Standard No.:	GB/T 18655-2025
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
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2025-02-28
Implemented on:	2025-2-28
Status:	valid
Superseding:	GB/T 18655-2018 Vehicles,boats and internal combustion engines-Radio disturbance characteristics-Limits and methods of measurement for the protection of on-board receivers
Target Language:	English
File Format:	PDF
Word Count:	76500 words
Translation Price(USD):	2295.0
Delivery:	via email in 1 business day

GB/T 18655-2025 Vehicles, boats and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of on-board receivers English 1 Scope This document contains limits and procedures for the measurement of radio disturbances in the frequency range of 150 kHz to 5 925 MHz. This document is applicable to vehicles, boats, trailers, internal combustion engine driven equipment and any electronic/electrical component intended for use in vehicles, boats, trailers and combustion engine driven equipment. The details of frequency distribution in this document refer to International Telecommunication Union (ITU) publications and practical applications in China. The limits in this document are intended to provide protection for on-board receivers installed in a vehicle from disturbances produced by components/modules in the same vehicle. 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, V2X, and Bluetooth. This document 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 other Standardization Committee publications. The limits in this document are recommended and subject to modification as agreed between the vehicle manufacturer and the component supplier. This document is also applicable to parts and equipment that vehicle manufacturers and component and equipment suppliers add and connect to the vehicle harness or to an on-board power connector after delivery of the vehicle. This document 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. The emission requirements in this document are not intended to be applicable to the intentional transmissions from a radio transmitter as defined by the ITU including their spurious emissions. Note 1: This exclusion is only applicable to emissions generated by intentional transmitters, which are coupled to the wiring harness of the EUT in the form of radiated emissions during testing setup. For conducted transmissions on frequencies intentionally produced by the radio part of an EUT, this exclusion does not apply. Note 2: It is usual for customers and suppliers to use radio regulation standards to manage the effect of spurious emissions from a radio transmitter unless limits of spurious emission are agreed in the test plan. Note 3: See Annex A for the suitability inspection process. 2 Normative references The following documents contain provisions which, through reference in this text, constitute provisions 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 1002 Single phase plugs and socket-outlets for household and similar purposes - Types, basic parameters and dimensions GB/T 2099.1 Plugs and socket-outlets for household and similar purposes - Part 1: General requirements (GB/T 2099.1-2021, IEC 60884-1:2013, MOD) GB/T 4365-2024 Electrotechnical terminology - Electromagnetic compatibility (IEC 60050-161:2021, MOD) GB/T 6113.101 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-1: Radio disturbance and immunity measuring apparatus - Measuring apparatus (GB/T 6113.101-2021, CISPR 16-1-1:2019, IDT) GB/T 6113.102-2018 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 16-1-2:2014, IDT) GB/T 9254.1-2021 Information technology equipment, multimedia equipment and receivers - Electromagnetic compatibility - Part 1: Emission requirements (CISPR 32:2015, MOD) GB/T 19596-2017 Terminology of electric vehicles GB/T 29259-2012 Road vehicle - Electromagnetic compatibility terminology GB/T 44119 Measurement method of antenna factor for 1 m method radiated disturbance 3 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 4365-2024, GB/T 19596-2017 and GB/T 29259-2012 and the following apply. 3.1 antenna matching unit device used to form/realize impedance matching with a measuring instrument with impedance of 50Ω within the antenna measurement frequency range [Source: GB/T 29259-2012, 3.66] 3.2 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 power supply Note 1: There are two basic types of AMN, the V-network (V-AMN) which couples the unsymmetrical voltages, and the delta-network which couples the symmetric and the asymmetric voltages separately. Note 2: Network inserted in the power mains of the vehicle in charging mode or of a component (e.g. charger) which provides, in a given frequency range, a specified load impedance and which isolates the vehicle / component from the power mains in that frequency range. 3.3 artificial network; AN network inserted in the power line or signal/load lead of apparatus to be tested which provides, in a given frequency range, a specified load impedance for the measurement of disturbance voltages and which can isolate the apparatus from the supply or signal sources/loads in that frequency range Note: Network inserted in the DC power lines of the vehicle in charging mode which provides, in a given frequency range, a specified load impedance and which isolates the vehicle from the DC power supply in that frequency range. [Source: GB/T 29259-2012, 3.52, modified] 3.4 asymmetric artificial network; AAN network used to measure (or inject) asymmetric (common mode) voltages on unshielded symmetric signal (e.g. telecommunication) lines while rejecting the symmetric (differential mode) signal Note: This network is inserted in the communication/signal lines of the vehicle in charging mode or of a component (e.g. charger) to provide a specific load impedance and/or a decoupling (e.g. between communication/signal lines and power mains). 3.5 bandwidth 3.5.1 bandwidth of an equipment width of a frequency band over which a given characteristic of an equipment or transmission channel does not differ from its reference value by more than a specified amount or ratio Note: The given characteristic may be, for example, the amplitude/frequency characteristic, the phase/frequency characteristic or the delay/frequency characteristic. [Source: GB/T 29259-2012, 3.18.1, modified] 3.5.2 bandwidth of signal width of the frequency band outside which the level of any spectral component does not exceed a specified percentage of a reference level [Source: GB/T 29259-2012, 3.18.2] 3.6 boat vessel intended to be used on the surface of water, its length being no greater than 15 m [Source: GB 14023-2012, 3.2] 3.7 bonded grounding connection with a DC resistance not exceeding 2.5 m Ω and that provides the lowest possible impedance (resistance and inductance) connection between two metallic parts Note: A low current (≤100 mA) 4-wire milliohm meter is recommended for this measurement. 3.8 broadband emission emission which has a bandwidth greater than that of a particular measuring equipment or receiver. An emission which has a pulse repetition rate less than the bandwidth of a measuring instrument can also be considered as a broadband emission [Source: GB/T 29259-2012, 3.22] 3.9 charging mode method for connecting an electric vehicle to the supply network (mains) so as to supply power to the electric vehicle Note: Mode 1, Mode 2, Mode 3, Mode 4 are also suitable for charging and discharging. [Source: GB/T 18487.1-2023, 3.1.4] 3.9.1 charging mode 1 mode in which plugs and sockets meeting the requirements of GB/T 2099.1 and GB/T 1002 are used on the power supply side, and phase wires, neutral wires and grounding protection conductors are used in the power supply measurement when the electric vehicle is connected to the AC supply network (mains) Note: In some countries, mode 1 charging is prohibited or requires special precautions. [Source: GB/T 18487.1-2023, 3.1.4.1, modified] 3.9.2 charging mode 2 mode in which a standard plug/socket-outlet, as well as phase line, neutral line and protective ground conductor are used on the power supply side, and an in-cable control and protection device (IC-CPD) is used in charging connection when an electric vehicle is connected to the AC supply network (mains) [Source: GB/T 18487.1-2023, 3.1.4.2, modified] 3.9.3 charging mode 3 mode in which special power supply equipment is used to connect the electric vehicle directly with the AC power grid, and a control and guide device is installed on the special power supply equipment when the electric vehicle is connected to the AC supply network (mains) [Source: GB/T 18487.1-2023, 3.1.4.3, modified] 3.9.4 charging mode 4 mode in which a DC energy transfer equipment with control pilot function is used when an electric vehicle is connected to the supply network (mains) [Source: GB/T 18487.1-2023, 3.1.4.4, modified] 3.10 class performance level agreed upon by the purchaser and the supplier and documented in the test plan 3.11 compression point signal level when the measurement system begins to become a nonlinear system in case that the output value of the system will deviate from the theoretical value of the ideal linear system [Source: GB/T 29259-2012, 3.68] 3.12 device machine driven by an internal combustion engine which is not primarily intended to carry persons or goods Note: Devices include, but are not limited to, chainsaws, irrigation pumps, snow blowers, air compressors, walkbehind floor treatment machines and landscaping equipment. [Source: GB 14023-2012, 3.3] 3.13 equipment under test; EUT vehicle, boat, device, component, module or internal combustion engine within this document 3.14 high voltage; HV operating DC voltage between 60 V to 1 500 V Note: The term high voltage can be defined with a different voltage range in other standards. 3.15 high voltage artificial network; HV-AN network inserted in the high voltage DC power line of apparatus to be tested which provides, in a given frequency range, a specified load impedance for the measurement of disturbance voltages and which can isolate the apparatus from the supply in that frequency range 3.16 direct current charging artificial network; DC-charging-AN network inserted in the high voltage DC lead of vehicle in charging mode which provides, in a given frequency range, a specified load impedance and which can isolate the vehicle from the HV DC charging station in that frequency range 3.17 low voltage; LV operating DC voltage below 60 V, e.g. nominal voltages of 12 V, 24 V or 48 V Note: The term "low voltage" can be defined with a different voltage range in other standards. 3.18 measurement time effective, coherent time for a measurement result at a single frequency ——for the peak detector, the effective time to detect the maximum of the signal envelope; ——for the quasi-peak detector, the effective time to measure the maximum of the weighted envelope,

Foreword i Introduction iv 1 Scope 2 Normative references 3 Terms and definitions 4 General requirements for measurement of vehicle and component / module emissions 4.1 General test requirements 4.2 Shielded room 4.3 Absorber-lined shielded enclosure (ALSE) 4.4 Measuring instrument 4.5 Power supply 5 Measurement of emissions received by vehicle antenna 5.1 General 5.2 Antenna measuring system 5.3 Method of measurement 5.4 Test setup for vehicle in charging mode 5.5 Examples of limits for vehicle radiated disturbances 6 Measurement of components and modules 6.1 General requirements 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 – Stripline method Annex A (Informative) Flow chart for checking the applicability of this document to vehicles and boats 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 Annex E (Normative) Artificial Network (AN), High Voltage Artificial Network (HV-AN), Direct Current charging Artificial Network (DC-charging-AN), Artificial Mains Network (AMN) and Asymmetric Artificial Network (AAN) Annex F (Informative) Radiated emissions from components/modules – Stripline method Annex G (Informative) Interference to mobile radio communication in the presence of impulsive noise – Methods of judging degradation Annex H (Normative) Test methods for power supply systems for high voltages in electric and hybrid vehicles Annex I (Informative) ALSE performance validation 150 kHz to 1 GHz Annex J (Informative) Measuring equipment uncertainty – measurement of emissions received by vehicle antenna Annex K (Informative) Uncertainty budget for measurement of emissions received by vehicle antenna Annex L (Informative) Measuring equipment uncertainty – Emissions from components/modules – Test method Annex M (Informative) Typical uncertainty budget for emissions from components/modules Bibliography