IEC 61196-1-318:2008

IEC 61196-1-318
Edition 1.0 2008-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Coaxial communication cables –
Part 1-318: Mechanical test methods – Heat performance tests

Câbles coaxiaux de communication –
Partie 1-318: Méthodes d’essais mécaniques – Essais de comportement à la
chaleur
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IEC 61196-1-318
Edition 1.0 2008-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Coaxial communication cables –
Part 1-318: Mechanical test methods – Heat performance tests

Câbles coaxiaux de communication –
Partie 1-318: Méthodes d’essais mécaniques – Essais de comportement à la
chaleur
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
J
CODE PRIX
ICS 33.120.10 ISBN 2-8318-9582-0

– 2 – 61196-1-318 © IEC:2008
CONTENTS
FOREWORD.3

1 Scope.5
2 Normative references.5
3 Terms and definitions .5
4 Heat flow resistance of dielectric.5
4.1 Preparation of the test sample .5
4.2 Procedure.6
4.3 Requirement.6
4.4 Test report.6
5 Heat shock resistance.6
5.1 Preparation of the test sample .6
5.2 Procedure.6
5.3 Requirement.7
5.4 Test report.7
6 Heat behaviour of semi-rigid cables .7
6.1 Preparation of the test sample .7
6.2 Procedure.7
6.3 Requirement.7
6.4 Test report.7
7 Dimensional stability .7
7.1 Preparation of the test sample .7
7.2 Procedure.8
7.3 Expression of results .8
7.4 Requirement.8
7.5 Test report.8

Bibliography .9

Figure 1 – Open cylindrical container.8

61196-1-318 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COAXIAL COMMUNICATION CABLES –

Part 1-318: Mechanical test methods –
Heat performance tests
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
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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 61196-1-318 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.
The text of this standard is based on the following documents:
FDIS Report on voting
46A/874/FDIS 46A/891/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.

– 4 – 61196-1-318 © IEC:2008
A list of all the parts in the IEC 61196 series, 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
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.
61196-1-318 © IEC:2008 – 5 –
COAXIAL COMMUNICATION CABLES –

Part 1-318: Mechanical test methods –
Heat performance tests
1 Scope
This part of IEC 61196 applies to coaxial communication cables. It specifies several test
methods for determining:
• heat flow resistance of dielectric: the resistance of the dielectric to the mechanical
distortion induced by radial stress imposed by the inner conductor at high temperatures;
• resistance to heat exposure (formerly “heat shock resistance“): the resistance of the
dielectric or the sheath to high temperatures;
• heat behaviour of semi-rigid cables: the ability of the cable construction of semi-rigid
cables to withstand the expansion of the dielectric at high temperature;
• dimensional stability: the displacement of the cable elements with respect to each other
in order to demonstrate the suitability of a cable for use with connectors.
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, Coaxial communication cables – Part 1: Generic specification – General,
definitions and requirements
IEC 60068-2-2, Environmental testing – Part 2-2: Tests – Tests B: Dry heat
3 Terms and definitions
For the purposes of this document the definitions given in IEC 61196-1 apply.
4 Heat flow resistance of dielectric
4.1 Preparation of the test sample
A sample shall be cut from the finished cable which shall have a length of at least 30 times the
overall diameter of the cable.
A weight, as indicated in the relevant cable specification, shall be attached to the inner
conductor at each end of the test sample.

– 6 – 61196-1-318 © IEC:2008
4.2 Procedure
The test sample shall be bent symmetrically over a horizontal mandrel the dimensions of which
are equal to the minimum bend radius as specified in the relevant cable specification and with
the weights hanging freely from the inner conductor at each end of the test sample. The test
sample shall be heated in accordance with IEC 60068-2-2, test Bb, to the temperature
indicated in the relevant cable specification for at least 8 h.
At the end of the period the weights shall be removed and the test sample shall be allowed to
cool without further bending for 1 h under standard atmospheric conditions for testing. The test
sample shall be stripped down and the movement of the inner conductor from the centre of the
cable shall be measured.
4.3 Requirement
The inner conductor shall not be displaced from the centre by a distance greater than 15 % of
the nominal diameter of the dielectric.
4.4 Test report
The test report shall give the test conditions:
– length of the cable under test (m),
– weight at each end of the sample (kg),
– diameter of the mandrel (mm),
– temperature of the heating (°C),
– duration of the exposure to temperature (h),
and record the result of the examination according to 4.2 of this document.
5 Heat shock resistance
5.1 Preparation of the test sample
A sample shall be cut from the finished cable which shall have a length at least 150 times the
overall diameter of the cable if it is less than 12,5 mm and 120 times the overall diameter of the
cable if it is 12,5 mm or greater.
The test sample shall be coiled to a diameter not less than 30 times the nominal overall
diameter of the cable.
5.2 Procedure
The test sample shall be heated for 7 days in accordance with IEC 60068-2-2, test Bb, at a
temperature indicated in the relevant cable specification.
At the end of the heating period the test sample shall be removed from the oven and allowed to
cool down for 1 h at room temperature, (20 ± 5) °C. Then the whole length of the test sample
shall be wrapped around a mandrel the dimensions of which are equal to the minimum bend
radius as specified in the relevant cable specification and than unwrapped. The cycle shall be
repeated 10 times in a period of 5 min.
The test sample shall be stripped down and examined with normal vision or corrected vision
without magnification.
61196-1-318 © IEC:2008 – 7 –
5.3 Requirement
There shall be no sign of mechanical damage to either the dielectric or the sheath.
5.4 Test report
The test report shall give the test conditions:
– length of the cable under test (m),
– diameter of coiling during heating (mm),
– temperature of the heating (°C),
and record the result of the examination according to 5.2 of this document.
6 Heat behaviour of semi-rigid cables
6.1 Preparation of the test sample
The test sample shall be between 300 mm and 350 mm long. The ends of the test sample shall
be closed by crushing to prevent the dielectric from coming out of the tube outer conductor.
6.2 Procedure
The test sample shall be placed for 1 h in an oven maintained at the temperature indicated in
the relevant cable specification. The test sample shall be allowed to cool to room temperature.
The test sample shall be examined with normal vision or corrected vision without magnification.
6.3 Requirement
Neither cracks nor longitudinal splits shall be visible in the outer conductor. Nor shall the
dielectric core protrude from the ends of the test sample.
6.4 Test report
The test report shall give the test conditions:
– temperature of the heating (°C),
– length of the cable under test (mm),
and record the result of the examination according to 6.2 of this document.
7 Dimensional stability
7.1 Preparat
...