IEC 61196-1-108:2011

Coaxial communication cables - Part 1-108: Electrical test methods - Test for characteristic impedance, phase and group delay, electrical length and propagation velocity

IEC 61196-1-108:2011(E) applies to coaxial communications cables. It specifies test methods for determining the characteristic impedance, phase and group delay, electrical length and propagation velocity of coaxial cables for use in telecommunications networks. This second edition replaces the first edition published in 2005. The main changes to the previous edition is the enclosing of Annex A describing the measurement of phase dispersion.

General Information

• Status: Published
• Publication Date: 28-Nov-2011
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 33.120.10 - Coaxial cables. Waveguides
• Technical Committee: SC 46A - Coaxial cables
• Current Stage: PPUB - Publication issued
• Start Date: 29-Nov-2011
• Completion Date: 29-Nov-2011

Standards Content (Sample)

IEC 61196-1-108
Edition 2.0 2011-11
INTERNATIONAL
STANDARD
colour
inside
Coaxial communication cables –
Part 1-108: Electrical test methods – Test for characteristic impedance, phase
and group delay, electrical length and propagation velocity
IEC 61196-1-108:2011(E)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61196-1-108
Edition 2.0 2011-11
INTERNATIONAL
STANDARD
colour
inside
Coaxial communication cables –
Part 1-108: Electrical test methods – Test for characteristic impedance, phase
and group delay, electrical length and propagation velocity
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
ICS 33.120.10 ISBN 978-2-88912-786-3
® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – 61196-1-108 © IEC:2011(E)
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope ............................................................................................................................... 5

2 Normative references ....................................................................................................... 5

3 Terms and definitions ....................................................................................................... 5

4 Parameters ....................................................................................................................... 5

5 Test method ..................................................................................................................... 6

5.1 Equipment ............................................................................................................... 6

5.2 Test sample ............................................................................................................ 6

5.3 Procedure ............................................................................................................... 7

6 Expression of test results ................................................................................................. 7

6.1 Phase constant β..................................................................................................... 7

6.2 Phase and group delay ............................................................................................ 8

6.3 Velocity of propagation ............................................................................................ 8

6.4 Electrical length....................................................................................................... 8

6.5 Characteristic impedance ........................................................................................ 9

7 Test report........................................................................................................................ 9

8 Requirements ................................................................................................................... 9

Annex A (normative) Phase dispersion measurement of coaxial cables................................ 10

Bibliography .......................................................................................................................... 14

Figure 1 – Phase shift expanded ............................................................................................. 7

Figure A.1 – Phase dispersion of 1/2" cable with deeply corrugated outer conductor ............ 13

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61196-1-108 © IEC:2011(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COAXIAL COMMUNICATION CABLES –
Part 1-108: Electrical test methods –
Test for characteristic impedance, phase and group delay,
electrical length and propagation velocity
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

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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

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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) 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 61196-1-108 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 replaces the first edition published in 2005. The main changes to the

previous edition is the enclosing of Annex A describing the measurement of phase dispersion.

The text of this standard is based on the following documents:
FDIS Report on voting
46A/1039/FDIS 46A/1057/RVD
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– 4 – 61196-1-108 © IEC:2011(E)

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 standard is intended to be read in conjunction with IEC 61196-1. It is based on the

second edition (2005) of that standard.

A list of all parts of 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 publication will remain unchanged until

the stability 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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication 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.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 6 ----------------------
61196-1-108 © IEC:2011(E) – 5 –
COAXIAL COMMUNICATION CABLES –
Part 1-108: Electrical test methods –
Test for characteristic impedance, phase and group delay,
electrical length and propagation velocity
1 Scope

This part of IEC 61196 applies to coaxial communications cables. It specifies test methods for

determining the characteristic impedance, phase and group delay, electrical length and

propagation velocity of coaxial cables for use in telecommunications networks.
A procedure to measure phase dispersion of coaxial cable is included as Annex A.
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 61196-1:2005, Coaxial communication cables – Part 1: Generic specification – General,

definitions and requirements

IEC 61196-1-103, Coaxial communication cables – Part 1-103: Electrical test methods – Test

for capacitance of cable
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 61196-1 apply.

4 Parameters
From the phase constant β of a cable, one can derive several parameters:
group delay (1)
dβ ∆β
τ = ≈
dω ∆ω
phase delay (2)
τ =
propagation velocity (3)
1 ω
v = =
τ β
relative propagation velocity (4)
v 1 l
mech
v = = =
c τ ⋅ c l
p e
electrical length (5)
...