GB/T 18655-2025 PDF English
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| GB/T 18655-2025 | English | 2300 |
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Vehicles, boats and internal combustion engines - Radio disturbance characteristics - Limits and methods of measurement for the protection of on-board receivers
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| GB/T 18655-2018 | English | 305 |
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Vehicles, boats and internal combustion engines -- Radio disturbance characteristics -- Limits and methods of measurement for the protection of on-board receivers
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| GB/T 18655-2010 | English | 170 |
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Vehicles, boats and internal combustion engines -- Radio disturbance characteristics -- Limits and methods of measurement for the protection of on-board receivers
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| GB 18655-2002 | English | 270 |
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Limits and methods of measurement of radio disturbance characteristics for the protection of receivers used on board vehicles
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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
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT18655-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 33.100
CCS L 06
Replacing 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
(CISPR 25.2021, MOD)
Issued on: FEBRUARY 28, 2025
Implemented on: FEBRUARY 28, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 4
Introduction... 8
1 Scope... 10
2 Normative references... 11
3 Terms and definitions... 12
4 Requirements common to vehicle and component module emissions measurement... 19
4.1 General test requirements... 19
4.2 Shielded enclosure... 22
4.3 Absorber-lined shielded enclosure (ALSE)... 22
4.4 Measuring instrument... 23
4.5 Power supply... 28
5 Measurement of emissions received by an antenna on the same vehicle... 30
5.1 General... 30
5.2 Antenna measuring system... 30
5.3 Method of measurement... 32
5.4 Test setup for vehicle in charging mode... 35
5.5 Examples of limits for vehicle radiated disturbances... 44
6 Measurement of components and modules... 50
6.1 General... 50
6.2 Test equipment... 50
6.3 Conducted emissions from components/modules – Voltage method... 52
6.4 Conducted emissions from components/modules – current probe method... 60
6.5 Radiated emissions from components/modules – ALSE method... 63
6.6 Radiated emissions from components/modules – Stripline method... 80
Annex A (informative) Flow chart for checking the applicability of this document to
vehicles and boats... 81
Annex B (normative) Antenna matching unit – Vehicle test... 82
Annex C (informative) Sheath-current suppressor... 84
Vehicles, boats and internal combustion engines - Radio
disturbance characteristics - Limits and methods of
measurement for the protection of on-board receivers
1 Scope
This document contains limits and procedures for the measurement of radio
disturbances in the frequency range of 150 kHz ~ 5 925 MHz. This document applies
to vehicles, boats, trailers, internal combustion engines-driven devices and any
electronic/electrical component intended for use in vehicles, boats, trailers and devices.
The details of frequency distribution in this document refer to the International
Telecommunications Union (ITU) publications and actual applications in China. The
limits 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 are included in other
standardization committee publications.
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.For the flow chart for checking the applicability, see Annex A.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements 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 following terms and definitions, as well as those
given in GB/T 4365-2024, GB/T 19596-2017, GB/T 29259-2012, apply.
3.1
antenna matching unit
unit for matching the impedance of an antenna to that of the 50 Ω measuring instrument
over the antenna measuring 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
supply mains
4 Requirements common to vehicle and component module emissions measurement
4.1 General test requirements
4.1.1 Categories of disturbance sources (as defined in the test plan)
Electromagnetic disturbance sources can be divided into two main types.
-- narrowband sources (examples of narrowband disturbance sources are vehicle
electronic components which include clocks, oscillators, digital logic from
microprocessors and displays);
-- broadband sources (examples of broadband disturbance sources are electrical
motors and ignition system).
4.1.2 Test plan
A test plan shall be established for each item to be tested. The test plan shall specify the
frequency range to be tested, the emissions limits, antenna types and locations, test
report requirements, supply voltage and other relevant parameters, including EUT
operating conditions (as described in 4.1.4).
The test plan shall define for each frequency band whether the conformance can be
obtained with average and peak limits or with average and quasi-peak limits.
5 Measurement of emissions received by an antenna on the same vehicle
5.1 General
The test shall be performed in an ALSE.
5.2 Antenna measuring system
5.2.1 Type of antenna
An antenna of the type to be supplied with the vehicle shall be used as the measurement
antenna for the bands for which it is designed to be used for radio reception.
If no antenna is installed on the vehicle (as is often the case for mobile radio systems),
the test shall be carried out using the antenna given in Table 3.The antenna type and
location shall be included in the test plan.
If an active antenna is used, the noise floor of the measured signal at the radio antenna
connector can increase (see also the note in 5.5).
6 Measurement of components and modules
6.1 General
Since the mounting location, vehicle body construction and harness design can affect
the coupling of radio disturbances to the on-board radio, this clause 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.
For LV components, test methods and requirements are defined in this clause.
For LV/HV components, additional test methods and limits are defined in Annex H.
6.2 Test equipment
6.2.1 Reference ground plane
The reference ground plane shall be defined as the top metallic surface of the test
bench/table.
The reference ground plane shall be made of 0.5 mm thick (minimum) copper, brass,
bronze or galvanized steel.
The minimum size of the reference ground plane for conducted emissions (voltage
method) shall be 1 000 mm × 400 mm.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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