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Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
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Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
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Industrial, scientific and medical (ISM) radio-frequency equipment -- Disturbance characteristics -- Limits and methods of measurement
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Industrial, scientific and medical (ISM) radio-frequency equipment -- Electromagnetic disturbance characteristics -- Limits and methods of measurement
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Industrial, scientific and medical (ISM) radio-frequency equipment -- Electromagnetic disturbance characteristics -- Limits and methods of measurement
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Limits and methods of measurement of electromagnetic disturbance characteristics of industrial, scientific and medical (ISM) radio frequency equipment
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Limits of radio interference of industrial, scientific and medical (ISM) radio frequency equipment
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Similar standards GB 4343.1 GB/T 4365 GB 4824-2025: Industrial, scientific and medical equipment - Radio-frequency disturbance characteristics - Limits and methods of measurement
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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 Contents
Foreword... 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... 98
Foreword
This 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 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.
2 Normative References
The 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 Terms
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.
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 Use
Certain 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 Equipment
5.1 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 Disturbances
6.1 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 Requirements
7.1 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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