IEC 61196-1-108:2025
(Main)Coaxial communication cables - Part 1-108: Electrical test methods - Test for phase, phase constant, phase and group delay, propagation velocity, electrical length, and mean characteristic impedance
Coaxial communication cables - Part 1-108: Electrical test methods - Test for phase, phase constant, phase and group delay, propagation velocity, electrical length, and mean characteristic impedance
IEC 61196-1-108:2025 applies to coaxial communications cables. It specifies test methods for determining the phase, phase constant, phase and group delay, propagation velocity, electrical length, and mean characteristic impedance of coaxial cables for use in communications systems.
A procedure to measure phase dispersion of coaxial cable is included as Annex A.
This third edition cancels and replaces the second edition published in 2011. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) Change of title, "phase and phase constant" was added.
b) Clause 6, "Preparation of test sample (TS)" was added.
c) Clause 7, "Test procedure" was added.
d) Clause 8, "Failure criterion" was added.
e) Clause 9, "Information to be given in the relevant specification" was added.
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IEC 61196-1-108 ®
Edition 3.0 2025-01
INTERNATIONAL
STANDARD
colour
inside
Coaxial communication cables –
Part 1-108: Electrical test methods – Test for phase, phase constant, phase and
group delay, propagation velocity, electrical length, and mean characteristic
impedance
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IEC 61196-1-108 ®
Edition 3.0 2025-01
INTERNATIONAL
STANDARD
colour
inside
Coaxial communication cables –
Part 1-108: Electrical test methods – Test for phase, phase constant, phase and
group delay, propagation velocity, electrical length, and mean characteristic
impedance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.120.10 ISBN 978-2-8327-0135-5
– 2 – IEC 61196-1-108:2025 © IEC 2025
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Parameters . 5
5 Test equipment . 7
6 Preparation of test sample (TS) . 7
6.1 General . 7
6.2 Method 1 – Long cables . 7
6.3 Method 2 – Short cables . 8
7 Test procedure . 8
7.1 Phase . 8
7.1.1 Method 1 – Long cables . 8
7.1.2 Method 2 – Short cables . 9
7.2 Phase constant . 9
7.3 Phase delay . 10
7.4 Propagation velocity . 10
7.5 Electrical length . 11
7.6 Group delay . 11
7.6.1 Method 1 – long cables . 11
7.6.2 Method 2 – Short cables . 12
7.7 Mean characteristic impedance . 12
8 Failure criterion . 13
9 Information to be given in the relevant specification . 13
10 Test report . 13
Annex A (informative) Phase dispersion measurement of coaxial cables . 14
A.1 Physical background of phase dispersion of coaxial cables . 14
A.2 Measurement of phase dispersion . 16
A.3 Example of 1/2" cable with deeply corrugated outer conductor and smooth
inner conductor wire . 17
Bibliography . 18
Figure 1 – Preparation of long cable . 7
Figure 2 – Preparation of short cables . 8
Figure A.1 – Phase dispersion of 1/2" cable with deeply corrugated outer conductor . 17
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COAXIAL COMMUNICATION CABLES –
Part 1-108: Electrical test methods – Test for phase, phase constant,
phase and group delay, propagation velocity, electrical length,
and mean characteristic impedance
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
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IEC 61196-1-108 has been prepared by subcommittee 46A: Coaxial cables, of IEC technical
committee 46: Cables, wires, waveguides, RF connectors, RF and microwave passive
components and accessories. It is an International Standard.
This third edition cancels and replaces the second edition published in 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Change of title, "phase and phase constant" was added.
b) Clause 6, "Preparation of test sample (TS)" was added.
– 4 – IEC 61196-1-108:2025 © IEC 2025
c) Clause 7, "Test procedure" was added.
d) Clause 8, "Failure criterion" was added.
e) Clause 9, "Information to be given in the relevant specification" was added.
The text of this International Standard is based on the following documents:
Draft Report on voting
46A/1705/FDIS 46A/1717/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This document is to be read in conjunction with IEC 61196-1:2005.
A list of all the parts in the IEC 61196 series, published under the general title Coaxial
communication cables, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
COAXIAL COMMUNICATION CABLES –
Part 1-108: Electrical test methods – Test for phase, phase constant,
phase and group delay, propagation velocity, electrical length,
and mean characteristic impedance
1 Scope
This part of IEC 61196 applies to coaxial communications cables. It specifies test methods for
determining the phase, phase constant, phase and group delay, propagation velocity, electrical
length, and mean characteristic impedance of coaxial cables for use in communications systems.
A procedure to measure phase dispersion of coaxial cable is included as Annex A.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies.
For undat
...
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