SIST EN 61935-2:2006
(Main)Testing of balanced communication cabling in accordance with standards series EN 50173 -- Part 2: Patch cords and work area cords
Testing of balanced communication cabling in accordance with standards series EN 50173 -- Part 2: Patch cords and work area cords
Provides methods to ensure compatibility of modular plug cords to be used in cabling according to PN-EN 50173-1:2004 and also provides test methods and associated requirements to demonstrate the performance and reliability of these cords during their operational lifetime.
Prüfung der symmetrischen Kommunikationsverkabelung nach der Normenreihe EN 50173 -- Teil 2: Rangierschnüre und Geräteanschlussschnüre
Essais de câblages de télécommunications symétriques selon la série de normes EN 50173 -- Partie 2: Cordons de brassage et cordons de zone de travail
fournit des méthodes pour s'assurer de la compatibilité des cordons à fiches modulaires à utiliser dans les câblages selon l'ISO/IEC 11801 ainsi que des méthodes d'essai et leurs exigences associées pour démontrer les performances et la fiabilité de ces cordons au cours de leur durée de vie opérationnelle.
Preskušanje urejenega kabliranja za komunikacije v skladu s standardom EN 50173 – 2. del: Povezovalne vrvice in vrvice za delovna območja (EN 61935-2:2005)
General Information
Relations
Standards Content (Sample)
SLOVENSKI SIST EN 61935-2:2006
STANDARD
marec 2006
Preskušanje urejenega kabliranja za komunikacije v skladu s standardom EN
50173 – 2. del: Povezovalne vrvice in vrvice za delovna območja (EN 61935-
2:2005)
Testing of balanced communication cabling in accordance with standards series
EN 50173 - Part 2: Patch cords and work area cords (EN 61935-2:2005)
ICS 33.120.10 Referenčna številka
SIST EN 61935-2:2006(en)
© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno
---------------------- Page: 1 ----------------------
EUROPEAN STANDARD EN 61935-2
NORME EUROPÉENNE
EUROPÄISCHE NORM December 2005
ICS 33.04.20; 33.120.20 Supersedes EN 61935-2:2003
Incorporates Corrigendum December 2005
English version
Testing of balanced communication cabling in accordance
with standards series EN 50173
Part 2: Patch cords and work area cords
(IEC 61935-2:2005)
Essais de câblages Prüfung der symmetrischen
de télécommunications symétriques Kommunikationsverkabelung
selon la série de normes EN 50173 nach der Normenreihe EN 50173
Partie 2: Cordons de brassage et cordons Teil 2: Rangierschnüre und
de zone de travail Geräteanschlussschnüre
(CEI 61935-2:2005) (IEC 61935-2:2005)
This European Standard was approved by CENELEC on 2005-10-01. 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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,
Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61935-2:2005 E
---------------------- Page: 2 ----------------------
EN 61935-2:2005 - 2 -
Foreword
The text of document 46A/726/FDIS, future edition 2 of IEC 61935-2, prepared by SC 46A, Coaxial
cables, of IEC TC 46, Cables, wires, waveguides, R.F. connectors, R.F. and microwave passive
components and accessories, was submitted to the IEC-CENELEC parallel vote and was approved by
CENELEC as EN 61935-2 on 2005-10-01.
This European Standard supersedes EN 61935-2:2003 + corrigendum September 2003.
Significant technical changes with respect to EN 61935-2:2003 include requirements for NEXT.
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) 2006-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2008-10-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61935-2:2005 was approved by CENELEC as a European
Standard without any modification.
__________
---------------------- Page: 3 ----------------------
- 3 - EN 61935-2:2005
Corrigendum to EN 61935-2:2005
Title page
Replace "ISO/IEC 11801" by "standards series EN 50173".
General
Replace all other occurrences of "ISO/IEC 11801" by "EN 50173".
This replacement is to be made in the introduction and in Subclauses 4.1, 5.6.5 and 5.7.5 (Note).
Replace all occurrences of "IEC 61935-1" by "EN 61935-1".
This replacement is to be made in (sub)clauses 3, 4.3 (three times), 5.3, 5.4, 5.5, 5.6.3, 5.7.3 and
5.7.5.
Clause 1, Scope
Replace the text by:
This part of EN 61935 provides methods to ensure compatibility of modular plug cords to be used in
cabling according to EN 50173 and provides test methods and associated requirements to
demonstrate the performance and reliability of these cords during their operational lifetime.
Clause 2, Normative references
Replace the references to IEC 61935-1 and ISO/IEC 11801 by:
EN 61935-1:2005, Generic cabling systems - Specification for the testing of balanced communication
cabling in accordance with standards series EN 50173 – Part 1: Installed cabling (IEC 61935-1:2005,
mod.)
EN 50173, series, Information technology - Generic cabling systems
__________
---------------------- Page: 4 ----------------------
EN 61935-2:2005 - 4 -
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 Where an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
– – Information technology - Generic cabling EN 50173 Series
systems
1) 2)
IEC 60068-2-61 – Environmental testing EN 60068-2-61 1993
Part 2: Test methods - Test Z/ABDM:
Climatic sequence
IEC 60603-7 Series Connectors for electronic equipment EN 60603-7 Series
Part 7: Detail specification for connectors,
8-way, including fixed and free
connectors with common mating features,
with assessed quality
1) 2)
IEC 61076-3-104 - Connectors for electronic equipment EN 61076-3-104 2003
Part 3-104: Rectangular connectors -
Detail specification for 8-way, shielded
free and fixed connectors for data
transmissions with frequencies up to
600 MHz minimum
IEC 61156 Series Multicore and symmetrical pair/quad - -
cables for digital communications
1) 2)
IEC 61935-1 - Testing of balanced communication EN 61935-1 2005
(mod) cabling in accordance with standards
series EN 50173
Part 1: Installed cabling
1)
Undated reference.
2)
Valid edition at date of issue.
---------------------- Page: 5 ----------------------
NORME CEI
INTERNATIONALE
IEC
61935-2
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2005-09
Essais de câblages de télécommunications
symétriques selon l'ISO/IEC 11801 –
Partie 2:
Cordons de brassage et cordons
de zone de travail
Testing of balanced communication cabling
in accordance with ISO/IEC 11801 –
Part 2:
Patch cords and work area cords
IEC 2005 Droits de reproduction réservés Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
CODE PRIX
S
PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue
---------------------- Page: 6 ----------------------
61935-2 IEC:2005 – 3 –
CONTENTS
FOREWORD.7
INTRODUCTION.11
1 Scope.13
2 Normative references .13
3 Terms and definitions .13
4 General requirements and test configuration .15
4.1 Cable and connector design .15
4.2 Cable assembly, cable and connector tests .15
4.3 Test configuration and equipment.15
4.4 Modular plug-cord test requirements .19
5 Acceptance tests .21
5.1 Visual inspection .21
5.2 Wire map.21
5.3 Propagation delay .23
5.4 Delay skew.23
5.5 Insertion loss.23
5.6 Return loss.23
5.7 Near end crosstalk (NEXT).25
6 Periodic tests .27
6.1 General .27
6.2 Tensile strength .27
6.3 Flexure.27
6.4 Bending.29
6.5 Twisting.31
6.6 Crushing .33
6.7 Dust test.35
6.8 Coupling attenuation .39
6.9 Climatic sequence .39
7 Test-head requirements.41
7.1 General .41
7.2 Minimum requirements for all test-head designs .41
7.3 Additional FEXT requirements for modular 8-pin compatible test heads.41
7.4 Additional return loss requirements for modular 8-pin compatible test heads .41
7.5 NEXT loss centring requirements for modular 8-pin compatible test heads .41
---------------------- Page: 7 ----------------------
61935-2 IEC:2005 – 5 –
Figure 1 – Transmission performance test configuration for patch cords for NEXT and
return loss .17
Figure 2 – Required test set-up (Cat.5, Cat.6, Cat.7, screened, unscreened) for patch
cords for NEXT and return loss .17
Figure 3 – Correct pairing .21
Figure 4 – Incorrect pairing .23
Figure 5 – Fixture for cable assembly flexure test .29
Figure 6 – Bending test: assembly in U shape .31
Figure 7 – Twisting test: assembly in U shape .33
Figure 8 – Fixture for cable crushing test .35
Figure 9 – Measuring device.39
Figure 10 – Centring of NEXT properties of the modular 8-pin test head .43
---------------------- Page: 8 ----------------------
61935-2 IEC:2005 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TESTING OF BALANCED COMMUNICATION CABLING
IN ACCORDANCE WITH ISO/IEC 11801 –
Part 2: Patch cords and work area cords
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 61935-2 has been prepared by subcommittee 46A: Coaxial cables,
of IEC technical committee 46: Cables, wires, waveguides, r.f. connectors, r.f. and microwave
passive components and accessories.
This second edition cancels and replaces the first edition published in 2003 and constitutes a
technical revision.
This edition includes the following significant technical changes with respect to the previous
edition: requirements for NEXT.
---------------------- Page: 9 ----------------------
61935-2 IEC:2005 – 9 –
The text of this standard is based on the following documents:
FDIS Report on voting
46A/726/FDIS 46A/763/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.
IEC 61935 consists of the following parts, under the general title Testing of balanced
communication cabling in accordance with ISO/IEC 11801:
Part 1: Installed cabling
Part 2: Patch cords and work area cords
The committee has decided that the contents of this publication 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: 10 ----------------------
61935-2 IEC:2005 – 11 –
INTRODUCTION
Modular plug cords are constructed for connecting equipment using modular connecting
hardware. It is known that connecting hardware performance is subject to influence by the
properties of the modular plug termination and, therefore, modular plug cords should be
tested to determine the quality of the assembly. Moreover, the performance of modular plug
cords may differ due to the performances of the separate components involved depending
upon the efficiency of the manufacturing procedure. Manufacturing procedures also have an
impact on the reliability of these cords. This part of IEC 61935 provides test methods to
ensure the compatibility of modular plug cords to be used in cabling according to ISO/IEC
11801. It also provides test methods and associated requirements to demonstrate the
performance and reliability of these cords during their operational lifetime.
---------------------- Page: 11 ----------------------
61935-2 IEC:2005 – 13 –
TESTING OF BALANCED COMMUNICATION CABLING
IN ACCORDANCE WITH ISO/IEC 11801 –
Part 2: Patch cords and work area cords
1 Scope
This part of IEC 61935 provides methods to ensure the compatibility of modular plug cords to
be used in cabling according to ISO/IEC 11801 and provides test methods and associated
requirements to demonstrate the performance and reliability of these cords during their
operational lifetime.
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 60068-2-61, Environmental testing – Part 2-61: Test methods – Test Z/ABDM: Climatic
sequence
IEC 60603-7 (all parts), Connectors for frequencies below 3 MHz for use with printed boards –
Part 7: Detail specification for connectors, 8-way, including fixed and free connectors with
common mating features, with assessed quality
IEC 61076-3-104: Connectors for electronic equipment – Part 3-104: Rectangular connectors
– Detail specification for 8-way shielded free and fixed connectors for data transmissions with
frequencies up to 600 MHz minimum
IEC 61156 (all parts) , Multicore and symmetrical pair/quad cables for digital communications
IEC 61935-1, Testing of balanced communication cabling in accordance with ISO/IEC 11801 –
Part 1: Installed cabling
IEC 62153-4-7 Metallic communication cable test methods – Part 4-7: Electro Magnetic
Compatibility (EMC) – Shielded screening attenuation test method for measuring the transfer
impedance Z and the screening attenuation a or the Coupling attenuation a of RF-
T s C
1
Connectors and Assemblies up to and above 3 GHz
ISO/IEC 11801, Information technology – Generic cabling for customer premises
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61935-1 apply.
—————————
1
To be published.
---------------------- Page: 12 ----------------------
61935-2 IEC:2005 – 15 –
4 General requirements and test configuration
4.1 Cable and connector design
The design of the cables and connectors should conform to the applicable parts of IEC 61156,
IEC 60603-7, and IEC 61076-3-104 respectively, as referred to ISO/IEC 11801.
4.2 Cable assembly, cable and connector tests
Cables and connectors used in cable assemblies should be tested separately in accordance
with IEC 61156-1 and IEC 60603-7 or IEC 61076-3-104 respectively, even if they are not
described in the IEC 61156-1 and IEC 60603-7 series or in IEC 61076-3-104. These
component tests do not need to be repeated on the cable assembly.
The acceptance tests described in this document have to be performed on cable assembly on
a lot-by-lot basis.
The periodic tests described in this document are type tests that have to be performed
according to the quality system of the manufacturer.
4.3 Test configuration and equipment
The reference measurement procedures that are described in this standard require the use of
a network analyser, coaxial interface cables, r.f. transformers (baluns), twisted pair (TP) test
leads and impedance matching terminations. Refer to IEC 61935-1 for requirements for test
equipment. The nominal impedance for the test set-up and the terminations is 100 Ω. The
same tests may be used for 120 Ω and 150 Ω patch cords, but the measurement methods
have not been evaluated for these nominal impedance values.
The test configuration includes terminating test heads at each end of the patch cord. For
NEXT and return loss, the test configuration is as shown in Figure 1. The terminals on the test
heads interface with the test equipment. Refer to IEC 61935-1 for detailed connection
diagrams. All wire pairs shall be terminated with differential and common-mode terminations
according to IEC 61935-1. Resistive type terminations are preferred.
---------------------- Page: 13 ----------------------
61935-2 IEC:2005 – 17 –
1
50 Ω
D
G
C
2
C
3
G
D
50 Ω
4
6
5
7
IEC 1532/05
Key
1 Test interface 4 Balun 7 Far-end test head
2 Network analyser 5 Modular cord under test
3 Near-end test head 6 Ground plane
Figure 1 – Transmission performance test configuration
for patch cords for NEXT and return loss
The test set-up shall comply with the category of the device under test, see Figure 2.
Test head
Patch cords Category 5 Category 6 Category 7
Screended Unscreened Screened Unscreened Screened
Cat. 5/screened X
Cat. 5/unscreened X
Cat. 6/screened X
Cat. 6/unscreened X
Cat. 7/screened X
IEC 1533/05
Figure 2 – Required test set-up (Cat.5, Cat.6, Cat.7, screened, unscreened)
for patch cords for NEXT and return loss
Out In
50 Ω
50 Ω
25 Ω 25 Ω
50 Ω
50 Ω
50 Ω 50 Ω
25 Ω 50 Ω 50 Ω
25 Ω
50 Ω 50 Ω
50 Ω
50 Ω
---------------------- Page: 14 ----------------------
61935-2 IEC:2005 – 19 –
4.4 Modular plug-cord test requirements
The test methods described in this specification characterize modular plug cords. For
certification purposes, the test schedule refers to these tests.
The patch-cord test requirements include tests that can be performed on each patch cord or
representative samples produced and tests that are only performed on representative
samples of patch cords. The sampling only tests (known as periodic tests) include:
• tensile strength;
• flexure;
• bending/twisting;
• crushing;
• dust test;
• climatic sequence;
• coupling attenuation.
The periodic tests are described in detail in Clause 6.
The tests that can be performed on each patch cord include (acceptance tests):
• visual inspection;
• wire map;
• pair-to-pair NEXT;
• return loss.
The following additional tests should be performed:
• insertion loss (attenuation);
• ELFEXT;
• propagation delay;
• delay skew;
• d.c. resistance;
• d.c. resistance unbalance.
The requirements to be verified on each patch cord are described in detail in Clause 5.
Category 7 patch cords with the backwards compatible plugs shall be tested in both the
category 6 and category 7 mode of operation.
---------------------- Page: 15 ----------------------
61935-2 IEC:2005 – 21 –
5 Acceptance tests
5.1 Visual inspection
Visual inspection of cords and work area cords is performed by observing with normal or
corrected vision, without any additional magnification, that:
• the condition, workmanship and finish are satisfactory;
• the marking, when specified in the relevant specification, is legible;
• mechanical damage is absent and there is no undesired movement or displacement of
parts;
• flaking of materials or finishes is absent;
• the length is as specified.
5.2 Wire map
A conductor map test is intended to verify correct pin termination at each end and to check for
installation connectivity errors. For each of the conductors in the cable, and the screen(s), if
any, the conductor map indicates
• continuity to the remote end;
• shorts between any two or more conductors/screen(s);
• transposed pairs;
• reversed pairs;
• split pairs;
• any other connection errors.
1 1
2 2
3 3
6 6
5 5
4 4
7 7
8 8
S S
IEC 1534/05
Figure 3 – Correct pairing
A reversed pair occurs when the polarity of one wire pair is reversed at one end of the link.
See Figure 4a for an illustration of a reversed pair.
NOTE 1 In English, also called a tip/ring reversal.
A transposed pair occurs when the two conductors in a wire pair are connected to the position
for a different pair at the remote connection. See Figure 4b for an illustration of transposed
pairs.
NOTE 2 Transposed pairs are sometimes referred to as crossed pairs.
Split pairs occur when pin to pin continuity is maintained but physical pairs are separated.
See Figure 4c for an illustration of split pairs.
---------------------- Page: 16 ----------------------
61935-2 IEC:2005 – 23 –
1 1 1 1 1 1
2 2 2 2 2 2
3 3 3 3 3 3
6 6 6 6 6 6
5 5 5 5 5 5
4 4 4 4 4 4
7 7 7 7 7 7
8 8 8 8 8 8
S S S S S S
a) b) c)
IEC 1535/05
Key
a) Reversed pair b) Transposed pairs c) Split pairs
Figure 4 – Incorrect pairing
Wire map tests shall report "Pass" if cabling is determined to be correct.
5.3 Propagation delay
Propagation delay shall be measured in accordance with 4.6 of IEC 61935-1.
5.4 Delay skew
Delay skew shall be measured in accordance with 4.6 of IEC 61935-1.
5.5 Insertion loss
Insertion loss shall be measured in accordance with 4.5 of IEC 61935-1.
5.6 Return loss
5.6.1 Object
The object of this test is to measure the return loss of a cord (i.e. a flexible cable with two
attached connectors).
5.6.2 Test method
Return loss is derived from the measured value of the scattering parameter, S or S , of the
11 22
cord.
5.6.3 Test set-up
The test set-up is as shown in Figure 1. The test set-up consists of a network analyser, four
baluns as defined in 4.2.6 of IEC 61935-1, and two reference jacks.
5.6.3.1 Measurement
The cord shall be connected to the baluns through the reference jacks.
---------------------- Page: 17 ----------------------
61935-2 IEC:2005 – 25 –
5.6.4 Test report
The results measured shall be reported in graphical or table format with the limits specified in
the standard distinctly shown on the graphs or in the table at the same frequencies as
specified in the relevant detail specification. Results for all pairs shall be reported. It shall be
explicitly noted if the results measured exceed the test limits.
5.6.5 Requirements
The measured return loss shall meet the requirements of ISO/IEC 11801, Table 47.
5.7 Near end crosstalk (NEXT)
5.7.1 Object
The object of this test is to measure the NEXT of a cord (i.e. a flexible cable with two attached
connectors).
5.7.2 Test method
NEXT is derived from the measured value of the scattering parameter of the cord, S or S
21 12,
as applicable.
5.7.3 Test set-up
The test set-up is as shown in Figure 1. The test set-up consists of a network analyser, four
baluns as defined in 4.2.6 of IEC 61935-1, and two referen
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.