1、BSI Standards PublicationBS ISO 11452-8:2015Road vehicles Componenttest methods for electricaldisturbances from narrowbandradiated electromagneticenergyPart 8: Immunity to magnetic fieldsBS ISO 11452-8:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 11452-
2、8:2015.It supersedes BS ISO 11452-8:2007 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee AUE/16, Data Communication (Road Vehicles).A list of organizations represented on this committee can beobtained on request to its secretary.This publication does no
3、t purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 78593 1ICS 33.100.20; 43.040.10Compliance with a British Standard cannot confer immunity from
4、legal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2015.Amendments issued since publicationDate Text affectedBS ISO 11452-8:2015 ISO 2015Road vehicles Component test methods for electrical disturbances from narrowband ra
5、diated electromagnetic energy Part 8: Immunity to magnetic fieldsVhicules routiers Mthodes dessai dun quipement soumis des perturbations lectriques par rayonnement dnergie lectromagntique en bande troite Partie 8: Mthodes dimmunit aux champs magntiquesINTERNATIONAL STANDARDISO11452-8Second edition20
6、15-06-01Reference numberISO 11452-8:2015(E)BS ISO 11452-8:2015ISO 11452-8:2015(E)ii ISO 2015 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2015, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any f
7、orm 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 ISOs member body in the country of the requester.ISO copyright officeCh. de Blandonn
8、et 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 11452-8:2015ISO 11452-8:2015(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Test conditions . 14.1 General . 14.2 Frequency step sizes
9、 25 Test location 26 Test apparatus description and specification 26.1 General . 26.2 Field-generating device . 36.2.1 Radiating loop 36.2.2 Helmholtz coil 36.3 Current monitor . 46.4 Magnetic field strength monitor 46.5 Stimulation and monitoring of the DUT 57 Test set-up . 57.1 General . 57.2 Powe
10、r supply 67.3 Location of the test harness and DUT . 67.4 Radiating loop method . 67.5 Helmholtz coil method . 78 Test procedure 88.1 General . 88.2 Test plan 88.3 Test method . 98.3.1 Radiating loop method . 98.3.2 Helmholtz coil method 128.4 Test report 13Annex A (informative) Function performance
11、 status classification (FPSC) and test severity levels .14Bibliography .17 ISO 2015 All rights reserved iiiContents PageBS ISO 11452-8:2015ISO 11452-8:2015(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). T
12、he 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-go
13、vernmental, 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
14、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
15、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 li
16、st 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
17、 as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 32, Electrical and electronic components and general
18、 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 electrom
19、agnetic 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:
20、 Portable transmitter Part 10: Immunity to conducted disturbances in the extended audio frequency range Part 11: Reverberation chamberAnnex A of this part of ISO 11452 is for information only.iv ISO 2015 All rights reservedBS ISO 11452-8:2015ISO 11452-8:2015(E)IntroductionImmunity measurements of co
21、mplete 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
22、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 vBS ISO 11452-8:2
23、015BS ISO 11452-8:2015Road vehicles Component test methods for electrical disturbances from narrowband radiated electromagnetic energy Part 8: Immunity to magnetic fields1 ScopeThis part of ISO 11452 specifies tests for electromagnetic immunity of electronic components for passenger cars and commerc
24、ial 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
25、 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 loc
26、ations.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
27、.2 Normative referencesThe 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 amend
28、ments) applies.ISO 11452-1, Road vehicles Component test methods for electrical disturbances from narrowband radiated electromagnetic energy Part 1: General principles and terminologyVG 95377-13:1993, Electromagnetic compatibility Measuring devices and measuring equipment measuring antennas, measuri
29、ng coils and field probes3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 11452-1 apply.4 Test conditions4.1 GeneralThe 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
30、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;INTERNATIONAL STANDARD ISO 11452-8:2015(E) ISO 2015 All rights reserved 1BS ISO 11452-8:2015ISO 11452-8:2015(E) supply voltage; dwell time
31、; definition of test severity levels.4.2 Frequency step sizesThe 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 user
32、s of this part of ISO 11452 shall be documented in the test report.Table 1 Maximum frequency steps sizesFrequency bandkHzLinear stepskHzLogarithmic steps%0 (d.c.) - -0,015 to 0,1 0,01 100,1 to 1 0,1 101 to 10 1 1010 to 150 10 10NOTE The 5th harmonic of 16,67 Hz, 50 Hz and 60 Hz can also be tested.If
33、 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 locationA shielded room is not required.IMPORTANT The appropri
34、ate guidelines (national regulation, ICNIRP,23etc.) shall be followed for the protection of the test personnel.6 Test apparatus description and specification6.1 GeneralThe test apparatus shall consist of the following: field-generating device(s): radiating loop or Helmholtz coil; magnetic field stre
35、ngth 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 reservedBS ISO 11452-8:2015ISO 11452-8:2015(E)6.2 Field-generatin
36、g device6.2.1 Radiating loopThe 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
37、.c. fields up to 3 000 A/m, a specialized coil is required in accordance with VG 95377-13.The magnetic flux density B50mmof this radiating loop of MIL STD 461 F with a current I at a distance of 50 mm from the plane of the loop is given by Formula (1):BHI50mm095= (1)whereB is the magnetic flux densi
38、ty, 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 H50mmof this radiating loop of MIL STD 461 F with a current I at a distance of 50 mm from the plane of the loop
39、is given by Formula (2):HI50mm75,6= (2)whereH 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 c
40、urrent value for the DUT test.6.2.2 Helmholtz coilIdeally, 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 uniform magnetic f
41、ield (10 %), the relationship between the coils and the DUT should be met, as shown in Figure 3. The uniform field region shown in Figure 3 should be a minimum of 300 mm 300 mm 300 mm. ISO 2015 All rights reserved 3BS ISO 11452-8:2015ISO 11452-8:2015(E)For Helmholtz coils spaced one radius apart, th
42、e magnetic flux density at the centre of the system is given by Formula (3):BHNIR=00,899(3)whereB is the magnetic flux density, in microtesla;N is the number of wire turns on the coil;R is the coil radius, in metres;I is the coil current, in amperes;H is the magnetic field, in amperes per metre;0is
43、the magnetic constant, permeability of the vacuum, in henry per metre;0,899 is a constant, in henry per metre.The magnetic field, H, at the centre of the system is given by Formula (4):HNIR=0,7155(4)whereH is the magnetic field, in amperes per metre;N is the number of wire turns on the coil;R is the
44、 coil radius, in metres;I is the coil current, in amperes.The current-carrying capability and number of turns of the coils should be selected such that the test specification can be met.The coils shall not have a self-resonant frequency at or lower than the upper frequency of 150 kHz.The Helmholtz c
45、oil should be characterized over the frequency range. Linearity characteristics shall be considered in determining the calculated current value for the DUT test.6.3 Current monitorThe current monitor shall ensure that true RMS current measurement is made within the frequency range d.c. and 15 Hz to
46、150 kHz, either by using a clamp-on probe or by measuring voltage across a shunt resistor.An oscilloscope, a true RMS a.c. voltmeter, or a true RMS a.c. current meter may be used.6.4 Magnetic field strength monitorFor the radiating loop method, the magnetic field strength monitor to be used is as fo
47、llows: For d.c., the magnetic field strength monitor shall be a Hall-sensor-based measuring instrument.A typical magnetic field strength monitor should be capable of measuring a magnetic field strength of at least 3 000 A/m at d.c4 ISO 2015 All rights reservedBS ISO 11452-8:2015ISO 11452-8:2015(E) I
48、f f 15 Hz, the recommended magnetic field strength monitor is a loop sensor having the following specifications: diameter: 40 mm; number of turns: 51; wire: approx. 0,071 mm (7 strand 41 AWG); shielding: electrostatic; correction factor: see manufacturers data for factor to convert sensor coil volta
49、ge to magnetic intensity.The open-circuit voltage, U, measured in volts by means of a high-impedance voltmeter, is induced in the loop sensor and is calculated as shown in Formula (5):UNAB= 2pi f (5)wheref is the frequency, in Hertz;N is the number of wire turns in the coil;A is the cross-sectional area of the coil, in square metres, calculated with the average diameter of the coil;B is the magnetic flux density, in tesla.A typical magnetic field strength monitor sho
