ISO 11452-4-2011 Road vehicles - Component test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part 4 Harness excitation .pdf

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1、Road vehicles Component test methods for electrical disturbances from narrowband radiated electromagnetic energy Part 4: Harness excitation methods Vhicules routiers Mthodes dessai dun quipement soumis des perturbations lectriques par rayonnement dnergie lectromagntique en bande troite Partie 4: Mth

2、odes dexcitation des faisceaux ISO 2011 Reference number ISO 11452-4:2011(E) Fourth edition 2011-12-15 ISO 11452-4 INTERNATIONAL STANDARDISO 11452-4:2011(E)COPYRIGHT PROTECTED DOCUMENT ISO 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized

3、 in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41

4、 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2011 All rights reservedISO 11452-4:2011(E) ISO 2011 All rights reserved iii Contents Page Foreword iv 1 Scope 1 2 Normative references . 1 3 Terms and definitions . 1 4 Test conditions . 1 5 Test location 2 6 Test

5、 instrumentation . 2 6.1 BCI test method . 2 6.2 TWC test method . 3 7 Test set-up . 4 7.1 Ground plane 4 7.2 Power supply and AN . 4 7.3 Location of the DUT 4 7.4 Length and location of the test harness . 5 7.5 Location of the load simulator . 5 7.6 Location of the harness excitation . 5 8 Test pro

6、cedure .10 8.1 General .10 8.2 Test plan .10 8.3 Test methods 10 8.4 Test report .14 Annex A (normative) Calibration configuration (current injection probe calibration) .15 Annex B (informative) Test set-up transfer impedance 17 Annex C (informative) Artificial network .23 Annex D (informative) Grou

7、nding configurations 25 Annex E (informative) Function performance status classification (FPSC) .27Foreword 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 c

8、arried 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 wor

9、k. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare Inter

10、national Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of th

11、e 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. ISO 11452-4 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical and electronic equipment. This fourth edition canc

12、els and replaces the third edition (ISO 11452-4:2005), which has been technically revised. 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 a

13、nd terminology Part 2: Absorber-lined shielded enclosure Part 3: Transverse electromagnetic (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 condu

14、cted disturbances in the extended audio frequency range Part 11: Reverberation chamber ISO 11452-4:2011(E)iv ISO 2011 All rights reservedINTERNATIONAL STANDARD ISO 11452-4:2011(E)Road vehicles Component test methods for electrical disturbances from narrowband radiated electromagnetic energy Part 4:

15、Harness excitation methods 1 Scope This part of ISO 11452 specifies harness excitation test methods and procedures for determining the immunity of electronic components of passenger cars and commercial vehicles regardless of the propulsion system (e.g. spark-ignition engine, diesel engine, electric

16、motor). The bulk current injection (BCI) test method is based on current injection into the wiring harness using a current probe as a transformer where the harness forms the secondary winding. The tubular wave coupler (TWC) test method is based on a wave coupling into the wiring harness using the di

17、rectional coupler principle. The TWC test method was developed for immunity testing of automotive components with respect to radiated disturbances in the GHz ranges (GSM bands, UMTS, ISM 2,4 GHz). It is best suited to small (with respect to wavelength) and shielded device under test (DUT), since in

18、these cases the dominating coupling mechanism is via the harness. For DUTs which are larger than a wavelength (e.g. 0,1 m at 3 GHz), direct field coupling to the printed circuit board (PCB) becomes of equal importance. The user of the TWC test method should take this into account and determine the a

19、pplicability of the method. The electromagnetic disturbances considered in this part of ISO 11452 are limited to continuous narrowband electromagnetic fields. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only

20、the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 11452-1:2005, Road vehicles Component test methods for electrical disturbances from narrowband radiated electromagnetic energy Part 1: General principles and termi

21、nology 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 11452-1 apply. 4 Test conditions The applicable frequency ranges of the BCI and the TWC test methods are direct functions of the transducer characteristics (current probe or tubular wave coupler)

22、. More than one type of transducer may be required. To test automotive electronic systems, the typical applicable frequency range of the BCI test method is 1 MHz to 400 MHz, of the TWC test method is 400 MHz to 3 GHz. ISO 2011 All rights reserved 1NOTE Current probes and tubular wave couplers are av

23、ailable which allow testing outside these frequency ranges. The users shall specify the test severity level(s) over the frequency range. Suggested test levels are included in Annex E. Standard test conditions are given in ISO 11452-1 for the following: test temperature; supply voltage; modulation; d

24、well time; frequency step sizes; definition of test severity levels; test signal quality. 5 Test location The tests shall be performed in a shielded enclosure. 6 Test instrumentation 6.1 BCI test method 6.1.1 General BCI is a method of carrying out immunity tests by inducing disturbance signals dire

25、ctly into the wiring harness by means of a current injection probe. The injection probe is a current transformer through which the wiring harnesses of the device under test (DUT) are passed. Immunity tests are carried out by varying the test severity level and frequency of the induced disturbance. T

26、he following equipment is used: ground plane; current injection probe(s); current measurement probe(s); artificial network(s) AN(s); radio frequency (RF) generator with internal or external modulation capability; power amplifier; power measuring instrumentation to measure the forward and reverse pow

27、er; current measurement equipment. 6.1.2 Injection probe An injection probe or set of probes capable of operating over the test frequency range is required to couple the test signal to the DUT. The probe(s) shall be capable of withstanding the necessary input power for the maximum test level over th

28、e test frequency range regardless of the test set-up loading. Saturation of the injection probe should be taken into consideration in establishing the test levels. ISO 11452-4:2011(E)2 ISO 2011 All rights reserved6.1.3 Current measurement probe The current measurement probe or set of probes shall be

29、 capable of operating over the test frequency range. 6.1.4 Stimulation and monitoring of the DUT The DUT shall be operated as required in the test plan by actuators which have a minimum effect on the electromagnetic characteristics, e.g. plastic blocks on the push-buttons, pneumatic actuators with p

30、lastic tubes. Connections to equipment monitoring electromagnetic interference reactions of the DUT may be accomplished by using fibre-optics, or high-resistance leads. Other type of leads may be used but require extreme care to minimize interactions. The orientation, length and location of such lea

31、ds shall be carefully documented to ensure repeatability of test results. Any electrical connection of monitoring equipment to the DUT may cause malfunctions of the DUT. Extreme care shall be taken to avoid such an effect. 6.2 TWC test method 6.2.1 General The approach of this test method is an equi

32、valent coupling to a plane wave coupling into a wiring harness of automotive components. To realize this, a short 50 coaxial line configuration with open ends, an inner tube- shaped conductor and matched terminations are used to generate a transverse electromagnetic (TEM) wave inside. The wiring har

33、ness leads through the inner conductor of the wave coupler. This leads to two disturbing components for the DUT: a TEM wave component coupled via the cable, and a radiated component, caused by the scattering field from the primary TEM wave in the connecting cable between the coupler and the DUT. The

34、 following equipment is used: ground plane; tubular wave coupler; artificial networks(s) AN(s); RF generator with internal or external modulation capability; power amplifier; power measuring instrumentation to measure the forward and reverse power. 6.2.2 Tubular wave coupler A tubular wave coupler i

35、s used to couple the disturbances into the test wiring harness. It shall be capable of coupling the test power over the test frequency range into the wiring harness and shall have a sufficiently high coupling and power rating. 6.2.3 50 load resistor A 50 load resistor is used to match the output of

36、the tubular wave coupler. The power rating shall be equal or greater than the applied forward power. 6.2.4 Stimulation and monitoring of the DUT See 6.1.4. ISO 11452-4:2011(E) ISO 2011 All rights reserved 37 Test set-up 7.1 Ground plane The ground plane shall be made of 0,5 mm thick (minimum) copper

37、, brass or galvanized steel. The minimum width of the ground plane shall be 1 000 mm. The minimum length of the ground plane shall be 1 500 mm for the BCI method using the closed-loop method with power limitation, 2 000 mm for all other methods defined in this part of ISO 11452, or underneath the en

38、tire equipment plus 200 mm, whichever is larger. The ground plane shall be bonded to the walls or the floor of the shielded enclosure such that the d.c. resistance shall not exceed 2,5 m . The distance from the edge of the ground strap to the edge of the next strap shall not be greater than 300 mm.

39、The maximum length to width ratio for the ground straps shall be 7:1. 7.2 Power supply and AN Each DUT power supply lead shall be connected to the power supply through an AN. Power supply is assumed to be negative ground. If the DUT utilizes a positive ground then the test set-ups shown in the figur

40、es need to be adapted accordingly. Power shall be applied to the DUT via 5 H/50 AN (see Annex C for artificial network schematic). Requirements vary depending on the intended DUT installation in the vehicle. For a DUT remotely grounded (vehicle power return line longer than 200 mm), two ANs are requ

41、ired, one for the positive supply line and one for the power return line (see Annex D). For a DUT locally grounded (vehicle power return line 200 mm or shorter), one AN is required for the positive supply (see Annex D). The AN(s) shall be mounted directly on the ground plane. The case(s) of the AN(s

42、) shall be bonded to the test bench ground plane. The power supply return shall be connected to the test bench ground plane between the power supply and the AN(s). The measuring port of each AN shall be terminated with a 50 load which is capable of dissipating the coupled RF power. 7.3 Location of t

43、he DUT The DUT shall be placed on a non-conductive, low relative permittivity (dielectric constant) material ( r 1,4), at (50 5) mm above the metallic surface of the table. The case of the DUT shall not be grounded to the metallic surface of the table unless it is grounded in the actual vehicle. The

44、 face of the DUT shall be located at least 100 mm from the edge of the ground plane. There should be a distance at least 500 mm between the DUT and any metal part such as the walls of the shielded room, with the exception of the ground plane on which the DUT is placed. ISO 11452-4:2011(E)4 ISO 2011

45、All rights reserved7.4 Length and location of the test harness Unless otherwise specified in the test plan, the length of test harness between the DUT and the load simulator shall be: for all test methods defined in this part of ISO 11452 except for the BCI test method using the closed-loop method w

46、ith power limitation; for the BCI test method using the closed-loop method with power limitation. The wiring type is defined by the actual system application and requirement. The wiring harness shall be straight: over at least 1 400 mm starting at the DUT for all test methods defined in this part of

47、 ISO 11452 except for the BCI test method using the closed-loop method with power limitation; over its entire length for the BCI test method using the closed-loop method with power limitation. The wiring harness should be fixed (position and number of wires). The wiring harness should pass through t

48、he current injection and current measurement probes or the tubular wave coupler. The length of the wires in the load simulator should be short by comparison with the length of the harness. The wires within the load simulator should be fixed. NOTE If all wires in the load simulator and the wiring har

49、ness have the same lengths, strong resonance effects might occur. This can be avoided by using or adding wires of different lengths in the load simulator. The test harness (or each branch) shall be placed on a non-conductive, low relative permittivity (dielectric constant) material ( r 1,4), with a thickness of (50 5) mm. For DUTs with multiple harness branches, the branches not