ISO 11452-1:2015

INTERNATIONAL ISO
STANDARD 11452-1
Fourth edition
2015-06-01
Road vehicles — Component test
methods for electrical disturbances
from narrowband radiated
electromagnetic energy —
Part 1:
General principles and terminology
Véhicules routiers — Méthodes d’essai d’un équipement soumis
à des perturbations électriques par rayonnement d’énergie
électromagnétique en bande étroite —
Partie 1: Principes généraux et terminologie
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General aim and practical use . 6
5 General test conditions . 7
5.1 General . 7
5.2 Test temperature . 8
5.3 Supply voltage . . 8
5.3.1 Low Voltage (LV) power supply . 8
5.3.2 HV d.c. power supply (excluding charger) . 8
5.3.3 Charger power supply (a.c. or d.c.) for HV battery . 8
5.4 Modulation . 8
5.5 Dwell time . 9
5.6 Frequency step sizes . 9
5.7 Definition of test severity levels .10
5.8 Disturbance application .10
6 Instrumentation .10
6.1 Grounding and shielding .10
6.2 AN, AMN, and AAN .11
6.3 Power supply .11
6.3.1 LV power supply .11
6.3.2 HV d.c. power supply (excluding charger) .11
6.3.3 Charger power supply (a.c. or d.c.) .11
6.4 Load simulator .11
6.5 Test signal quality .11
7 Test procedure .12
7.1 Test plan .12
7.2 Test methods .12
7.2.1 General.12
7.2.2 Substitution method .12
7.2.3 Closed loop levelling .13
7.2.4 DUT immunity measurement .13
7.3 Test report .14
Annex A (normative) Function Performance Status Classification (FPSC) .15
Annex B (normative) Artificial networks (AN), artificial mains networks (AMN), and
asymmetric artificial networks (AAN) .18
Annex C (informative) Constant peak test level .27
Annex D (informative) Example of load simulator design .30
Bibliography .33
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
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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 on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information.
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 32, Electrical
and electronic components and general system aspects.
This fourth edition cancels and replaces the third edition (ISO 11452-1:2005) which has been technically
revised. It also incorporates the Amendment ISO 11452-1:2005/Amd 1:2008.
ISO 11452 consists of the following parts, under the general title Road vehicles — Component test methods
for electrical disturbances from narrowband radiated electromagnetic energy:
— Part 1: General principles and terminology
— Part 2: Absorber-lined shielded enclosure
— Part 3: Transverse electromagnetic mode (TEM) cell
— Part 4: Harness excitation methods
— Part 5: Stripline
— Part 7: Direct radio frequency (RF) power injection
— Part 8: Immunity to magnetic fields
— Part 9: Portable transmitters
— Part 10: Immunity to conducted disturbances in the extended audio frequency range
— Part 11: Reverberation chamber
iv © ISO 2015 – All rights reserved

Introduction
In recent years, an increasing number of electronic devices for controlling, monitoring, and displaying a
variety of functions have been introduced into vehicle designs. It is necessary to consider the electrical
and electromagnetic environment in which these devices operate.
Electrical and radio-frequency disturbances occur during normal operation of many items of motor
vehicle equipment. They are generated over a wide frequency range with various electrical characteristics
and can be distributed to on-board electronic devices and systems by conduction, radiation, or both.
Narrowband signals generated from sources on or off the vehicle can also be coupled into the electrical or
electronic system, affecting the normal performance of electronic devices. Such sources of narrowband
electromagnetic disturbances include mobile radios and broadcast transmitters.
The characteristics of the immunity of components to radiated disturbances have to be established.
The ISO 11452 series provides various test methods for the evaluation of component immunity
characteristics. Not all test methods need be used for a given device under test (DUT). For example,
stripline and transverse electromagnetic (TEM) cell test methods provide very similar exposure to the
DUT. Only those tests necessary for replicating the use and mounting location of the DUT need to be
included in the test plan. This will help to ensure a technically and economically optimized design for
potentially susceptible components and systems.
The ISO 11452 series is not intended as a product specification and cannot function as one (see A.1).
Therefore, no specific values for the test severity level are given.
Annex A of this part of ISO 11452 specifies a general method for functional performance status
classification (FPSC), Annex B specifies Artificial Networks (AN), Artificial Mains Networks (AMN), and
Asymmetric Artificial Networks (AAN), Annex C explains the principle of constant peak test level while
Annex D describes an example for the design of a load simulator. Typical severity levels are included in
an annex of each of the other parts of ISO 11452.
Protection from potential disturbances has to be considered as a part of total vehicle validation as
described in ISO 11451, which covers vehicle test methods. Component test method described in
the ISO 11452 series is to be performed prior to vehicle test. Due to the vehicle’s shape, harness, and
component location diversities, conformity to parts of ISO 11452 does not guarantee conformity to parts
of ISO 11451. Nevertheless, the ISO 11452 series component tests are essential for giving a sufficient
level of confidence before integration on vehicle(s).
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