ISO 11452-9:2021

INTERNATIONAL ISO
STANDARD 11452-9
Second edition
2021-10
Road vehicles — Component test
methods for electrical disturbances
from narrowband radiated
electromagnetic energy —
Part 9:
Portable transmitters
Véhicules routiers — Méthodes d'essai d'un équipement soumis
à des perturbations électriques par rayonnement d'énergie
électromagnétique en bande étroite —
Partie 9: Émetteurs portables
Reference number
© ISO 2021
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Published in Switzerland
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test conditions .1
5 Test location . 2
6 Test instrumentation .2
6.1 General . 2
6.2 Simulated portable transmitters . 2
6.2.1 General . 2
6.2.2 Dual directional coupler . 3
6.2.3 Power monitoring . 3
6.2.4 Low loss coaxial cable . 4
6.2.5 Vector network analyser (VNA). 4
6.2.6 Transmit antenna . 4
6.2.7 Stimulation and monitoring of the DUT . 5
7 Test set-up . 5
7.1 Ground plane . 5
7.2 LV power supply system . 5
7.3 HV power supply system . 6
7.4 Location of the DUT . 6
7.5 Location of the test harness . 7
7.6 Location of the load simulator . 7
7.7 Location of the simulated portable transmitter equipment. . 7
8 Test procedure .17
8.1 General . 17
8.2 Test plan . 17
8.3 Test procedure . 17
8.3.1 General . 17
8.3.2 DUT test . 18
8.3.3 Antenna positioning for coupling to the DUT/connectors . 21
8.3.4 Antenna positioning for coupling to harness . 26
8.4 Test report .36
Annex A (normative) Net power characterization procedure .37
Annex B (informative) Typical characteristics and use of portable transmitters .48
Annex C (informative) Characteristics of simulated portable transmitter antenna .51
Annex D (informative) Function performance status classification (FPSC) .73
Annex E (informative) Remote/local grounding .74
Annex F (informative) Broadband noise source by AWG (arbitrary waveform generator) .76
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 32,
Electrical and electronic components and general system aspects.
This second edition cancels and replaces the first edition (ISO 11452-9:2012), which has been technically
revised.
The main changes are as follows:
— change of the frequency range from 26 MHz – 5,85 GHz to 142 MHz – 6 GHz;
— suppression of test methodology with commercial transmitters;
— use of modulation from ISO 11452-1;
— modifications of ground plane dimensions;
— introduction of additional artificial networks (HV-AN, AMN, AAN) for DUT powered by a shielded
power system;
— addition of test set-up descriptions and figures for HV power supply system;
— addition of wording for DUT, connector and harness testing;
— addition of new Annex A with description of test methodology for net power characterization
procedure;
— addition in Annex C of microwave broadband dipole antenna and HF broadband sleeve antenna;
— addition of Annex F on broadband noise source with arbitrary waveform generator.
A list of all parts in the ISO 11452 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
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INTERNATIONAL STANDARD ISO 11452-9:2021(E)
Road vehicles — Component test methods for electrical
disturbances from narrowband radiated electromagnetic
energy —
Part 9:
Portable transmitters
1 Scope
This document specifies test methods and procedures for testing electromagnetic immunity of
electronic components for passenger cars and commercial vehicles to portable transmitters in close
proximity, regardless of the propulsion system (e.g. spark-ignition engine, diesel engine, electric
motor). The device under test (DUT), together with the wiring harness (prototype or standard test
harness), is subjected to an electromagnetic disturbance generated by portable transmitters inside an
absorber-lined shielded enclosure, with peripheral devices either inside or outside the enclosure. The
electromagnetic disturbances considered are limited to continuous narrowband electromagnetic fields.
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
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 11452-1, Road vehicles — Component test methods for electrical disturbances from narrowband
radiated electromagnetic energy — Part 1: General principles and terminology
Guidelines for limiting exposure to time-varying electric, magnetic, and electromagnetic fields (up to
300 GHz). International Commission on Non-Ionizing Radiation Protection (ICNIRP)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11452-1 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
reference position
geometrical centre of the radiation pattern of the antenna, which is determined by the manufacturer
based on near field measurement
4 Test conditions
The applicable frequency range of the test method is 142 MHz to 6 GHz.
The user of this document shall specify the test severity level or levels over the frequency bands. The
test severity level shall take into account:
— typical portable transmitter characteristics (frequency bands, power level and modulation), and
— the characteristics of the antenna(s) used for this test.
The user shall specify the test severity level(s) over the frequency range. Suggested test levels are
included in Annex D.
Standard test conditions are given in ISO 11452-1 for the following:
— test temperature;
— supply voltage;
— dwell time;
— test signal quality;
— frequency steps;
— modulation.
NOTE Alternate modulations, if required, can be found in Annex B. Users of this document are advised
that Annex B is for in
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