GB/T 39640-2020 English PDF

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GB/T 39640-2020: Measurement methods for electromagnetic fields of household appliances and similar apparatus with regard to human exposure
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 39640-2020	709	Add to Cart	6 days	Measurement methods for electromagnetic fields of household appliances and similar apparatus with regard to human exposure	Valid

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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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