Road vehicles — Component test methods for electrical disturbances from narrowband radiated electromagnetic energy — Part 8: Immunity to magnetic fields

ISO 11452-8:2015 specifies tests for electromagnetic immunity of electronic components for passenger cars and commercial vehicles, regardless of the propulsion system (e.g. spark-ignition engine, diesel engine, electric motor), to magnetic fields. These sources are classified into "internal magnetic field" (sources internal to the vehicle, e.g. vehicle electro-mechanical motors, actuators,...) and "external magnetic field" (sources external to the vehicle e.g. power transmission lines, generating stations,?). To perform this test, the device under test (DUT) is exposed to a magnetic disturbance field. The radiating loop method can be applied to small DUTs or to larger DUTs by positioning the coil in multiple locations. The Helmholtz coil is sometimes used as an alternative method. This technique is limited by the relationship between the size of the DUT and the size of the coils. The electromagnetic disturbances considered in this ISO 11452-8:2015 are limited to continuous narrowband electromagnetic fields.

Véhicules routiers — Méthodes d'essai d'un équipement soumis à des perturbations électriques par rayonnement d'énergie électromagnétique en bande étroite — Partie 8: Méthodes d'immunité aux champs magnétiques

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Status
Published
Publication Date
01-Jun-2015
Current Stage
9092 - International Standard to be revised
Start Date
18-Jun-2021
Completion Date
18-Jun-2021
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INTERNATIONAL ISO
STANDARD 11452-8
Second edition
2015-06-01
Road vehicles — Component test
methods for electrical disturbances
from narrowband radiated
electromagnetic energy —
Part 8:
Immunity to magnetic fields
Véhicules routiers — Méthodes d’essai d’un équipement soumis
à des perturbations électriques par rayonnement d’énergie
électromagnétique en bande étroite —
Partie 8: Méthodes d’immunité aux champs magnétiques
Reference number
ISO 11452-8:2015(E)
ISO 2015
---------------------- Page: 1 ----------------------
ISO 11452-8:2015(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2015, Published in Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 11452-8:2015(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Test conditions ....................................................................................................................................................................................................... 1

4.1 General ........................................................................................................................................................................................................... 1

4.2 Frequency step sizes .......................................................................................................................................................................... 2

5 Test location .............................................................................................................................................................................................................. 2

6 Test apparatus description and specification ........................................................................................................................ 2

6.1 General ........................................................................................................................................................................................................... 2

6.2 Field-generating device ................................................................................................................................................................... 3

6.2.1 Radiating loop .................................................................................................................................................................... 3

6.2.2 Helmholtz coil .................................................................................................................................................................... 3

6.3 Current monitor ..................................................................................................................................................................................... 4

6.4 Magnetic field strength monitor .............................................................................................................................................. 4

6.5 Stimulation and monitoring of the DUT ............................................................................................................................ 5

7 Test set-up ................................................................................................................................................................................................................... 5

7.1 General ........................................................................................................................................................................................................... 5

7.2 Power supply ............................................................................................................................................................................................ 6

7.3 Location of the test harness and DUT ................................................................................................................................. 6

7.4 Radiating loop method ..................................................................................................................................................................... 6

7.5 Helmholtz coil method ..................................................................................................................................................................... 7

8 Test procedure ........................................................................................................................................................................................................ 8

8.1 General ........................................................................................................................................................................................................... 8

8.2 Test plan ........................................................................................................................................................................................................ 8

8.3 Test method ............................................................................................................................................................................................... 9

8.3.1 Radiating loop method ............................................................................................................................................... 9

8.3.2 Helmholtz coil method ............................................................................................................................................12

8.4 Test report ................................................................................................................................................................................................13

Annex A (informative) Function performance status classification (FPSC) and test

severity levels .......................................................................................................................................................................................................14

Bibliography .............................................................................................................................................................................................................................17

© ISO 2015 – All rights reserved iii
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ISO 11452-8:2015(E)
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 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 second edition cancels and replaces the first edition (ISO 11452-8:2007), of which it constitutes a

minor revision.

ISO 11452 consists of the following parts, under the general title Road vehicles — Component test methods

for electrical disturbances for 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 transmitter

— Part 10: Immunity to conducted disturbances in the extended audio frequency range

— Part 11: Reverberation chamber
Annex A of this part of ISO 11452 is for information only.
iv © ISO 2015 – All rights reserved
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ISO 11452-8:2015(E)
Introduction

Immunity measurements of complete road 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.

For research, development, and quality control, a laboratory measuring method can be used by both

vehicle manufacturers and equipment suppliers to test electronic components.

ISO 11452-1 specifies general test conditions, definitions, practical use, and basic principles of the test

procedure.
© ISO 2015 – All rights reserved v
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INTERNATIONAL STANDARD ISO 11452-8:2015(E)
Road vehicles — Component test methods for electrical
disturbances from narrowband radiated electromagnetic
energy —
Part 8:
Immunity to magnetic fields
1 Scope

This part of ISO 11452 specifies tests for electromagnetic immunity of electronic components for

passenger cars and commercial vehicles, regardless of the propulsion system (e.g. spark-ignition engine,

diesel engine, electric motor), to magnetic fields. These sources are classified into “internal magnetic

field” (sources internal to the vehicle, e.g. vehicle electro-mechanical motors, actuators,...) and “external

magnetic field” (sources external to the vehicle e.g. power transmission lines, generating stations,…). To

perform this test, the device under test (DUT) is exposed to a magnetic disturbance field.

The radiating loop method can be applied to small DUTs or to larger DUTs by positioning the coil in

multiple locations.

The Helmholtz coil is sometimes used as an alternative method. This technique is limited by the

relationship between the size of the DUT and the size of the coils. The electromagnetic disturbances

considered in this part of ISO 11452 are limited to continuous narrowband electromagnetic fields.

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.

ISO 11452-1, Road vehicles — Component test methods for electrical disturbances from narrowband

radiated electromagnetic energy — Part 1: General principles and terminology

VG 95377-13:1993, Electromagnetic compatibility — Measuring devices and measuring equipment —

measuring antennas, measuring coils and field probes
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 11452-1 apply.

4 Test conditions
4.1 General
The applicable frequency range of this test method is d.c. and 15 Hz to 150 kHz.

The users shall specify the test severity level(s) over the frequency range. Suggested test severity levels

are included in Annex A.
Standard test conditions are given in ISO 11452-1 for the following:
— test temperature;
© ISO 2015 – All rights reserved 1
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ISO 11452-8:2015(E)
— supply voltage;
— dwell time;
— definition of test severity levels.
4.2 Frequency step sizes

The tests shall be conducted at d.c. and at frequencies of 16,67 Hz, 50 Hz, 60 Hz, 150 Hz, and 180 Hz and

with frequency step sizes (logarithmic or linear) not greater than those specified in Table 1. The step

sizes agreed upon by the users of this part of ISO 11452 shall be documented in the test report.

Table 1 — Maximum frequency steps sizes
Frequency band Linear steps Logarithmic steps
kHz kHz %
0 (d.c.) - -
0,015 to 0,1 0,01 10
0,1 to 1 0,1 10
1 to 10 1 10
10 to 150 10 10
NOTE The 5th harmonic of 16,67 Hz, 50 Hz and 60 Hz can also be tested.

If it appears that the susceptibility thresholds of the DUT are very near to the chosen test level, these

frequency step sizes should be reduced in the frequency range concerned in order to find the minimum

susceptibility thresholds.
5 Test location
A shielded room is not required.
[2][3]

IMPORTANT — The appropriate guidelines (national regulation, ICNIRP, etc.) shall be

followed for the protection of the test personnel.
6 Test apparatus description and specification
6.1 General
The test apparatus shall consist of the following:
— field-generating device(s): radiating loop or Helmholtz coil;
— magnetic field strength monitor;
— low-frequency (LF) generator;
— low-frequency (LF) amplifier (capable of driving inductive load);
— voltmeter;
— current monitor;
— artificial network(s) (AN) (optional, see ISO 11452-1 for characteristics).
2 © ISO 2015 – All rights reserved
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ISO 11452-8:2015(E)
6.2 Field-generating device
6.2.1 Radiating loop

The radiating loop of MIL STD 461 F is recommended (not suitable for high level d.c. fields), but any

similar coil may be used. The MIL STD 461 F coil has the following characteristics:

— diameter: 120 mm;
— number of turns: 20;
— wire: approximate diameter 2,0 mm (AWG12).

For d.c. fields up to 3 000 A/m, a specialized coil is required in accordance with VG 95377-13.

The magnetic flux density B of this radiating loop of MIL STD 461 F with a current I at a distance of

50mm
50 mm from the plane of the loop is given by Formula (1):
BH==μ 95I (1)
50mm0
where
B is the magnetic flux density, in microtesla;
H is the magnetic field, in amperes per metre;
95 is a constant, in volt. second per ampere per square meter;
I is the coil current, in amperes.

The magnetic field strength H of this radiating loop of MIL STD 461 F with a current I at a distance

50mm
of 50 mm from the plane of the loop is given by Formula (2):
HI=75,6 (2)
50mm
where
H is the magnetic field, in amperes per metre;
75,6 is a constant, per metre;
I is the coil current, in amperes.

The radiating loop should be characterized over the frequency range. Linearity characteristics shall be

considered in determining the calculated current value for the DUT test.
6.2.2 Helmholtz coil

Ideally, Helmholtz coils set up a region of uniform magnetic fields. The primary usage of the coils is to

expose the DUT to a uniform magnetic field.

The radius of the coils is determined by the size of the DUT. In order to obtain a

...

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