Standard No.:	GB/T 18655-2018
English Name:	Vehicles,boats and internal combustion engines-Radio disturbance characteristics-Limits and methods of measurement for the protection of on-board receivers
Chinese Name:	车辆、船和内燃机 无线电骚扰特性 用于保护车载接收机的限值和测量方法
Chinese Classification:	L06    Electromagnetic compatibility
Professional Classification:	GB    National Standard
Issued by:	SAIC AND SAC
Issued on:	2018-07-13
Implemented on:	2019-2-1
Status:	valid
Superseding:	GB/T 18655-2010 Vehicles boats and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of on-board receivers
Language:	English
File Format:	PDF
Word Count:	58500 words
Price(USD):	300.0
Delivery:	via email in 1 business day

1 Scope This standard contains limits and procedures for the measurement of radio disturbances in the frequency range of 150kHz~2500MHz. This standard applies to any electronic/electrical component intended for use in vehicles, trailers and devices. Refer to International Telecommunications Union (ITU) publications and the actual application conditions in China for details of frequency allocations. The limits are intended to provide protection for receivers installed in a vehicle from disturbances produced by components/modules in the same vehicle. The method and limits for a complete vehicle (whether connected to the power mains for charging purposes or not) are in Clause 5 and the methods and limits for components/modules are in Clause 6. Only a complete vehicle test may be used to determine the component compatibility with respect to a vehicle’s limit. The receiver types to be protected are, for example, broadcast receivers (sound and television), land mobile radio, radio telephone, amateur, citizens' radio, Satellite Navigation (Beidou, GPS etc.), Wi-Fi and Bluetooth. For the purpose of this standard, a vehicle is a machine, which is self-propelled by an internal combustion engine, electric means, or both. Vehicles include (but are not limited to) passenger cars, trucks, agricultural tractors and snowmobiles. Annex A provides guidance in determining whether this standard is applicable to particular equipment. This standard does not include protection of electronic control systems from radio frequency (RF) emissions or from transient or pulse-type voltage fluctuations. These subjects are included in publications of the Standardization Administration. The limits in this standard are recommended and subject to modification as agreed between the vehicle manufacturer and the component supplier. This standard is also intended to be applied by manufacturers and suppliers of components and equipment which are to be added and connected to the vehicle harness or to an on-board power connector after delivery of the vehicle. Since the mounting location, vehicle body construction and harness design may affect the coupling of radio disturbances to the on-board receiver, Clause 6 of this standard defines multiple limit levels. The level class to be used (as a function of frequency band) is agreed upon between the vehicle manufacturer and the component supplier. This standard defines test methods for use by vehicle manufacturers and suppliers, to assist in the design of vehicles and components and ensure controlled levels of on-board radio frequency emissions. Vehicle test limits are provided for guidance and are based on a typical radio receiver using the antenna provided as part of the vehicle, or a test antenna if a unique antenna is not specified. The frequency bands that are defined are not applicable to all regions or countries of the world. For economic reasons, the vehicle manufacturer is free to identify what frequency bands are applicable to the radio services likely to be used in that vehicle. As an example, many vehicle models will probably not have a television receiver installed; yet the television bands occupy a significant portion of the radio spectrum. Testing and mitigating noise sources in such vehicles is not economically justified. The World Administrative Radio communications Conference (WARC) lower frequency limit in region 1 was reduced to 148.5kHz in 1979. For vehicular purposes, tests at 150kHz are considered adequate. Annex E defines artificial networks used for the measurement of conducted disturbances and for tests on vehicles in charging mode. Annex H defines a qualitative method of judging the degradation of radio communication in the presence of impulsive noise. Annex I defines test methods for shielded power supply systems for high voltage networks in electric and hybrid vehicles. Annex J defines methods for the validation of the ALSE used for component testing. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 4365-2003 Electrotechnical terminology--Electromagnetic compatibility (idt IEC 60050-161:1990+A1:1997+A2:1998) GB/T 6113.104-2016 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-4: Radio disturbance and immunity measuring apparatus - Antennas and test sites for radiated disturbances measurements (CISPR 16-1-4: 2012, IDT) GB/T 6113.203-2016 Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-3:Methods of measurement of disturbances and immunity - Radiated disturbance measurements (CISPR 16-2-3: 2010, IDT) GB/T 29259-2012 Road vehicle - Electromagnetic compatibility terminology ISO 7637-3: 2016 Road vehicles - Electrical disturbances from conduction and coupling - Part 3: Electrical transient transmission by capacitive and inductive coupling via lines other than supply lines ISO 11452-4: 2011 Road vehicles - Component test methods for electrical disturbances from narrowband radiated electromagnetic energy - Part4: Harness excitation methods CISPR 16-1-1: 2015 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-1: Radio disturbance and immunity measuring apparatus - Measuring apparatus CISPR 16-1-2: 2014 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-2: Radio disturbance and immunity measuring apparatus - Coupling devices for conducted disturbance measurements CISPR 16-2-1: 2014 Specificationforradiodisturbanceandimmunitymeasuringapparatusandmethods - Part 2-1: Methods of measurement of disturbance sand immunity - Conducted disturbance measurements SAE ARP 958.1 Rev D: 2003-02 Electromagnetic interference measurement antennas - Standard calibration method 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 4365-2003 and GB/T 29259-2012 and the following apply. 3.1 artificial mains network; AMN network that provides a defined impedance to the EUT at radio frequencies, couples the disturbance voltage to the measuring receiver and decouples the test circuit from the supply mains

Foreword i Introduction iii 1 Scope 2 Normative references 3 Terms and definitions 4 Requirements common to vehicle and component/module emissions measurements 4.1 General test requirements 4.2 Shielded enclosure 4.3 Absorber-lined shielded enclosure (ALSE) 4.4 Measuring equipment 4.5 Power supply 5 Measurement of emissions received by an on-board antenna 5.1 Antenna measuring system 5.2 Method of measurement 5.3 Test setup for vehicle in charging mode 5.4 Examples of limits for vehicle radiated disturbances 6 Measurement of components and modules 6.1 General 6.2 Test equipment 6.3 Conducted emissions from components/modules - voltage method 6.4 Conducted emissions from components/modules - Current probe method 6.5 Radiated emissions from components/modules - ALSE method 6.6 Radiated emissions from components/modules - TEM cell method 6.7 Radiated emissions from components/modules - Strip line method Annex A (Informative) Flow Chart for Checking the Applicability of This Standard Annex B (Normative) Antenna matching unit – Vehicle test Annex C (Informative) Sheath-current suppressor Annex D (Informative) Guidance for the determination of the noise floor of active vehicle antennas in the AM and FM range Annex E (Normative) Artificial networks (AN), artificial mains networks (AMN) and asymmetric artificial networks (AAN) Annex F (Informative) Radiated emissions from components/modules – TEM cell method Annex G (Informative) Radiated emissions from components/modules – Stripline method Annex H (Informative) Interference to mobile radio communication in the presence of impulsive noise - Methods of judging degradation Annex I (Normative) Test methods for shielded power supply systems for high voltages in electric and hybrid vehicles Annex J (Informative) ALSE performance validation 150kHz to 1GHz Bibliography Figure 1 Method of determination of conformance for all frequency bands Figure 2 Example of gain curve Figure 3 Vehicle-radiated emissions – Example for test layout (view with monopole antenna) Figure 4 Example of test setup for vehicle with plug located on vehicle side (AC powered without communication) Figure 5 Example of test setup for vehicle with plug located front/rear of vehicle (AC powered without communication) Figure 6 Example of test setup for vehicle with plug located on vehicle side (AC or DC powered with communication) Figure 7 Example of test setup for vehicle with plug located front/rear of vehicle (AC or DC powered with communication) Figure 8 Average limit for radiated disturbance from vehicles at GPS band Figure 9 Conducted emissions - Example of test setup for EUT with power return line remotely grounded Figure 10 Conducted emissions - Example of test setup for EUT with power return line locally grounded Figure 11 Conducted emissions - Example of test setup for generators Figure 12 Conducted emissions - Example of test setup for ignition system components Figure 13 Conducted emissions - Example of test setup for current probe measurements Figure 14 Test harness bending requirements Figure 15 Example of test setup - Monopole antenna Figure 16 Example of test setup - Biconical antenna Figure 17 Example of test setup - Log-periodic antenna Figure 18 Example of test setup - Above 1GHz Figure 19 Example of average limit for radiated disturbances from components/modules Figure A.1 Flow chart for checking the applicability of this standard Figure B.1 Verification setup Figure C.1 Characteristic curve S21 of the ferrite core Figure D.1 Vehicle test setup for equipment noise measurement in the AM/FM range Figure D.2 Vehicle test setup for antenna noise measurement in the AM/FM range Figure E.1 Example of 5µH artificial networks (AN) schematic Figure E.2 Impedance characteristics ZPB of the artificial networks (AN) Figure E.3 Example of 5μH HV-artificial networks (HV-AN) schematic Figure E.4 Example of multiple 5μH HV-artificial networks (HV-AN) in a single shielded box Figure E.5 Impedance matching network attached between HV-AN and EUT Figure E.6 Example of ANN applicable to symmetric communication lines Figure E.7 Example of ANN circuit of PLC on AC or DC power supply lines Figure E.8 Example of ANN circuit for PLC on pilot line Figure F.1 TEM cell (example) Figure F.2 Example of setup of leads in the TEM cell and to the connector panel Figure F.3 Example of the setup of the connectors, wiring board and insulating support Figure F.4 Example of the required minimum attenuation of the signal/control lines Figure F.5 Setup for measurement of the filter attenuation Figure F.6 Example of the TEM cell method test setup Figure F.7 TEM cell Figure G.1 Example of stripline test setup in a shielded enclosure Figure G.2 Example of 50Ω stripline Figure G.3 Example of 90Ω stripline Figure I.1 Conducted emission - Example of test setup for EUTs with shielded power supply systems Figure I.2 Conducted emission - Example of test setup for EUTs with shielded power supply systems with electric motor attached to the bench Figure I.3 Conducted emission - Example of inverter test setup with shielded power supply systems Figure I.4 Conducted emission - Example of charger test setup with shielded power supply systems Figure I.5 Conducted emission - Example of test setup current probe measurement on HV lines for EUTs with shielded power supply systems Figure I.6 Conducted emission - Example of test setup current probe measurement on HV lines for EUTs with shielded power supply systems with electric motor attached to the bench Figure I.7 Conducted emission - Example of test setup current probe measurement on HV lines for EUTs with shielded power supply systems and inverter Figure I.8 Conducted emission - Example of test setup current probe measurement on HV lines for EUTs with shielded power supply systems and charger device Figure I.9 Radiated emission - Example of test setup measurement with biconical antenna for EUTs with shielded power supply systems Figure I.10 Radiated emission - Example of test setup measurement with biconical antenna for EUTs with shielded power supply systems with electric motor attached to the bench Figure I.11 Radiated emission - Example of test setup measurement with biconical antenna for EUTs with shielded power supply systems and inverter Figure I.12 Radiated emission - Example of test setup measurement with biconical antenna for EUTs with shielded power supply systems and charger device Figure I.13 Test setup for calibration of the test signal Figure I.14 Example of test setup for conducted emissions - Voltage method - Measurement on LV ports with injection on HV supply ports Figure I.15 Example of test setup for conducted emissions – Current probe method – Measurement on LV ports with injection on HV supply ports Figure I.16 Example of test setup for radiated emissions – ALSE method – Measurement on LV ports with injection on HV supply ports with with biconical antenna Figure I.17 Test setup for EUT S21 measurements Figure I.18 Examples of requirements for coupling attenuation, ac Figure J.1 Examples of typical ALSE influence parameters over the 10MHz to 100MHz frequency range Figure J.2 Visual representation of ALSE performance validation process Figure J.3 Example of construction of a transmitting monopole Figure J.4 Side view of the antenna configuration for reference measurement below 30MHz Figure J.5 Top view of antenna configuration for reference measurement 30MHz and above (with the biconical antenna shown as example) Figure J.6 Side view of antenna configuration for reference measurement 30MHz and above (with the biconical antenna shown as example) Figure J.7 Top view of antenna configuration for the ALSE measurement below 30MHz Figure J.8 Metallic sheet angles used as support for the rod Figure J.9 Radiator side view 50Ω terminations Figure J.10 Photo of the radiator mounted on the ground reference plane Figure J.11 Example VSWR measured from four radiation sources (without 10dB attenuator) Figure J.12 Example setup for ALSE equivalent field strength measurement (monopole antenna shown for the frequency range below 30MHz) Figure J.13 MoM-model for the frequency range 30MHz to 200MHz Table 1 Spectrum analyzer parameters Table 2 Scanning receiver parameters Table 3 Antenna types Table 4 Example for limits of disturbance Table 5 Examples of limits for conducted disturbances - Voltage method Table 6 Examples of limits for conducted disturbances - Current probe method Table 7 Examples of limits for radiated disturbances from components/modules - ALSE method Table E.1 Impedance (ZPB) values of artificial networks (AN) Table F.1 Radiated disturbance limits – TEM cell method Table F.2 Dimensions for TEM cells Table G.1 Example of limits of radiated disturbances – Stripline method Table I.1 Example for HV limits for conducted voltage measurements at shielded power supply devices (HV-LV decoupling class A5) Table I.2 Example of configurations for equipment without negative LV line Table I.3 Example of configurations for equipment with negative LV line Table I.4 Examples of requirements for minimum coupling attenuation, ac Table J.1 Reference data to be used for ALSE validation