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IEC 61935-1-2
Edition 1.0 2018-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Specification for the testing of balanced and coaxial information technology
cabling –
Part 1-2: Installed balanced cabling as specified in ISO/IEC 11801 – Additional
requirements for measurement of resistance unbalance with field test
instrumentation
Spécification relative aux essais des câblages symétriques et coaxiaux des
technologies de l’information –
Partie 1-2: Câblages symétriques installés tels que spécifiés dans
l’ISO/IEC 11801 – Exigences supplémentaires pour le mesurage de l’asymétrie
your local IEC member National Committee for further information.
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IEC 61935-1-2
Edition 1.0 2018-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Specification for the testing of balanced and coaxial information technology
cabling –
Part 1-2: Installed balanced cabling as specified in ISO/IEC 11801 – Additional
requirements for measurement of resistance unbalance with field test
instrumentation
Spécification relative aux essais des câblages symétriques et coaxiaux des
technologies de l’information –
Partie 1-2: Câblages symétriques installés tels que spécifiés dans
l’ISO/IEC 11801 – Exigences supplémentaires pour le mesurage de l’asymétrie
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.120.10 ISBN 978-2-8322-6168-2
– 2 – IEC 61935-1-2:2018 © IEC 2018
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Reference measurement procedure for resistance unbalance . 5
4.1 Reference measurement procedure for resistance unbalance within a pair. 5
4.2 Reference measurement procedure for resistance unbalance between pairs . 6
4.3 Measurement setup for field measurement of resistance unbalance
parameters . 6
5 Field tester requirements for resistance unbalance measurements . 6
5.1 General . 6
5.2 Data reporting and accuracy . 7
5.2.1 Detailed results . 7
5.2.2 Summary results . 7
6 Field tester accuracy performance requirements for resistance unbalance
measurements . 8
7 Accuracy models . 8
7.1 Error model for DC loop resistance . 8
7.2 Error model for resistance unbalance . 9
7.3 Comparison to reference measurements . 9
7.4 Procedures for determining field tester parameters . 9
7.4.1 General . 9
7.4.2 Constant error term of DC loop resistance for loop resistance
measurements . 9
7.4.3 Error term proportional to the DC loop resistance for loop resistance
measurements . 9
7.4.4 Constant error term of resistance unbalance for resistance unbalance
measurements . 9
7.4.5 Error term proportional to the DC loop resistance for resistance
unbalance measurements . 10
Figure 1 – Measurement setup . 6
Table 1 – Additional field test requirements for resistance unbalance measurements . 7
Table 2 – Field tester summary reporting requirements for resistance unbalance
measurements . 8
Table 3 – Accuracy requirements for resistance unbalance measurements . 8
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
SPECIFICATION FOR THE TESTING OF BALANCED AND COAXIAL
INFORMATION TECHNOLOGY CABLING –
Part 1-2: Installed balanced cabling as specified in ISO/IEC 11801 –
Additional requirements for measurement of resistance unbalance
with field test instrumentation
FOREWORD
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International Standard IEC 61935-1-2 has been prepared by IEC technical committee TC 46:
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