Standard No.:	GB 4824-2025
English Name:	Industrial, scientific and medical equipment—Radio-frequency disturbance characteristics—Limits and methods of measurement
Chinese Name:	工业、科学和医疗设备 射频骚扰特性 限值和测量方法
Chinese Classification:	L06    Electromagnetic compatibility
Professional Classification:	GB    National Standard
Source Content Issued by:	SAMR; SAC
Issued on:	2025-02-28
Implemented on:	2026-3-1
Status:	to be valid
Superseding:	GB 4824-2019 Industrial,scientific and medical equipment—Radio-frequency disturbance characteristics—Limits and methods of measurement
Target Language:	English
File Format:	PDF
Word Count:	37500 words
Translation Price(USD):	1125.0
Delivery:	via email in 1 business day

GB 4824-2025 Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement 1 Scope This document applies to industrial, scientific and medical electrical equipment operating in the frequency range 0 Hz to 400 GHz and to domestic and similar appliances designed to generate and/or use locally radio-frequency energy. This document covers emission requirements related to radio-frequency (RF) disturbances in the frequency range of 9 kHz to 400 GHz. For ISM RF applications in the meaning of the definition found in the ITU Radio Regulations (2020) (see Definition 3.1.18), this document covers emission requirements related to radio-frequency disturbances in the frequency range of 9 kHz to 18 GHz. ISM equipment which incorporates radio transmit/receive functions (host equipment with radio functionality) is included in the scope of this document, see Annex F. However, 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 only applies to emissions from the intentional radio transmitter. However, combination emissions, for example emissions resulting from intermodulation between the radio and the non-radio subassemblies of the ISM equipment, are not subject to this exclusion. Note 2: Emission requirements for induction cooking appliances are specified in GB 4343.1. Requirements for ISM RF lighting equipment and UV irradiators operating at frequencies within the ISM frequency bands defined by the ITU Radio Regulations are contained in this document Robots used for industrial, scientific and medical applications are in the scope of this document. Example: Welding robots, spraying robots, handling robots, processing robots, assembly robots, medical robots, education and experimental robots. A comprehensive list of robots in the scope of this document is given on the IEC EMC zone. Note 3: Flying robots, domestic helper robots, toy robots and entertainment robots are examples of robots in the scope of other CISPR standards. Equipment covered by other CISPR product and product family emission standards are excluded from the scope of this document. 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/T 4365-2024 Electrotechnical terminology - Electromagnetic compatibility (IEC 60050-161:2021, MOD) Note: There is no technical difference between the referenced content from GB/T 4365-2024 and that from IEC 60050-161:2021. GB/T 6113.101-2021 Specification for radio disturbance and immunity measuring apparatus and methods - Part 1-1: Radio disturbance and immunity measuring apparatus - Measuring apparatus (CISPR 16-1-1:2019, IDT) GB/T 6113.402-2022 Specification for radio disturbance and immunity measuring apparatus and methods - Part 4-2: Uncertainties, statistics and limit modelling - Measurement instrumentation uncertainty (CISPR16-4-2: 2018, IDT) IEC 60601-2-2:2017 Medical electrical equipment - Part 2-2: Particular requirements for the basic safety and essential performance of high frequency surgical equipment and high frequency surgical accessories Note: GB 9706.202-2021 Medical electrical equipment - Part 2-2: Particular requirements for the basic safety and essential performance of high frequency surgical equipment and high frequency surgical accessories (GB 9706.202-2021, IEC 60601-2-2:2017, MOD) IEC 61000-4-6:2023 Electromagnetic compatibility (EMC) - Part 4-6: Testing and measurement techniques - Immunity to conducted disturbances, induced by radio-frequency fields Note: GB/T 17626.6-2017 Electromagnetic compatibility - Testing and measurement techniques - Immunity to conducted disturbances induced by radio-frequency fields (IEC 61000-4-6: 2013, IDT) IEC 61307:2011 Industrial microwave heating installations - Test methods for the determination of power output Note: GB/T 10066.6-2018 Test methods for electroheating and electromagnetic processing installations - Part 6: Test methods for the determination of power output of industrial microwave heating installations (IEC61307:2011, MOD) CISPR 16-1-2:2014+AMD1:2017 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 Note: 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) CISPR 16-1-4:2019+AMD1:2020+AMD2:2023 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 disturbance measurements Note: GB/T 6113.104-2021 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 disturbance measurements (CISPR 16-1-4:2019, IDT) CISPR 16-2-1:2014+AMD1:2017 Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-1: Methods of measurement of disturbances and immunity - Conducted disturbance measurements Note: GB/T 6113.201-2018 Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-1: Methods of measurement of disturbances and immunity - Conducted disturbance measurements (CISPR 16-2-1:2014, IDT) CISPR 16-2-3:2016+AMD1:2019+AMD2:2023 Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-3: Methods of measurement of disturbances and immunity - Radiated disturbance measurements Note: GB/T 6113.203-2020 Specification for radio disturbance and immunity measuring apparatus and methods - Part 2-3: Methods of measurement of disturbances and immunity - Radiated disturbance measurements (CISPR 16-2-3:2016, IDT) CISPR 32:2015+AMD1:2019 Electromagnetic compatibility of multimedia equipment - Emission requirements Note: GB/T 9254.1-2021 Information technology equipment, multimedia equipment and receivers - Electromagnetic compatibility - Part 1: Emission requirements (CISPR 32-2015, MOD) ITU Radio regulations (2020), Radio regulations (available at http://www.itu.int/en/myitu/Publications/2020/09/02/14/23/Radio-Regulations-2020)] 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purposes of this document, the terms and definitions given in GB/T 4365-2024 and the following apply. ISO and IEC maintain terminology databases for use in standardization at the following addresses: ——IEC Electropedia: available at http://www.electropedia.org/; ——ISO Online browsing platform: available at http://www.iso.org/obp. 3.1.1 AC mains power port port used to connect to a public low voltage AC mains power distribution network or other low voltage AC mains installation 3.1.2 associated equipment AE apparatus that is not part of the system under test, but needed to help exercise the EUT [Source: GB/T 6113.203-2020, 3.1.5] 3.1.3 arc welding equipment equipment for applying current and voltage and having the required characteristics suitable for arc welding and allied processes 3.1.4 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 Note 1: There are two basic types of this network, the V-network (V-AMN) which couples the unsymmetrical voltages, and the Delta-network (△-AMN), which couples the symmetric (DM) and the asymmetric (CM) voltages separately. Note 2: The terms line impedance stabilization network (LISN) and V-AMN are used interchangeably. [Source: GB/T 6113.102-2018, 3.1.6] 3.1.5 boundary of the equipment under test imaginary straight line periphery describing a simple geometric configuration encompassing the equipment under test Note: All interconnecting cables are included within this boundary. 3.1.6 component product which serves a specific function or functions and which is intended for use in a higher order assembled equipment or system 3.1.7 DC artificial network artificial DC network DC-AN artificial network that provides defined termination to the EUT’s DC power port under test while also providing the necessary decoupling from conducted disturbances originating from the laboratory DC power source or from the load 3.1.8 DC power port port used to connect to a low voltage DC power generating system or energy storage, or to another source/load Note: Such a system can be for example a photovoltaic or a fuel cell power generating system, or also a battery. 3.1.9 electro-discharge machining equipment EDM equipment all the necessary units for the spark erosion process including the machine tool, the generator, control circuits, the working fluid container and integral devices 3.1.10 electromagnetic radiation phenomenon by which energy in the form of electromagnetic waves emanates from a source into space Note: By extension, the term "electromagnetic radiation" sometimes also covers induction phenomena. [Source: GB/T 4365-2024, 3.1.10] 3.1.11 equipment for resistance welding and allied processes all equipment associated with carrying out the processes of resistance welding or allied processes Note: Such equipment consists of e.g. power source, electrodes, tooling and associated control equipment, which can be a separate unit or part of a complex machine. 3.1.12 equipment with radio functionality non-radio equipment (host equipment) including one or more radio devices or radio modules that can use host control function(s) and/or power supply Note 1: The use of the included radio equipment can be for remote control (of the host equipment by an external equipment or vice versa) or for data exchange with external equipment. Note 2: A radio device or radio module can be plugged-in, built-in or external. 3.1.13 fully-anechoic room FAR shielded enclosure, the internal surfaces of which are lined with radio-frequency-energy absorbing material (i.e. RF absorber) that absorbs electromagnetic energy in the frequency range of interest 3.1.14 fundamental frequency fundamental ISM frequency frequency on which the ISM equipment operates Note 1: Electromagnetic RF energy at the fundamental frequency (of an ISM equipment) can be used in, or transmitted by, or received by the equipment. This energy can be generated in the equipment but used outside the equipment (e.g. X-ray diagnostic equipment), or generated outside and used in the equipment or generated and used in the equipment (e.g. switching mode power supply, RF sterilizer, microwave oven). Note 2: Some ISM equipment categories do not have a fundamental ISM frequency. Examples: spectrum analyser, frequency counter. 3.1.15 grid connected power converter GCPC power converter connected to an AC mains power distribution network or other AC mains installation and used in a power generating system 3.1.16 high power electronic system and equipment one or more semiconductor power converters with a combined rated power greater than 75 kVA, or an equipment containing such converters Note: Examples of such high power electronic equipment are semiconductor power converters for application in UPS (Uninterruptible Power Systems) and PDS (Power Drive Systems). 3.1.17 highest internal frequency Fx highest fundamental frequency generated or used within the EUT or highest frequency at which it operates Note: This includes frequencies which are solely used within an integrated circuit. 3.1.18 industrial, scientific and medical applications ISM applications operation of equipment or appliances designed to generate and use locally radio frequency energy for industrial, scientific, medical, domestic or similar purposes, excluding applications in the field of telecommunications Note: Typical applications are the production of physical, biological, or chemical effects such as heating, ionisation of gases, mechanical vibrations, hair removal, acceleration of charged particles. A non-exhaustive list of examples is given in Annex A.0 [Source: ITU Radio Regulations Volume 1: 2020 - Clause I, Definition 1.15, modified] 3.1.19 ISM RF equipment and appliances equipment or appliances designed to generate and/or use locally radio-frequency energy for industrial, scientific, medical, domestic or similar purposes, excluding applications in the field of telecommunications and information technology and other applications covered by other CISPR publications Note: The abbreviation “ISM RF” is used throughout this document for such equipment or appliances only. 3.1.20 industrial robot automatically controlled, reprogrammable multipurpose manipulator, programmable in three or more axes, which can be either fixed in place or fixed to a mobile platform for use in automation applications in an industrial environment Note 1: The industrial robot includes: the manipulator, including robot actuators controlled by the robot controller; the robot controller; the means by which to teach and/or program the robot, including any communications interface (hardware and software). Note 2: Industrial robots include any auxiliary axes that are integrated into the kinematic solution. Note 3: Industrial robots include the manipulating portion(s) of mobile robots, where a mobile robot consists of a mobile platform with an integrated manipulator or robot. [Source: ISO 8373:2021, 3.6] 3.1.21 low voltage; LV a set of voltage levels used for the distribution of electricity and whose upper limit is generally accepted to be 1 000 V AC or 1 500 V DC [Source: GB/T 2900.50-2008, 601-01-26, modified]

Contents Foreword i 1 Scope 2 Normative references 3 Terms, definitions and abbreviations 3.1 Terms and definitions 3.2 Abbreviated terms 4 Frequencies designated for ISM use 5 Classification of equipment 5.1 Separation into groups 5.2 Division into classes 5.3 Documentation for the user 6 Limits of electromagnetic disturbances 6.1 General 6.2 Group 1 equipment measured on a test site 6.3 Group 2 equipment measured on a test site 6.4 Group 1 and group 2 class A equipment measured in situ 7 Measurement requirements 7.1 General 7.2 Ambient noise 7.3 Measuring equipment 7.4 Frequency measurement 7.5 Configuration of equipment under test 7.6 Load conditions of the EUT 7.7 Recording of test-site measurement results 8 Special provisions for test site measurements (9 kHz to 1 GHz) 8.1 Ground planes 8.2 Measurement of conducted disturbances 8.3 OATS and SAC for measurements in the range 9 kHz to 1 GHz 8.4 Alternative radiation test sites for the frequency range 30 MHz to 1 GHz 8.5 FAR for measurements in the range 30 MHz to 1 GHz 9 Radiation measurements: 1 GHz to 18 GHz 9.1 Test arrangement 9.2 Receiving antenna 9.3 Validation of the test site 9.4 Measurement procedure 10 Measurement in situ 11 Safety precautions for emission measurements on ISM RF equipment 12 Measurement uncertainty 13 Implementation of standard Annex A (Informative) Examples of equipment classification A.1 General A.2 Group 1 equipment A.3 Group 2 equipment Annex B (Normative) Measurement of electromagnetic radiation disturbance in the presence of signals from radio transmitters Annex C (Informative) Recommendations of CISPR for protection of certain radio services in particular areas C.1 General C.2 Recommendations for protection of safety-related radio services C.3 Recommendations for protection of specific sensitive radio services Annex D (Informative) Measurements on Grid Connected Power Converters (GCPC) – Setups for an effective test site configuration D.1 General information and purpose D.2 Setup of the test site D.3 Other test setups Annex E (Informative) Guidance on prevention of saturation effects in mitigation filters of transformer-less power converters during tests E.1 General information and purpose E.2 Recommendations for avoidance of saturation effects in the range 9 kHz to 150 kHz E.3 Detailed advice E.4 Background information Annex F (Normative) Additional requirements for equipment with radio functionality F.1 Configuration of the EUT during emission tests F.2 Radiated emissions F.3 Conducted emissions Bibliography