1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 11451-4:2013Road vehicles V e h i c l e test methods for electrical disturbances from narrowband radiated electromagnetic energyPart 4: Bulk current injection (BCI)BS ISO
2、11451-4:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 11451-4:2013. It supersedes BS ISO 11451-4:2006, which is withdrawn.The UK participation in its preparation was entrusted to T e c h n i c a l C o m m i t t e e A U E / 1 6 , E l e c t r i c a l a n d
3、 e l e c t r o n i c e q u i p m e n t .A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards
4、Institution 2013. Published by BSI Standards Limited 2013.ISBN 978 0 580 76939 9 ICS 33.100.20; 43.040.10 Compliance with a British Standard cannot confer immunityfrom legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April
5、 2013.Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 11451-4:2013 ISO 2013Road vehicles Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy Part 4: Bulk current injection (BCI)Vhicules routiers Mthodes dessai dun vhicule soumis des
6、perturbations lectriques par rayonnement dnergie lectromagntique en bande troite Partie 4: Mthode dinjection de courant (BCI)INTERNATIONAL STANDARDISO11451-4Third edition2013-04-01Reference numberISO 11451-4:2013(E)BS ISO 11451-4:2013ISO 11451-4:2013(E)ii ISO 2013 All rights reservedCOPYRIGHT PROTEC
7、TED DOCUMENT ISO 2013All 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. Permis
8、sion can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 11451-4:2013ISO 11451-4:
9、2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Test conditions . 15 Test instrument description and specification . 25.1 BCI system . 25.2 Instrumentation . 25.3 Test set-up . 26 Test procedure 26.1 Test plan 26.2 Test
10、methods . 26.3 Test report . 4Annex A (normative) Current injection probe calibration method . 5Annex B (normative) Current measurement probe calibration method 7Annex C (informative) Function performance status classification (FPSC) . 8BS ISO 11451-4:2013ISO 11451-4:2013(E)ForewordISO (the Internat
11、ional 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 bee
12、n 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 stand
13、ardization.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 accordan
14、ce with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention 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 p
15、atent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny trade name used in this document is information given for the convenience of users and does not constitute an endorsement.The comm
16、ittee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical and electronic equipment.This third edition cancels and replaces the second edition (ISO 11451-4:2006), which has been technically revised.ISO 11451 consists of the following parts, under the general title
17、 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 2013 All rights reserv
18、edBS ISO 11451-4:2013INTERNATIONAL STANDARD ISO 11451-4:2013(E)Road vehicles Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy Part 4: Bulk current injection (BCI)1 ScopeThis part of ISO 11451 specifies bulk current injection (BCI) test methods for test
19、ing the 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). The electromagnetic disturbance considered in this part of ISO 11451 is limited to continuous narrowba
20、nd electromagnetic fields.ISO 11451-1 gives definitions, practical use and basic principles of the test methods.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 ed
21、ition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 11451-1:2005, Road vehicles Vehicle test methods for electrical disturbances from narrowband radiated electromagnetic energy Part 1: General principles and terminology3 T
22、erms and definitionsFor the purposes of this document, the terms and definitions given in ISO 11451-1 apply.4 Test conditionsThe applicable frequency range for this test method is 1 MHz to 400 MHz. The frequency range of the BCI test method is a direct function of the current probe characteristics.
23、More than one type of current probe may be required to cover the applicable frequency range.The users shall specify the test severity level(s) over the frequency range. Suggested test severity levels are given in Annex C. These test severity levels are expressed in terms of the equivalent root-mean-
24、square value of the unmodulated wave.Standard test conditions are given in ISO 11451-1 for the following: test temperature, supply voltage, modulation, dwell time, frequency step sizes, definition of test severity levels, and ISO 2013 All rights reserved 1BS ISO 11451-4:2013ISO 11451-4:2013(E) test
25、signal quality.5 Test instrument description and specification5.1 BCI systemBCI is a method of carrying out immunity tests by inducing disturbance signals directly into the wiring harness by means of a current injection probe. The injection probe is a current transformer through which the wires of t
26、he device under test (DUT) are passed. Immunity tests are then carried out by varying the test severity level and frequency of the induced disturbance.BCI shall be conducted on each individual system fitted to the vehicle.5.2 InstrumentationFigure 1 shows an example of a BCI test configuration.An in
27、jection probe or set of probes capable of operating over the test frequency range is required to interface the test equipment of the DUT. The probe shall be capable of withstanding a continuous input power over the test frequency range regardless of the system loading.The current measurement probe o
28、r set of probes shall be capable of operating over the test frequency range. The current measurement probe(s) shall be terminated in the load impedance at which they are calibrated.5.3 Test set-upThe vehicle should be tested as built; no additional grounding connections are allowed. Tests should be
29、performed inside a shielded room.The distance between the vehicle and all other conductive structures, such as the walls of a shielded room (with the exception of the ground plane underneath the vehicle) shall be a minimum of 0,5 m.6 Test procedure6.1 Test planPrior to performing the tests, a test p
30、lan shall be prepared; it shall include interface test points, mode of operation for the DUT, acceptance criteria for the DUT, and any special instructions and changes from the standard test. Each DUT shall be verified under the most significant conditions, i.e. at least in stand-by mode and in a mo
31、de where all the actuators can be excited.6.2 Test methodsCAUTION Hazardous voltages and fields may exist within the test area. Care shall be taken to ensure that the requirements for limiting the exposure of humans to radio frequency (RF) energy are met.There are two test methods for the BCI test:
32、the Substitution method and the Closed-loop method (see 5.2.1 and 5.2.2, respectively).For both tests, the test equipment shall be connected in a manner similar to that shown in Figure 1.2 ISO 2013 All rights reservedBS ISO 11451-4:2013ISO 11451-4:2013(E)Dimensions in millimetresKey1 signal generato
33、rs2 broadband amplifier3 RF 50 directional coupler4 RF power level measuring device or equivalent5 RF injection probe6 RF current measurement probe (required for Closed-loop method, optional for Substitution method)7 DUT8 spectrum analyser or equivalent (required for Closed-loop method, optional for
34、 Substitution method)NOTE It is recommended that appropriate ferrite chokes be placed on the coaxial cables to the injection and current measurement probes.Figure 1 Example of BCI test configuration6.2.1 Substitution methodThis method is based upon the use of forward power as the reference parameter
35、 for calibration and test.In this method, the specific test level (current, voltage or power) shall be calibrated prior to the actual testing.The test with the DUT is then conducted by subjecting it to the test signals based on the calibrated values as predetermined in the test plan.Measurements usi
36、ng this method can be affected by coupling between the injection probe and the wiring harness as well as by reflected energy.Mount the current injection probe around the harness (150 10) mm from the connector or the outlet aperture of the DUT being tested on the vehicle.Where the harness contains a
37、number of branches to a DUT, the test should be repeated with the current probe(s) clamped around each of the branches (150 10) mm from the branch termination. Under these test conditions, the measuring probe, if used, shall be left at its previous distance from the DUT.Using the pre-calibrated leve
38、l of forward power (see Annex A), conduct a search for events over the frequency range of the injection probe.For each event, record the lowest forward power to the probe as the threshold of immunity even if this is found with the injection probe in different positions at different frequencies.A cur
39、rent measurement probe may optionally be mounted between the current injection probe and the DUT. It may provide extra useful information but it may also modify the test conditions. Where this probe is used, the measured current cannot be used to determine the performance of the DUT, but should be r
40、etained and used during investigative work for the causes of events and the variances in test conditions after system modifications. ISO 2013 All rights reserved 3BS ISO 11451-4:2013ISO 11451-4:2013(E)6.2.2 Closed-loop methodThe RF to the current injection probe shall be increased until the predeter
41、mined maximum test current level, measured using the current measurement probe, is reached, or the maximum forward power (defined in the test plan) to the injection probe is achieved.The current measurement probe shall be calibrated using the method in Annex B.Record the threshold of susceptibility
42、as a function of frequency.6.3 Test reportWhen required in the test plan, a test report shall be submitted detailing information regarding the test equipment, test site, systems tested, frequencies, power levels, system interactions and any other relevant information regarding the test.4 ISO 2013 Al
43、l rights reservedBS ISO 11451-4:2013ISO 11451-4:2013(E)Annex A (normative) Current injection probe calibration methodTo determine the injected current flowing, the forward power measurement across a calibration fixture is used. Figure A.1 shows an example of a test equipment configuration for the cu
44、rrent injection probe calibration.Mount the current injection probe centred in the calibration fixture (see Figure A.2), and while sweeping the test frequency range, monitor the forward power required to achieve the current at which testing is to be conducted.As an alternative method, once testing o
45、f the system is complete and all data has been recorded, mount the current injection probe in the calibration fixture. At each frequency showing an event, the recorded forward power levels are applied to the probe. The currents then observed in the calibration fixture are those at which events withi
46、n the system occurred.Key1 shielded enclosure2 50 coaxial load, VSWR 1,2: 1 max3 calibration fixture4 injection probe5 50 attenuator6 spectrum analyser or equivalent7 RF power level measuring device (two are required)8 RF 50 dual directional coupler (with 30 dB minimum decoupling coefficient)9 broad
47、band amplifier with 50 output impedance10 RF signal generatorFigure A.1 Example of current injection probe calibration configuration ISO 2013 All rights reserved 5BS ISO 11451-4:2013ISO 11451-4:2013(E)Key1 insulation2 removable metal cover3 current injection probe4 direct connection to 50 measuremen
48、t equipment5 direct connection to 50 loadFigure A.2 Example of calibration fixture (jig)The physical size of the calibration fixture shall be in accordance with the probe manufacturers requirements.6 ISO 2013 All rights reservedBS ISO 11451-4:2013ISO 11451-4:2013(E)Annex B (normative) Current measur
49、ement probe calibration methodMount the current measurement probe in the proper size calibration fixture with the probe concentric about the centre conductor of the fixture (see Figure B.1).Record the output of the current measurement probe as a function of frequency while maintaining a constant RF calibration signal power.Based on a known termination impedance, the output voltage versus input current can be determined.Key1 RF signal generator2 broadband amplifier with 50 output im
