4-6: Prüf- und Messverfahren –
Störfestigkeit gegen leitungsgeführte Störgrößen, induziert durch hochfrequente Felder
Compatibilité électromagnétique (CEM) -- Partie 4-6: Techniques d'essai et de mesure -
Immunité aux perturbations conduites, induites par les champs radioélectriques
Ta slovenski standard je istoveten z: EN 61000-4-6:2009
ICS:
33.100.20 Imunost Immunity
SIST EN 61000-4-6:2009 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------

SIST EN 61000-4-6:2009

---------------------- Page: 2 ----------------------

SIST EN 61000-4-6:2009

EUROPEAN STANDARD
EN 61000-4-6

NORME EUROPÉENNE
March 2009
EUROPÄISCHE NORM

ICS 33.100.20 Supersedes EN 61000-4-6:2007 + IS1:2009


English version


Electromagnetic compatibility (EMC) -
Part 4-6: Testing and measurement techniques -
Immunity to conducted disturbances, induced by radio-frequency fields
(IEC 61000-4-6:2008)


Compatibilité électromagnétique (CEM) - Elektromagnetische Verträglichkeit (EMV) -
Partie 4-6: Techniques d'essai Teil 4-6: Prüf- und Messverfahren -
et de mesure - Störfestigkeit gegen leitungsgeführte
Immunité aux perturbations conduites, Störgrößen, induziert
induites par les champs radioélectriques durch hochfrequente Felder
(CEI 61000-4-6:2008) (IEC 61000-4-6:2008)




This European Standard was approved by CENELEC on 2009-03-01. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: avenue Marnix 17, B - 1000 Brussels


© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61000-4-6:2009 E

---------------------- Page: 3 ----------------------

SIST EN 61000-4-6:2009
EN 61000-4-6:2009 - 2 -
Foreword
The text of document 77B/571/FDIS, future edition 3 of IEC 61000-4-6, prepared by SC 77B, High
frequency phenomena, of IEC TC 77, Electromagnetic compatibility, was submitted to the IEC-CENELEC
parallel vote and was approved by CENELEC as EN 61000-4-6 on 2009-03-01.
This European Standard supersedes EN 61000-4-6:2007 + corrigendum August 2007 + IS1:2009.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2009-12-01
– latest date by which the national standards conflicting
(dow) 2012-03-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61000-4-6:2008 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 61000-4-3 NOTE  Harmonized as EN 61000-4-3:2006 (not modified).
CISPR 16-1-2 NOTE  Harmonized as EN 55016-1-2:2004 (not modified).
CISPR 20 NOTE  Harmonized as EN 55020:2007 (not modified).
__________

---------------------- Page: 4 ----------------------

SIST EN 61000-4-6:2009
- 3 - EN 61000-4-6:2009
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

1)
IEC 60050-161 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 161: Electromagnetic compatibility




1)
Undated reference.

---------------------- Page: 5 ----------------------

SIST EN 61000-4-6:2009

---------------------- Page: 6 ----------------------

SIST EN 61000-4-6:2009
IEC 61000-4-6
Edition 3.0 2008-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
BASIC EMC PUBLICATION
PUBLICATION FONDAMENTALE EN CEM
Electromagnetic compatibility (EMC) –
Part 4-6: Testing and measurement techniques – Immunity to conducted
disturbances, induced by radio-frequency fields

Compatibilité électromagnétique (CEM) –
Partie 4-6: Techniques d'essai et de mesure – Immunité aux perturbations
conduites, induites par les champs radioélectriques

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XA
CODE PRIX
ICS 33.100.20 ISBN 2-8318-1004-4
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 7 ----------------------

SIST EN 61000-4-6:2009
– 2 – 61000-4-6 © IEC:2008
CONTENTS
FOREWORD.5
INTRODUCTION.7
1 Scope and object .8
2 Normative references.8
3 Terms and definitions .8
4 General .10
5 Test levels .10
6 Test equipment.11
6.1 Test generator .11
6.2 Coupling and decoupling devices .12
6.2.1 Coupling/decoupling networks (CDNs) .12
6.2.2 Clamp injection devices .13
6.2.3 Direct injection devices .14
6.2.4 Decoupling networks.14
6.3 Verification of the common mode impedance at the EUT port of coupling and
decoupling devices .14
6.3.1 Insertion loss of the 150 Ω to 50 Ω adapters.15
6.4 Setting of the test generator.15
6.4.1 Setting of the output level at the EUT port of the coupling device.15
7 Test set-up for table-top and floor-standing equipment .16
7.1 Rules for selecting injection methods and test points.16
7.1.1 Injection method .16
7.1.2 Ports to be tested .17
7.2 Procedure for CDN injection application .18
7.3 Procedure for clamp injection when the common-mode impedance
requirements can be met .18
7.4 Procedure for clamp injection when the common-mode impedance

requirements cannot be met .19
7.5 Procedure for direct injection .19
7.6 EUT comprising a single unit .19
7.7 EUT comprising several units.20
8 Test procedure .20
9 Evaluation of the test results .21
10 Test report.21
Annex A (normative) Additional information regarding clamp injection.33
Annex B (informative) Selection criteria for the frequency range of application .38
Annex C (informative) Guide for selecting test levels .40
Annex D (informative) Information on coupling and decoupling networks.41
Annex E (informative) Information for the test generator specification .45
Annex F (informative) Test set-up for large EUTs .46
Annex G (informative) Measurement uncertainty of test instrumentation.49
Bibliography .56

Figure 1 – Rules for selecting the injection method .17

---------------------- Page: 8 ----------------------

SIST EN 61000-4-6:2009
61000-4-6 © IEC:2008 – 3 –
Figure 2 – Immunity test to RF conducted disturbances .23
Figure 3 – Test generator set-up .24
Figure 4 – Open circuit waveforms at the EUT port of a coupling device for test level 1.24
Figure 5 – Principle of coupling and decoupling .27
Figure 6 – Principle of coupling and decoupling according to the clamp injection method .27
Figure 7 – Details of set-ups and components to verify the essential characteristics of
coupling and decoupling devices and the 150 Ω to 50 Ω adapters .29
Figure 8 – Set-up for level setting (see 6.4.1) .30
Figure 9 – Example of test set-up with a single unit EUT.31
Figure 10 – Example of a test set-up with a multi-unit EUT .32
Figure A.1 – Circuit for level setting set-up in a 50 Ω test Jig .34
Figure A.2 – The 50 Ω test jig construction .34
Figure A.3 – Construction details of the EM clamp.35
Figure A.4 – Concept of the EM clamp (electromagnetic clamp).36
Figure A.5 – Coupling factor of the EM clamp .36
Figure A.6 – General principle of a test set-up using injection clamps .37
Figure A.7 – Example of the test unit locations on the ground plane when using
injection clamps (top view) .37
Figure B.1 – Start frequency as function of cable length and equipment size.39
Figure D.1 – Example of a simplified diagram for the circuit of CDN-S1 used with
screened cables (see 6.2.1) .42
Figure D.2 – Example of simplified diagram for the circuit of CDN-M1/-M2/-M3 used
42
with unscreened supply (mains) lines (see 6.2.1.1) .
Figure D.3 – Example of a simplified diagram for the circuit of CDN-AF2 used with
unscreened non-balanced lines (see 6.2.1.3).43
Figure D.4 – Example of a simplified diagram for the circuit of a CDN-T2, used with an
unscreened balanced pair (see 6.2.1.2) .43
Figure D.5 – Example of a simplified diagram of the circuit of a CDN-T4 used with
unscreened balanced pairs (see 6.2.1.2) .44
Figure D.6 – Example of a simplified diagram of the circuit of a CDN-T8 used with
unscreened balanced pairs (see 6.2.1.2) .44
Figure F.1 – Example of large EUT test set-up with elevated horizontal ground reference
plane .47
Figure F.2 – Example of large EUT test set-up with vertical ground reference plane.48
Figure G.1 – Example of influences upon the test method using CDN .49
Figure G.2 – Example of influences upon the test method using EM clamp .50
Figure G.3 – Example of influences upon the test method using current clamp.50
Figure G.4 – Example of influences upon the test method using direct injection .50

Table 1 – Test levels .11
Table 2 – Characteristics of the test generator.12
Table 3 – Main parameter of the combination of the coupling and decoupling device.12
Table B.1 – Main parameter of the combination of the coupling and decoupling device
38
when the frequency range of test is extended above 80 MHz .
Table E.1 – Required power amplifier output power to obtain a test level of 10 V .45
Table G.1a – CDN calibration process.51

---------------------- Page: 9 ----------------------

SIST EN 61000-4-6:2009
– 4 – 61000-4-6 © IEC:2008
Table G.1b – CDN test process .51
Table G.2a – EM clamp calibration process .53
Table G.2b – EM clamp test process .53
Table G.3a – Current clamp calibration process.54
Table G.3b – Current clamp test process.54
Table G.4a – Direct injection calibration process .55
Table G.4b – Direct injection test process.55

---------------------- Page: 10 ----------------------

SIST EN 61000-4-6:2009
61000-4-6 © IEC:2008 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 4-6: Testing and measurement techniques –
Immunity to conducted disturbances,
induced by radio-frequency fields


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61000-4-6 has been prepared by subcommittee 77B: High-
frequency phenomena, of IEC technical committee 77: Electromagnetic compatibility.
This standard forms part 4-6 of IEC 61000. It has the status of a basic EMC publication in
accordance with IEC Guide 107, Electromagnetic compatibility – Guide to the drafting of
electromagnetic compatibility publications.
This third edition of IEC 61000-4-6 cancels and replaces the second edition published in 2003,
Amendment 1 (2004) and Amendment 2 (2006).This edition constitutes a technical revision.
The document 77B/571/FDIS, circulated to the National Committees as Amendment 3, led to
the publication of the new edition.

---------------------- Page: 11 ----------------------

SIST EN 61000-4-6:2009
– 6 – 61000-4-6 © IEC:2008
The text of this standard is based on the second edition, its Amendment 1, Amendment 2 and
on the following documents:
FDIS Report on voting
77B/571/FDIS 77B/577/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

---------------------- Page: 12 ----------------------

SIST EN 61000-4-6:2009
61000-4-6 © IEC:2008 – 7 –
INTRODUCTION
IEC 61000 is published in separate parts according to the following structure:
Part 1: General
General considerations (introduction, fundamental principles)
Definitions, terminology
Part 2: Environment
Description of the environment
Classification of the environment
Compatibility levels
Part 3: Limits
Emission limits
Immunity limits (in so far as they do not fall under the responsibility of the product
committees)
Part 4: Testing and measurement techniques
Measurement techniques
Testing techniques
Part 5: Installation and mitigation guidelines
Installation guidelines
Mitigation methods and devices
Part 6: Generic standards
Part 9: Miscellaneous
Each part is further subdivided into several parts, published either as international standards or
as technical specifications or technical reports, some of which have already been published as
sections. Others will be published with the part number followed by a dash and a second
number identifying the subdivision (example : 61000-6-1).
This part is an international standard which gives immunity requirements and test procedure
related to conducted disturbances induced by radio-frequency fields.

---------------------- Page: 13 ----------------------

SIST EN 61000-4-6:2009
– 8 – 61000-4-6 © IEC:2008
ELECTROMAGNETIC COMPATIBILITY (EMC) –

Part 4-6: Testing and measurement techniques –
Immunity to conducted disturbances,
induced by radio-frequency fields



1 Scope and object
This part of IEC 61000 relates to the conducted immunity requirements of electrical and
electronic equipment to electromagnetic disturbances coming from intended radio-frequency
(RF) transmitters in the frequency range 9 kHz up to 80 MHz. Equipment not having at least
one conducting cable (such as mains supply, signal line or earth connection) which can couple
the equipment to the disturbing RF fields is excluded.
NOTE 1 Test methods are defined in this part for measuring the effect that conducted disturbing signals, induced
by electromagnetic radiation, have on the equipment concerned. The simulation and measurement of these
conducted disturbances are not adequately exact for the quantitative determination of effects. The test methods
defined are structured for the primary objective of establishing adequate repeatability of results at various facilities
for quantitative analysis of effects.
The object of this standard is to establish a common reference for evaluating the functional
immunity of electrical and electronic equipment when subjected to conducted disturbances
induced by radio-frequency fields. The test method documented in this part of IEC 61000
describes a consistent method to assess the immunity of an equipment or system against a
defined phenomenon.
NOTE 2 As described in IEC Guide 107, this standard is a basic EMC publication for use by product committees of
the IEC. As also stated in Guide 107, the IEC product committees are responsible for determining whether this
immunity test standard should be applied or not, and if applied, they are responsible for determining the appropriate
test levels and performance criteria. TC 77 and its sub-committees are prepared to co-operate with product
committees in the evaluation of the value of particular immunity tests for their products.
2 Normative references
The following referenced documents are indispensable for the application of this document. For
dated references, only the edition cited applies. For undated references, the latest edition of
the referenced document (including any amendments) applies.
IEC 60050-161, International Electrotechnical Vocabulary (IEV) – Chapter 161: Electro-
magnetic compatibility
3 Terms and definitions
For the purposes of this part of IEC 61000, the terms and definitions given in IEC 60050-161 as
well as the following definitions apply.
3.1
artificial hand
electrical network simulating the impedance of the human body under average operational
conditions between a hand-held electrical appliance and earth
[IEV 161-04-27]
NOTE The construction should be in accordance with CISPR 16-1-2.

---------------------- Page: 14 ----------------------

SIST EN 61000-4-6:2009
61000-4-6 © IEC:2008 – 9 –
3.2
auxiliary equipment
AE
equipment necessary to provide the equipment under test (EUT) with the signals required for
normal operation and equipment to verify the performance of the EUT
3.3
clamp injection
clamp injection is obtained by means of a clamp-on “current” injecting device on the cable:
– current clamp: a transformer, the secondary winding of which consists of the cable into
which the injection is made;
– electromagnetic clamp (EM clamp): injection device with combined capacitive and
inductive coupling
3.4
common-mode impedance
ratio of the common mode voltage and the common-mode current at a certain port
NOTE This common mode impedance can be determined by applying a unity common mode voltage between the
terminal(s) or screen of that port and a reference plane (point). The resulting common mode current is then
measured as the vectorial sum of all currents flowing through these terminal(s) or screen (see also Figures 8a and
8b).
3.5
coupling factor
ratio given by the open-circuit voltage (e.m.f.) obtained at the EUT port of the coupling (and
decoupling) device divided by the open-circuit voltage obtained at the output of the test
generator
3.6
coupling network
electrical circuit for transferring energy from one circuit to another with a defined impedance
NOTE Coupling and decoupling devices can be integrated into one box (coupling and decoupling network (CDN))
or they can be in separate networks.
3.7
coupling/decoupling network
CDN
electrical circuit incorporating the functions of both the coupling and decoupling networks
3.8
decoupling network
electrical circuit for preventing test signals applied to the EUT from affecting other devices,
equipment or systems that are not under test
3.9
test generator
generator (RF generator, modulation source, attenuators, broadband power amplifier and
filters) capable of generating the required test signal (see Figure 3)
3.10
electromotive force
e.m.f.
voltage at the terminals of the ideal voltage source in the representation of an active element
[IEV 131-01-38:1978]

---------------------- Page: 15 ----------------------

SIST EN 61000-4-6:2009
– 10 – 61000-4-6 © IEC:2008
3.11
measurement result
U
mr
voltage reading of the measurement equipment
3.12
voltage standing wave ratio
VSWR
ratio of a maximum to an adjacent minimum voltage magnitude along the line
4 General
The source of disturbance covered by this part of IEC 61000 is basically an electromagnetic
field, coming from intended RF transmitters, that may act on the whole length of cables
connected to installed equipment. The dimensions of the disturbed equipment, mostly a sub-
part of a larger system, are assumed to be small compared with the wavelengths involved. The
in-going and outgoing leads (e.g. mains, communication lines, interface cables) behave as
passive receiving antenna networks because of their length, which can be several wavelengths.
Between those cable networks, the susceptible equipment is exposed to currents flowing
“through"
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.