EN 60512-26-100:2008

SLOVENSKI STANDARD
01-december-2008
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Connectors for electronic equipment - Tests and measurements - Part 26-100:
Measurement setup, test and reference arrangements and measurements for connectors
according to IEC 60603-7 - Tests 26a to 26g (IEC 60512-26-100:2008)
Steckverbinder für elektronische Einrichtungen - Mess- und Prüfverfahren - Teil 26-100:
Messaufbau, Prüf- und Referenzanordnung und Messverfahren für Steckverbinder nach
IEC 60603 7 -Prüfungen 26a bis 26g (IEC 60512-26-100:2008)
Connecteurs pour équipements électroniques - Essais et mesures - Partie 26-100:
Montage de mesure, dispositifs d'essai et de référence et mesures pour les connecteurs
conformes à la CEI 60603-7 - Essais 26a à 26g (CEI 60512-26-100:2008)
Ta slovenski standard je istoveten z: EN 60512-26-100:2008
ICS:
31.220.10 9WLþLLQYWLþQLFHNRQHNWRUML Plug-and-socket devices.
Connectors
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60512-26-100
NORME EUROPÉENNE
October 2008
EUROPÄISCHE NORM
ICS 31.220.10
English version
Connectors for electronic equipment -
Tests and measurements -
Part 26-100: Measurement setup, test and reference arrangements
and measurements for connectors according to IEC 60603-7 -
Tests 26a to 26g
(IEC 60512-26-100:2008)
Connecteurs  Steckverbinder
pour équipements électroniques - für elektronische Einrichtungen -
Essais et mesures - Mess- und Prüfverfahren -
Partie 26-100: Montage de mesure, Teil 26-100: Messaufbau,
dispositifs d'essai et de référence Prüf- und Referenzanordnung
et mesures pour les connecteurs und Messverfahren für Steckverbinder
conformes à la CEI 60603-7 - nach IEC 60603-7 -
Essais 26a à 26g Prüfungen 26a bis 26g
(CEI 60512-26-100:2008) (IEC 60512-26-100:2008)

This European Standard was approved by CENELEC on 2008-10-01. 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, 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: rue de Stassart 35, B - 1050 Brussels

© 2008 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60512-26-100:2008 E

Foreword
The text of document 48B/1892/FDIS, future edition 1 of IEC 60512-26-100, prepared by SC 48B,
Connectors, of IEC TC 48, Electromechanical components and mechanical structures for electronic
equipment, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as
EN 60512-26-100 on 2008-10-01.
This European Standard cancels and replaces the annexes of EN 60603-7-x documents dealing with
transmission characteristics for interoperability and backward compatibility.
This standard is to be read in conjunction with EN 60512-1 and EN 60512-1-100 which explains the
structure of the EN 60512 series.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
(dop) 2009-07-01
national standard or by endorsement
– latest date by which the national standards conflicting
(dow) 2011-10-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60512-26-100:2008 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 60068-1 NOTE  Harmonized as EN 60068-1:1994 (not modified).
IEC 60512-25 NOTE  Harmonized in EN 60512-25 series (not modified).
__________
- 3 - EN 60512-26-100:2008
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 1  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
NOTE 2 Where a standard cited below belongs to the EN 50000 series, the European Standard applies instead of the relevant
International Standard.
Publication Year Title EN/HD Year

1)
- - Communication cables - EN 50289-1-14 -
Specifications for test methods -
Part 1-14: Electrical test methods - Coupling
attenuation or screening attenuation of
connecting hardware
1)
IEC 60169-15 - Radio-frequency connectors - - -
Part 15: R.F. coaxial connectors with inner
diameter of outer conductor 4,13 mm
(0,163 in) with screw coupling - Characteristic
impedance 50 ohms (Type SMA)
1) 2)
IEC 60512-1 - Connectors for electronic equipment - EN 60512-1 2001
Tests and measurements -
Part 1: General
1) 2)
IEC 60512-1-100 - Connectors for electronic equipment - EN 60512-1-100 2006
Tests and measurements -
Part 1-100: General - Applicable publications

1) 3)
IEC 60603-7 - Connectors for electronic equipment - EN 60603-7 200X
Part 7: Detail specification for 8-way,
unshielded, free and fixed connectors

1) 3)
IEC 60603-7-2 - Connectors for electronic equipment - EN 60603-7-2 200X
Part 7-2: Detail specification for 8-way,
unshielded, free and fixed connectors, for data
transmissions with frequencies up to 100 MHz

1) 3)
IEC 60603-7-3 - Connectors for electronic equipment - EN 60603-7-3 200X
Part 7-3: Detail specification for 8-way,
shielded, free and fixed connectors, for data
transmission with frequencies up to 100 MHz

IEC 60603-7-4 2005 Connectors for electronic equipment - EN 60603-7-4 2005
Part 7-4: Detail specification for 8-way,
unshielded, free and fixed connectors, for data
transmissions with frequencies up to 250 MHz

3)
IEC 60603-7-5 2007 Connectors for electronic equipment - EN 60603-7-5 200X
Part 7-5: Detail specification for 8-way,
shielded, free and fixed connectors, for data
transmissions with frequencies up to 250 MHz

1)
Undated reference.
2)
Valid edition at date of issue.
3)
To be ratified.
Publication Year Title EN/HD Year

IEC 61156 Series Multicore and symmetrical pair/quad cables - -
for digital communications
1) 2)
IEC 61169-16 - Radio-frequency connectors - EN 61169-16 2007
Part 16: Sectional specification - RF coaxial
connectors with inner diameter of outer
conductor 7 mm (0,276 in) with screw
coupling - Characteristics impedance 50 ohms
(75 ohms) (type N)
4)
ISO/IEC 11801 2002 Information technology - EN 50173-1 and 2007
5)
Generic cabling for customer premises EN 50173-2 2007

1)
ITU-T - Transmission aspects of unbalance - -
Recommendation about earth
G.117
1)
ITU-T - Measuring arrangements to assess - -
Recommendation the degree of unbalance about earth
O.9
4)
The title of EN 50173-1 is: Information technology - Generic cabling systems – Part 1: General requirements.
5)
The title of EN 50173-2 is: Information technology - Generic cabling systems – Part 2: Office premises.

IEC 60512-26-100
Edition 1.0 2008-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Connectors for electronic equipment – Tests and measurements –
Part 26-100: Measurement setup, test and reference arrangements and
measurements for connectors according to IEC 60603-7 – Tests 26a to 26g

Connecteurs pour équipements électroniques – Essais et mesures –
Partie 26-100: Montage de mesure, dispositifs d’essai et de référence et
mesures pour les connecteurs conformes à la CEI 60603-7 – Essais 26a à 26g

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XA
CODE PRIX
ICS 31.220.10 ISBN 2-8318-9892-7
– 2 – 60512-26-100 © IEC:2008
CONTENTS
FOREWORD.6
INTRODUCTION.8
1 Scope.9
2 Normative reference .9
3 General requirements for measurement setup .10
3.1 Test instrumentation.10
3.2 Coaxial cables and test leads for network analysers.10
3.3 Measurement precautions .10
3.4 Balun requirements .11
3.5 Reference components for calibrations.12
3.5.1 Reference loads for calibration .12
3.5.2 Reference cables for calibration .12
3.6 Termination loads for termination of conductor pairs .12
3.7 Termination of screens .13
3.8 Test specimen and reference planes .13
3.9 Termination of balun with low return loss for common mode .14
3.9.1 General .14
3.9.2 Centre tap connected to ground.14
3.9.3 Centre tap open.14
4 Connector measurement up to 250 MHz .15
4.1 Insertion loss (IL), Test 26a.15
4.1.1 Object .15
4.1.2 Free connector for insertion loss.15
4.1.3 Test method .15
4.1.4 Test set-up .15
4.1.5 Procedure.15
4.1.6 Test report.17
4.1.7 Accuracy .17
4.2 Return loss (RL), Test 26b .17
4.2.1 Object .17
4.2.2 Free connector for return loss.17
4.2.3 Test method .17
4.2.4 Test set-up .17
4.2.5 Procedure.17
4.2.6 Test report.17
4.2.7 Accuracy .17
4.3 Near-end crosstalk (NEXT), Test 26c .18
4.3.1 Object .18
4.3.2 Fixed and free connector combinations to be tested .18
4.3.3 Test method .18
4.3.4 Test set-up .18
4.3.5 Procedure.19
4.3.6 Test report.20
4.3.7 Accuracy .20
4.4 Far-end crosstalk (FEXT), Test 26d.20
4.4.1 Object .20

60512-26-100 © IEC:2008 – 3 –
4.4.2 Fixed and free connector combinations to be tested .20
4.4.3 Test method .20
4.4.4 Test set-up .20
4.4.5 Procedure.21
4.4.6 Test report.22
4.4.7 Accuracy .22
4.5 Transfer impedance (Z ), Test 26e .22
T
4.5.1 Object .22
4.5.2 Test method .22
4.5.3 Definitions .22
4.5.4 Test set-up .23
4.5.5 Procedure.26
4.5.6 Test report.27
4.5.7 Accuracy .27
4.6 Transverse Conversion Loss (TCL), Test 26f.28
4.6.1 Object .28
4.6.2 Test method .28
4.6.3 Test set-up .28
4.6.4 Procedure.28
4.6.5 Test report.29
4.6.6 Accuracy .29
4.7 Transverse Conversion Transfer Loss (TCTL), Test 26g.29
4.7.1 Object .29
4.7.2 Test method .29
4.7.3 Test set-up .30
4.7.4 Procedure.30
4.7.5 Test report.30
4.7.6 Accuracy .31
5 Construction and qualification of test plugs.31
5.1 De-embedding near-end crosstalk (NEXT) test plug .31
5.1.1 Set-up and calibration of reference plug .31
5.1.2 Test plug construction .32
5.1.3 Test plug NEXT measurement .33
5.1.4 Test plug NEXT requirements.34
5.1.5 Test plug balance .36
5.2 Far-end crosstalk (FEXT) test plug .37
5.2.1 General .37
5.2.2 Test plug FEXT measurement – de-embedding method .38
5.2.3 Test plug FEXT measurement – direct method .38
5.2.4 FEXT test plug requirements .39
5.3 Return loss test plug .39
6 Reference plug and jack construction and measurement – the basics of the de-
embedding test method .39
6.1 De-embedding near-end crosstalk (NEXT) reference plug and jack .39
6.1.1 Reference plug construction .39
6.1.2 Return loss reference plug.40
6.1.3 Set-up and calibration of reference plug .41
6.1.4 De-embedding reference plug NEXT measurement.41
6.1.5 Delay adjustment in lieu of port extension.41

– 4 – 60512-26-100 © IEC:2008
6.2 De-embedding near-end crosstalk (NEXT) reference jack.41
6.2.1 Reference jack construction.41
6.2.2 De-embedding reference jack NEXT measurement .43
6.2.3 Differential mode jack vector .43
6.3 Determining reference jack FEXT vector .43
6.3.1 FEXT reference plug details .43
6.3.2 FEXT reference jack assembly .46
6.3.3 De-embedding reference jack FEXT assembly measurement.47
Annex A (informative) Example test fixtures in support .48
Bibliography.54

Figure 1 – Optional 180° hybrid used instead of a balun .11
Figure 2 – Example of calibration of reference loads.12
Figure 3 – Resistor load.13
Figure 4 – Definition of reference planes.14
Figure 5 – Balanced attenuator for balun centre tap grounded .14
Figure 6 – Balanced attenuator for balun centre tap open .15
Figure 7 – Calibration .16
Figure 8 – Measuring set-up .16
Figure 9 – NEXT measurement for differential and common mode terminations .19
Figure 10 – FEXT measurement for differential and common mode terminations.21
Figure 11 – Preparation of test specimen.23
Figure 12 – Triaxial test set-up .24
Figure 13 – Impedance matching for R < 50 Ω .25
Figure 14 – Impedance matching for R > 50 Ω .26
Figure 15 – TCL measurement.28
Figure 16 – TCTL measurement.30
Figure 17 – Back-to-back through calibration (for more information see Annex A).31
Figure 18 – Mated test plug/direct fixture test configuration .38
Figure 19 – De-embedding reference plug .40
Figure 20 – De-embedding reference jack.42
Figure 21 – De-embedding reference FEXT plug without sockets.43
Figure 22 – De-embedding reference FEXT plug with sockets.44
Figure 23 – Reference FEXT plug mated to PWB.44
Figure 24 – Reference FEXT plug-test lead position .45
Figure 25 – Reference FEXT plug assembly .45
Figure 26 – Test leads connected to de-embedded reference jack/PWB assembly.47
Figure 27 – Reference FEXT plug mated to reference jack/PWB assembly .47
Figure A.1 – THI3KIT test head interface with baluns attached .48
Figure A.2 – Alternative to item 3.1 in Table A.2 .50
Figure A.3 – Pyramid test setup for shielded connectors.50
Figure A.4 – Exploded assembly of the coaxial termination reference test head.52
Figure A.5 – Detailed view of the coaxial termination reference test-head interface .52

60512-26-100 © IEC:2008 – 5 –
Table 1 – Test balun performance characteristics .11
Table 2 – Uncertainty band of return loss measurement at frequencies below 100 MHz.18
Table 3 – Uncertainty band of return loss measurement at frequencies above 100 MHz.18
Table 4 – De-embedded NEXT real and imaginary reference jack vectors.33
Table 5 – Differential mode reference jack vectors.34
Table 6 – Test plug NEXT loss limits for connectors specified up to 100 MHz according
to IEC 60603-7-2 or IEC 60603-7-3.35
Table 7 – Test plug NEXT loss limits for connectors specified up to 250 MHz according
to IEC 60603-7-4 or IEC 60603-7-5.36
Table 8 – Test-plug differential and differential with common-mode consistency .37
Table 9 – Test plug FEXT requirements – De-embedding method .39
Table 10 – Return loss requirements for return loss reference plug.41
Table A.1 – Coaxial termination reference head component list .48
Table A.2 – Coaxial termination reference head, additional parts .49
Table A.3 – Coaxial termination reference head component list .51

– 6 – 60512-26-100 © IEC:2008
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONNECTORS FOR ELECTRONIC EQUIPMENT –
TESTS AND MEASUREMENTS –
Part 26-100: Measurement setup, test and reference arrangements and
measurements for connectors according to IEC 60603-7 – Tests 26a to 26g

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 60512-26-100 has been prepared by subcommittee 48B:
Connectors, of IEC technical committee 48: Electromechanical components and mechanical
structures for electronic equipment.
This standard cancels and replaces the Annexes of IEC 60603-7-x documents dealing with
transmission characteristics for interoperability and backward compatibility.
This standard is to be read in conjunction with IEC 60512-1 and IEC 60512-1-100 which
explains the structure of the IEC 60512 series.

60512-26-100 © IEC:2008 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
48B/1892/FDIS 48B/1925/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.
A list of all parts of the IEC 60512 series, under the general title Connectors for electronic
equipment – Tests and measurements, can be found on the IEC website.
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.
– 8 – 60512-26-100 © IEC:2008
INTRODUCTION
Detail specifications for 8-way, free and fixed connectors such as IEC 60603-7-4:2005 and
IEC 60603-7-5:2007 define measurement setup, test and reference arrangements and
measurements for interoperability and backward compatibility tests for connectors according
IEC 60603-7 up to 250 MHz for insertion loss (IL), near end crosstalk (NEXT), far end
crosstalk (FEXT), return loss (RL) and balance (transverse conversion loss, TCL, and
transverse conversion transfer loss, TCTL) as well as the de-embedding method to qualify the
fixed (outlet) connector.
This standard keeps the technical content of the test methods specified in the annexes C to J
as specified in IEC 60603-7-4:2005 and annexes C to K as specified in IEC 60603-7-5:2007,
but it structures and harmonizes the measurements for better readability. This standard is
intended to be referenced by the future second editions of IEC 60603-7-x and the future first
editions of IEC 60603-7-xy (under preparation). This standard is intended to be referenced by
IEC 60603-7-x Edition 2.0 and IEC 60603-7-xy Edition 1.0 standards (under preparation) and
may be referenced for all IEC standards with 60603-7 interface.
IEC 60516-26-100: Connectors for electronic equipment – Tests and measurements – Part
26-100, consists of the following clauses:
• Clause 3: General requirements for measurement setup
• Clause 4: Connector measurement up to 250 MHz
NOTE 1 Clauses 3 and 4 define the measurement procedures to qualify the outlet
• Clause 5: Construction and qualification of test plugs
NOTE 2 The wiring of the plug has an effect on the mated connector performance. Extensive measurements show
that NEXT and FEXT are affected in a particular way so that the properties of the test plug must be controlled. To
ensure adequate performance for the outlet over the expected range of different plug wiring, it shall be tested with
a set of up to 12 test plugs with different NEXT performances. The outlet complies with the NEXT requirements of
the standard only if all the combinations comply with their requirements for near end crosstalk. FEXT is handled in
a similar way, but only one test plug is required. Clause 5 describes the construction and qualification of test plugs.
Test plugs are used in the laboratory as long as possible to avoid the costly procedure to find new test plugs.
• Clause 6: Reference jack construction and measurement – the basics of the de-
embedding test method
NOTE 3 Clause 6 describes the preparation and measurements of the reference plugs and jacks as a basis of the
de-embedding test method.
The test methods provided here are:
• insertion loss, test 26a;
• return loss, test 26b;
• near-end crosstalk (NEXT), test 26c;
• far-end crosstalk (FEXT), test 26d;
• transfer impedance (Z ), test 26e;
T
• transverse conversion loss (TCL), test 26f;
• transverse conversion transfer loss (TCTL), test 26g.
For the coupling attenuation, see EN 50289-1-14.

60512-26-100 © IEC:2008 – 9 –
CONNECTORS FOR ELECTRONIC EQUIPMENT –
TESTS AND MEASUREMENTS –
Part 26-100: Measurement setup, test and reference arrangements
and measurements for connectors according to IEC 60603-7 –
Tests 26a to 26g
1 Scope
This part of IEC 60512 specifies the test and measurements and the related measurement
setup and reference arrangements for interoperability and backward compatibility tests for the
development and qualification of 8-way, free and fixed connectors for data transmission.
2 Normative reference
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 60169-15, Radio-frequency connectors – Part 15: R.F. coaxial connectors with inner
diameter of outer conductor 4.13 mm (0.163 in) with screw coupling – Characteristic
impedance 50 ohms (Type SMA)
IEC 60512-1, Connectors for electronic equipment – Tests and measurements – Part 1:
General
IEC 60512-1-100, Connectors for electronic equipment – Tests and measurements – Part 1-
100: General – Applicable publications
IEC 60603-7, 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 60603-7-2, Connectors for electronic equipment – Part 7-2: Detail specification for 8-way,
unshielded, free and fixed connectors, for data transmissions with frequencies up to 100 MHz
IEC 60603-7-3, Connectors for electronic equipment – Part 7-3: Detail specification for 8-way,
shielded, free and fixed connectors, for data transmissions with frequencies up to 100 MHz
IEC 60603-7-4:2005, Connectors for electronic equipment – Part: 7-4: Detail specification for
8-way, unshielded, free and fixed connectors, for data transmissions with frequencies up to
250 MHz
IEC 60603-7-5:2007, Connectors for electronic equipment – Part: 7-5: Detail specification for
8-way, shielded, free and fixed connectors, for data transmissions with frequencies up to
250 MHz
IEC 61156 (all parts), Multicore and symmetrical pair/quad cables for digital communications
IEC 61169-16, Radio-frequency connectors – Part 16: RF coaxial connectors with inner
diameter of outer conductor 7 mm (0,276 in) with screw coupling – Characteristic impedance
50 ohms (75 ohms) (Type N)
– 10 – 60512-26-100 © IEC:2008
IS0 11801:2002, Information technology – Generic cabling for customer premises
ITU-T Recommendation G.117, Transmission aspects of unbalance about earth
ITU-T Recommendation O.9, Measuring arrangements to assess the degree of unbalance
about earth
EN 50289-1-14, Communication cables – Specification for test methods – Part 1-14: Electrical
test methods – Coupling attenuation or screening attenuation of connecting hardware
3 General requirements for measurement setup
3.1 Test instrumentation
These electrical test procedures require the use of a vector network analyser. The analyser
shall have be capabile of full 2-port calibrations. The analyser shall cover the frequency range
of 1 MHz to 1 GHz at least.
At least two test baluns are required in order to perform measurements with balanced
symmetrical signals. The requirements for the baluns are given in 3.4.
Reference loads and cables are needed for the calibration of the set-up. Requirements for the
reference loads and cables are given in 3.5.1 and 3.5.2 respectively.
Termination loads are needed for termination of pairs, used and unused, which are not
terminated by the test baluns. Requirements for the termination loads are given in 3.9.
An absorbing clamp and ferrite absorbers are needed for the coupling attenuation
measurements. The requirements for these items are given in EN 50289-1-14.
3.2 Coaxial cables and test leads for network analysers
Coaxial cable assemblies between network analyser and baluns should be as short as
possible. (It is recommended that they do not exceed 60 cm each.)
The baluns shall be electrically bonded to a common ground plane. For crosstalk
measurements, a test fixture may be used, in order to reduce residual crosstalk (see 3.9 and
Annex A).
Balanced test leads and associated connecting hardware to connect between the test
equipment and the connector under test shall be taken from components that meet or exceed
the requirements for the relevant class of balanced cabling performance according to
ISO/IEC 11801. Balanced test leads shall be limited to a maximum of 7 cm between each
balun and the reference plane of the connector under test. Pairs shall remain twisted from the
baluns to where connections are made. The impedance of the test leads from the DUT
(Device Under Test) to the baluns shall be managed, as far as possible, for both differential
and common modes. This can be done by mounting the test leads in a pyramid, channel, or
other device.
3.3 Measurement precautions
To assure a high degree of reliability for transmission measurements, the following
precautions are required.
a) Consistent and stable balun and resistor loads shall be used for each pair throughout the
test sequence.
60512-26-100 © IEC:2008 – 11 –
b) Cable and adapter discontinuities, as introduced by physical flexing, sharp bends and
restraints shall be avoided before, during and after the tests.
c) Consistent test methodology and terminations (baluns or resistors) shall be used at all
stages of transmission performance qualifications.
The relative spacing of conductors in the pairs shall be preserved throughout the tests to
the greatest extent possible.
d) The balance of the cables is maintained to the greatest extent possible by consistent
conductor lengths and pair twisting to the point of load.
e) The sensitivity to set-up variations for these measurements at high frequencies demands
attention to detail for both the measurement equipment and the procedures.
f) All common mode terminations and the housing of the baluns shall be terminated to one
common ground plane.
3.4 Balun requirements
The baluns may be balun transformers or 180° hybrids with attenuators to improve matching if
needed (see Figure 1).
Attenuator
180° hybrid
Test port
To network analyzer
Attenuator
IEC  117/05
Figure 1 – Optional 180° hybrid used instead of a balun
The specifications for the baluns apply for the whole frequency range for which they are used.
Baluns shall be shielded and shall comply with the specifications listed in Table 1.
Table 1 – Test balun performance characteristics
Parameter Requirement at test frequencies
up to 250 MHz
Impedance, primary Matched to applied network analyser
Impedance, secondary
100 Ω
Insertion loss 10 dB maximum
Return loss secondary 14 dB minimum

a)
Return loss common mode with common mode termination 10 dB minimum

a)
Return loss common mode without common mode termination 1 dB maximum

b)
Longitudinal balance 50 dB
c)
Common mode rejection 50 dB
c)
Output signal balance 50 dB
Power rating 0,1 W
a)
Measured by connecting the balanced output terminals together and measuring the return loss. The nominal
primary impedance shall terminate the primary input terminal.
b)
Applicable for baluns, which are used for balance measurements. Measured from the primary input terminal to
the common mode terminal when the secondary balanced terminal is terminated with 100 Ω.
c)
Measured according to ITU-T Recommendations G.117 and O.9 (formerly CCITT recommendations).

– 12 – 60512-26-100 © IEC:2008
3.5 Reference components for calibrations
3.5.1 Reference loads for calibration
To perform a one or two-port calibration of the test equipment, a short circuit, an open circuit
and a reference load are required. These devices shall be used to obtain a calibration at the
reference plane.
The reference load e.g. chip resistors shall be calibrated against a calibration reference,
which shall be a 50 Ω load, traceable to an international reference standard. Two 100 Ω
reference loads in parallel shall be calibrated against the calibration reference. The reference
loads for calibration shall be placed in an appropriate connector, e.g. N-type connector
according to IEC 61169-16 or SMA connector according to IEC 60169-15, meant for panel
mounting, which is machined flat on the back side (see Figure 2). The loads shall be fixed to
the flat side of the connector, distributed evenly around the centre conductor. A network
analyser shall be calibrated, 1-port full calibration, with the calibration reference. Thereafter,
the return loss of the reference loads for calibration shall be measured. The verified return
loss shall be >46 dB at frequencies up to 100 MHz and >40 dB at fre
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