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GB/T 39640-2020: Measurement methods for electromagnetic fields of household appliances and similar apparatus with regard to human exposure
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Measurement methods for electromagnetic fields of household appliances and similar apparatus with regard to human exposure
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GB/T 39640-2020
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Basic data | Standard ID | GB/T 39640-2020 (GB/T39640-2020) | | Description (Translated English) | Measurement methods for electromagnetic fields of household appliances and similar apparatus with regard to human exposure | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | L06 | | Classification of International Standard | 97.030 | | Word Count Estimation | 38,317 | | Date of Issue | 2020-12-14 | | Date of Implementation | 2021-07-01 | | Regulation (derived from) | National Standard Announcement No. 28 of 2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39640-2020: Measurement methods for electromagnetic fields of household appliances and similar apparatus with regard to human exposure
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Measurement method of electromagnetic field exposure of household appliances and similar appliances to human body)
ICS 97:030
L06
National Standards of People's Republic of China
Electromagnetic fields of household appliances and similar appliances
Relative to the measurement method of human exposure
2020-12-14 release
2021-07-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Preface Ⅲ
Introduction Ⅳ
1 Scope 1
2 Normative references 1
3 Terms and definitions, symbols 2
4 Selection of measurement method and limit set 3
5 Measurement method 4
6 Evaluation of measurement results 8
Appendix A (Normative Appendix) Operating conditions for measuring magnetic induction intensity 12
Appendix B (Normative Appendix) Determination of Coupling Factor 18
Appendix C (informative appendix) Exposure limits 24
Appendix D (informative appendix) Examples of using Appendix C limits 26
Reference 33
Fig: 1 Flow chart of recommended test method selection starting with reference value evaluation 9
Figure 2 Example of a smooth curve of the correlation between the reference value and the frequency 10
Figure 3 Example of transfer function A corresponding to the reference value of Figure 2 10
Figure 4 Schematic diagram of the reference method 11
Figure A:1 Measuring position: above/front 15
Figure A:2 Measurement position: around 16
Figure A:3 Measuring distance between induction hob and induction hob 17
Figure B:1 High field strength area 18
Figure B:2 Gradient and integral of magnetic induction intensity G 19
Figure B:3 Equivalent coil position 19
Figure B:4 Gradient of magnetic induction intensity and coil 20
Figure B:5 Coupling factor aC(r) when the whole body conductivity σ=0:1S/m and Asensor=100cm2 (use ICNIRP limit
Readjust) 23
Figure D:1 Magnetic flux measurement 27
Figure D:2 The normalized field distribution at the tangential distance r0 28
Figure D:3 Numerical model of uniform human body 29
Figure D:4 Structural details of the head and shoulders 29
Figure D:5 The position of the magnetic field source Q relative to the model K 30
Table A:1 Measuring distance, sensor location and operating conditions 12
Table B:1 Values of G for different coils 20
Table B:2 For the whole body, the value of the coefficient k at 50 Hz 21
Table C:1 Basic limits for general public exposure to time-varying electric and magnetic fields with a frequency not exceeding 10 GHz 24
Table C:2 Reference values for general public exposure to time-varying electric and magnetic fields (effective values without interference) 24
Table C:3 Basic restrictions applicable to various parts of the human body when the general public is exposed to electromagnetic fields with a frequency not exceeding 3kHz 25
Table C:4 Magnetic field limits for general public exposure: head and torso exposure 25
Table D:1 Transfer function of ICNIRP public exposure 26
Table D:2 Transfer functions exposed by the IEEE public 26
Table D:3 Coupling factor ac(r1) 27
Foreword
This standard was drafted in accordance with the rules given in GB/T 1:1-2009:
This standard was proposed and managed by the National Radio Interference Standardization Technical Committee (SAC/TC79):
Drafting organizations of this standard: Weikai Testing Technology Co:, Ltd:, Guangdong Midea Life Electric Manufacturing Co:, Ltd:, Hefei Hualing Co:, Ltd:
Company, Philips (China) Investment Co:, Ltd:, Zhuhai Gree Electric Co:, Ltd:, Panasonic Home Appliance Research and Development (Hangzhou) Co:, Ltd:, Hisense
(Guangdong) Air Conditioning Co:, Ltd:, Shenzhen Angel Drinking Water Industry Group Co:, Ltd:, China National Electrical Equipment Research Institute Co:, Ltd:, Joyoung
Co:, Ltd:, Zhejiang Shaoxing Supor Life Electric Co:, Ltd:, Guangdong Xinbao Electric Co:, Ltd:, Hangzhou Boss Electric Co:, Ltd:
Company, Zhejiang Yueli Electric Co:, Ltd:, Xiaomi Communication Technology Co:, Ltd:, Amway (China) Commodity Co:, Ltd:, Guangdong Huanengda Electric
Co:, Ltd:, Shanghai Panasonic Microwave Oven Co:, Ltd:, Yunmi Internet Technology (Guangdong) Co:, Ltd:, China Household Electrical Appliances Research Institute, Zhongzheng Shangdong (Part 1)
Sea) Testing Technology Co:, Ltd:, Guangdong Yongheng Liangpin Technology Co:, Ltd:, Xiamen Forlan Home Appliance Technology Co:, Ltd:
The main drafters of this standard: Liu Guorong, Zeng Bo, Lu Weijie, Ji Tao, Chen Ziliang, Xiao Biao, Jia Chungeng, Lu Hongwei, Luo Binwen, Zhou Jijun,
Meng Chengcheng, An Xue, Yang Bin, Zhou Haixin, Lai Mingyu, Zhong Huixia, Chen Yinghuan, Ma Dengliang, Zheng Xiaohang, Qian Weijie, Huang Huaqun, Liu Meng, Chen Xiaoping,
Li Yan, Huan Yaping, Lu Junying, Peng Shichang, Lai Jinquan:
Introduction
This standard has developed a suitable evaluation method to determine the electromagnetic field in the space around the equipment mentioned in the scope and define the standard
Standard operating conditions and measuring distance:
This standard aims to measure and evaluate electromagnetic (EM) fields and their potential effects on the human body by referring to exposure standards: Existing Exposure Mark
Standards, such as ICNIRP'98[17]1), IEEEC95:1:1999[5] and IEEEC95:6:2002[6], propose rules for human exposure to electromagnetic fields:
The simplest and more practical level [limit value] that should be met is the electric field (E) and magnetic field measured when no one is exposed to these fields
(B) Upper limits (appropriately averaged in some cases), these limits are called IEEE-based levels or reference values (ICNIRP,
Ionizing Radiation Protection Committee) maximum allowable exposure level: Appropriate definitions and prescribed measurement techniques apply to any exposure compliance test
Quantity or evaluation: Compliance with the maximum allowable exposure or reference value is sufficient to meet the positive assessment of meeting these levels specified in the appropriate exposure standards:
This standard involves additional measurement and calculation techniques that allow compliance to be determined under a set of specific situations, without involving exposure time
Sometimes actual exposure conditions: This standard is not intended to replace the definitions and procedures specified in the exposure standards, but to
Supplementary procedures:
1) The numbers in brackets correspond to references:
Electromagnetic fields of household appliances and similar appliances
Relative to the measurement method of human exposure
1 Scope
This standard specifies the evaluation method of electric field intensity and magnetic induction intensity around household and similar appliances, including operating conditions and measurement:
Measuring distance and location, the electromagnetic field involved does not exceed 300GHz:
The appliance can be equipped with a motor, an electric heating element or both, and it can contain electrical or electronic circuits: It can be powered by mains, batteries or other
Power supply:
Appliances include household appliances, electric tools and electric toys:
Appliances that are not intended to be used in general households but are still accessible to the public or can be used by non-professionals belong to the scope of this standard:
This standard does not apply to:
---Appliances specially designed for heavy industry;
---The electrical installation parts (such as fuses, circuit breakers, cables and switches) intended to be fixedly installed on the building;
---Broadcast and television receivers, audio and video equipment and electronic musical instruments;
---Medical electrical equipment;
---Personal computers and similar equipment;
---Radio transmitter;
---Design appliances dedicated to vehicles:
For multi-function equipment involving different clauses of this standard and/or other standards at the same time, the relevant
The function is evaluated:
The abnormal operation of the appliance is not considered:
This standard includes the following specific elements for assessing human exposure:
---Provisions for sensors;
---Measurement method regulations;
--- Regulations on the operating mode of the equipment under test;
---Measurement distance and location regulations:
The applicable frequency range of the specific measurement method is 10Hz~400kHz: Unless otherwise specified in GB 4706 (all parts), this standard
Appliances within the range are deemed to comply with the frequency range above 400kHz and below 10Hz without testing:
2 Normative references
The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article
Pieces: For undated references, the latest version (including all amendments) applies to this document:
GB 4343:1 Electromagnetic compatibility requirements for household appliances, electric tools and similar appliances Part 1: Emission (GB 4343:1-2018,
CISPR14-1:2011, IDT)
GB 4706 (all parts) Safety of household and similar electrical appliances
GB 4706:2-2007 Safety of household and similar electrical appliances Part 2: Particular requirements for electric irons [IEC 60335-2-3:
2005(Ed5:1), IDT]
GB 4706:7-2014 Safety of household and similar electrical appliances: Special requirements for vacuum cleaners and water-suction cleaning appliances
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