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GB 4824-2025: Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB 4824: Historical versions
GB 4824-2025: Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement---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/GB4824-2025 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 33.100 CCS L 06 GB 4824-2025 / CISPR 11.2024 Replacing GB 4824-2019 Industrial, Scientific and Medical Equipment – Radio- Frequency Disturbance Characteristics – Limits and Methods of Measurement (CISPR 11.2024, IDT) Issued on: FEBRUARY 28, 2025 Implemented on: MARCH 1, 2026 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 4 1 Scope... 7 2 Normative References... 8 3 Terms, Definitions and Abbreviated Terms... 9 3.1 Terms and definitions... 9 3.2 Abbreviated terms... 16 4 Frequencies Designated for ISM Use... 17 5 Classification of Equipment... 18 5.1 Separation into groups... 18 5.2 Division into classes... 18 5.3 Documentation for the user... 19 6 Limits of Electromagnetic Disturbances... 19 6.1 General... 19 6.2 Group 1 equipment measured on a test site... 20 6.3 Group 2 equipment measured on a test site... 28 6.4 Group 1 and group 2 class A equipment measured in situ... 35 7 Measurement Requirements... 38 7.1 General... 38 7.2 Ambient noise... 38 7.3 Measuring equipment... 39 7.4 Frequency measurement... 42 7.5 Configuration of equipment under test (EUT)... 43 7.6 Load conditions of the EUT... 53 7.7 Recording of test-site measurement results... 58 8 Special Provisions for Test Site Measurements 9 kHz to 1 GHz... 59 8.1 Ground planes... 59 8.2 Measurement of conducted disturbances... 59 8.3 OATS and SAC for measurements in the range 9 kHz to 1 GHz... 65 8.4 Alternative radiation test sites for the frequency range 30 MHz to 1 GHz... 67 8.5 FAR for measurements in the range 30 MHz to 1 GHz... 68 9 Radiation Measurements 1 GHz to 18 GHz... 68 9.1 Test arrangement... 68 9.2 Receiving antenna... 68 9.3 Validation of test site... 68 9.4 Measuring procedure... 68 10 Measurement in Situ... 72 11 Safety Precautions for Emission Measurements on ISM RF Equipment... 73 12 Measurement Uncertainty... 73 13 Implementation of Standard... 73 Annex A (Informative) Examples of Equipment Classification... 74 A.1 General... 74 A.2 Group 1 equipment... 74 A.3 Group 2 equipment... 75 Annex B (Normative) Measurement of Electromagnetic Radiation Disturbance in the Presence of Signals from Radio Transmitters... 77 Annex C (Informative) Recommendations of CISPR for Protection of Certain Radio Services in Particular Areas... 78 C.1 General... 78 C.2 Recommendations for protection of safety-related radio services... 78 C.3 Recommendations for protection of specific sensitive radio services... 80 Annex D (Informative) Measurements on Grid Connected Power Converters (GCPC) – Setups for an Effective Test Site Configuration... 83 D.1 General information and purpose... 83 D.2 Setup of the test site... 83 D.3 Other test setups... 85 Annex E (Informative) Guidance on Prevention of Saturation Effects in Mitigation Filters of Transformer-Less Power Converters during Tests... 88 E.1 General information and purpose... 88 E.2 Recommendations for avoidance of saturation effects in the range 9 kHz to 150 kHz ... 89 E.3 Detailed advice... 90 E.4 Background information... 92 Annex F (Normative) Additional Requirements for Equipment with Radio Functionality... 96 F.1 Configuration of the EUT during emission tests... 96 F.2 Radiated emissions... 96 F.3 Conducted emissions... 96 Bibliography... 98ForewordThis Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents. This Document replaced GB 4824-2019 Industrial, Scientific and Medical Equipment - Radio- Frequency Disturbance Characteristics - Limits and Methods of Measurement. Compared with GB 4824-2019, the major technical changes of this Document are as follows besides the structural adjustments and editorial modifications. --- Change the Scope of the standard (see Clause 1 of this Edition; Clause 1 of the 2019 Edition); --- Add 13 Terms and Definitions, including “associated equipment”, “equipment with radio functionality”, “fundamental frequency”, “highest internal frequency”, “industrial robot”, “medical robot”, “power conversion equipment”, “radio device”, “radio module”, “radio transmitter”, “rated load”, “robot”, and “wired network port”; and add 29 abbreviated terms (see Clause 3 of this Edition); --- The main changes in “6.2 Group 1 equipment measured on a test site” are summarized as follows. ● Change the type of equipment applicable to the specified limits of low-voltage DC power ports (see 6.2.1.1 of this Edition; 6.2.1.1 of the 2019 edition); ● Add the Table of “Applicability of measurements at DC power port” (see Table 6 of this Edition); ● Add the Table of “Limits for conducted disturbance measured on a test site (wired network port)” (see Table 7 of this Edition); ● Add the requirements for radiated disturbance measurements in the 1GHz~18GHz frequency band (see 6.2.2.4 of this Edition); ● Add the Table of "Required highest frequency for radiated measurement" (see Table 10 of this Edition); ● Add the limit above 1GHz for Group 1 equipment “Electromagnetic radiation disturbance limits for Group 1 equipment measured on a test site” (see Table 11 of this Edition); --- Add “Measurement of robots” (see 7.5.4 of this Edition); --- Add the Figure of “EUT boundary determination for radiated disturbance measurements of robots with extended/moving arm” (see Figure 5 of this Edition); --- Add the Figure of “Example of a typical test setup for conducted disturbance measurement of a floor-standing robot system” (see Figure 6 of this Edition); --- Add the Figure of “Example of a typical test setup for radiated disturbance measurement of a floor-standing robot system” (see Figure 7 of this Edition); --- Add the Figure of “Example of a typical test setup for conducted disturbance measurement on a combination robot system” (see Figure 8 of this Edition); --- Added the figure of “Typical test arrangement for conducted disturbance measurement of combined robot system” (see Figure 9 of this Edition); --- Add the requirements for “robot” in “7.6 Load conditions of EUT” (see 7.6.11 of this Edition); --- Add the Table of “Operation modes for fixed robots” (see Table 22 of this Edition); --- Add the Table of “Operation modes for mobile robots” (see Table 23 of this Edition); --- The main changes in “9.4 Measuring procedure” are summarized as follows. ● Changed the “Decision tree for the measurement of emissions from 1GHz to 18GHz for Group 2 equipment operating at frequencies above 400 MHz” (see Figure 17 of this Edition; Figure 12 of the 2019 Edition); ● Change the original pre-measurement and peak measurement into peak measurement (see 9.4.3 of this Edition; 9.4.3 and 9.4.4 of the 2019 Edition); ● Change the content of the table of “Frequency subranges to be used for weighted measurements” (see Table 24 of this Edition; Table 18 of the 2019 edition); ● Change APD weighting measurement into be performed at 5 frequencies (see 9.4.4.3 of this Edition; 9.4.4.2.3 of the 2019 Edition); --- Delete the normative appendix “Artificial network (AN) for evaluating disturbance voltage at the DC power port of semiconductor power converters” (see Appendix I of the 2019 Edition); --- Add the normative appendix “Additional requirements for equipment with radio functionality” (see Appendix F of this Edition). This Document equivalently adopted CISPR 11.2024 Industrial, Scientific and Medical Equipment – Radio-Frequency Disturbance Characteristics – Limits and Methods of Measurement. --- Referring to the provisions of the Radio Frequency Division Regulations of the People's Republic of China (No. 62 Order of the Ministry of Industry and Information Technology), change the corresponding frequency bands in Table 1 and in Annex C. the sensitive radio service frequency band allocation to make them more in line with China's national conditions; --- In order to better understand the standard, the final basis of Footnote b in Tables 18 and 19 is described as. If the sub-band where the highest interference level is located is outside the satellite downlink range, two final measurements shall be made around the highest emission frequency and in the highest emission frequency band within the satellite downlink range; --- Add Clause 13 "Implementation of the Standard"; --- Change the Footnote a of the Article A.3.2 [Translator Note. Here it shall be Article A.3.1] into Footnote 1) under page in accordance with GB/T 1.1-2020. Please note some contents of this Document may involve patents. The issuing agency of t his Document shall not assume the responsibility to identify these patents. This Document was proposed by and under the jurisdiction of Standardization Administration of the People’s Republic of China. The historical editions replaced by this Document are as follows. --- GB 4824-1984 was first-time published in 1984; first-time revised in 1996; second-time revised in 2001; third-time revised in 2004; fourth-time revised in 2013; and fifth-time revised in 2019.1 ScopeThis 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.2 Normative ReferencesThe provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 4365-2024 Electrotechnical terminology - Electromagnetic compatibility (IEC 60050-161.2021, MOD) NOTE. There are no technical differences between the quoted contents of GB/T 4365-2024 and that of the 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 (CISPR 16-4-2.2018, IDT)3 Terms, Definitions and Abbreviated Terms3.1 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. 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]4 Frequencies Designated for ISM UseCertain frequencies are designated by the International Telecommunication Union (ITU) for use as fundamental frequencies for ISM RF applications (see also Definition 3.1.18). These frequencies are listed in Table 1.5 Classification of Equipment5.1 Separation into groups In order to simplify identification of the relevant limits, the equipment in the scope of this document is categorized into two groups, i.e. into group 1 and group 2. 5.2 Division into classes In accordance with the intended use of equipment in the electromagnetic environment, this document defines two classes of equipment, namely class A and class B.6 Limits of Electromagnetic Disturbances6.1 General For measurements at standardized test sites, the requirements specified hereafter constitute the requirements for tests. Class A equipment may be measured either on a test site or in situ as preferred by the manufacturer.7 Measurement Requirements7.1 General The requirements specified in this Clause, together with the limits specified in Clause 6, constitute the essential EMC requirements of this document. Specific requirements for making measurements on a test site are given in Clause 8 and Clause 9, for making measurements in situ in Clause 10. The requirements of the present clause are to be met for both test site and in situ measurements. Measurements shall only be performed in frequency ranges where limits are specified in Clause 6. 7.2 Ambient noise A test site shall allow emissions from the equipment under test (EUT) to be distinguished from ambient noise. The suitability in this respect can be determined by measuring the ambient noise levels with the equipment under test (EUT) inoperative and ensuring that the ambient noise levels are at least 6 dB below the limits specified in 6.2 or 6.3, as appropriate for the measurement being carried out.8 Special Provisions for Test Site Measurements (9 kHz to 1 GHz)8.1 Ground planes For the measurement of radiated disturbances at an open-area test site (OATS) and in a semi- anechoic chamber (SAC) and for the measurement of conducted disturbances on any test site, a ground plane shall be used. The requirements for the radiation test site are given in 8.3 and, for the ground plane for the measurement of conducted disturbances, in 8.2. 8.2 Measurement of conducted disturbances 8.2.1 General For the EUT's earthing and grounding conditions as well as connection to the laboratory's electricity supply network, see 7.5.3. The measurement of conducted disturbances shall be carried out using one of the following methods. 9 Radiation Measurements (1 GHz to 18 GHz) 9.1 Test arrangement The equipment under test (EUT) shall be placed on a turntable at a suitable height. Power at the normal voltage shall be supplied. For the EUT's earthing and grounding conditions as well as connection to the laboratory's electricity supply network, see 7.5.3. 9.2 Receiving antenna The measurements shall be made with a directive antenna of small aperture capable of making separate measurements of the vertical and horizontal components of the radiated field. The height above the ground of the center line of the antenna shall be the same as the height of the approximate radiation center of the equipment under test (EUT). The distance between the receiving antenna and the EUT shall be 3 m. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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