ISO 11451-1:2015

INTERNATIONAL ISO
STANDARD 11451-1
Fourth edition
2015-06-01
Road vehicles — Vehicle test methods
for electrical disturbances from
narrowband radiated electromagnetic
energy —
Part 1:
General principles and terminology
Véhicules routiers — Méthodes d’essai d’un véhicule 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 . 5
5 General test conditions . 6
5.1 General . 6
5.2 Test temperature . 7
5.3 Supply voltage . . 7
5.3.1 Vehicle Low Voltage (LV) power supply. 7
5.3.2 Hybrid or electric vehicle not connected to power mains . 7
5.3.3 Hybrid or electric vehicle in charging mode (AC or DC) . 7
5.4 Modulation . 7
5.5 Dwell time . 8
5.6 Frequency step sizes . 8
5.7 Definition of test severity levels . 9
5.8 Disturbance application . 9
6 Instrumentation . 9
6.1 AN, AMN, and AAN . 9
6.2 Test signal quality . 9
7 Test procedure .10
7.1 Test plan .10
7.2 Test methods .10
7.2.1 General.10
7.2.2 Substitution .10
7.2.3 Closed loop levelling .11
7.2.4 Vehicle immunity measurement .11
7.3 Test report .12
Annex A (normative) Function Performance Status Classification (FPSC) .13
Annex B (normative) Artificial Networks (AN), Artificial Mains Networks (AMN) and
Asymmetric Artificial Networks (AAN) .16
Annex C (informative) Constant peak test level .22
Bibliography .25
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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electrotechnical standardization.
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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
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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 11451-1:2005), which has been technically
revised. It also incorporates the Amendment ISO 11451-1:2005/Amd 1:2008.
ISO 11451 consists of the following parts, under the general title Road vehicles — Vehicle test methods for
electrical disturbances from narrowband radiated electromagnetic energy:
— Part 1: General principles and terminology
— Part 2: Off-vehicle radiation sources
— Part 3: On-board transmitter simulation
— Part 4: Bulk current injection (BCI)
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 the 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 and 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 a vehicle to radiated disturbances have to be established.
ISO 11451 provides various test methods for the evaluation of vehicle immunity characteristics (not all
methods need be used to test a vehicle).
ISO 11451 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 specifies a general method for function performance status classification (FPSC), Annex
B specifies Artificial Networks (AN), Artificial Mains Networks (AMN) and Asymmetric Artificial
Networks (AAN), while annex C explains the principle of constant peak test level. Typical severity levels
are included in an annex of each of the other parts of ISO 11451.
Protection from potential disturbances needs to be considered in a total system validation, and this can
be achieved using the various parts of ISO 11451.
NOTE Immunity measurements of complete vehicles are generally able to be carried out only by the vehicle
manufacturer, owing to, for example, high costs of absorber-lined shielded enclosures, the desire to preserve
the secrecy of prototypes or a large number of different vehicle models. ISO 11452 specifies test methods for the
analysis of component immunity, which are better suited for supplier use.
INTERNATIONAL STANDARD ISO 11451-1:2015(E)
Road vehicles — Vehicle test methods for electrical
disturbances from narrowband radiated electromagnetic
energy —
Part 1:
General principles and terminology
1 Scope
This part of ISO 11451 specifies general conditions, defines terms, gives practical guidelines, and
establishes the basic principles of the vehicle tests used in the other parts of ISO 11451, for determining
the immunity of passenger cars and commercial vehicles to electrical disturbances from narrowband
radiated electromagnetic energy, regardless of the vehicle propulsion system (e.g. spark-ignition engine,
diesel engine, electric motor).
The electromagnetic disturbances considered are limited to continuous narrowband electromagnetic
fields. A wide frequency range (0,01 MHz to 18 000 MHz) is allowed for the immunity testing in this and
the other parts of ISO 11451.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
CISPR 16-1-2, Specification for radio disturbance and immunity measuring apparatus and methods —
Part 1-2: Radio disturbance and immunity measuring apparatus — Ancillary equipment — Conducted
disturbances; Edition 1.2.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
absorber-lined shielded enclosure
shielded enclosure/screened room with radio frequency absorbing material on its internal ceiling and
walls
Note 1 to entry: The common practice is for the room to have a metallic floor, but absorbing material can also be
used on the floor.
3.2
amplitude modulation
AM
process by which the amplitude of a carrier wave is varied following a specified law, resulting in an AM
signal
...