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GB/T 39278-2020: Method for measuring the shielding effectiveness of shielding enclosures having all dimensions between 0.1 m and 2 m
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Method for measuring the shielding effectiveness of shielding enclosures having all dimensions between 0.1 m and 2 m
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GB/T 39278-2020
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Basic data | Standard ID | GB/T 39278-2020 (GB/T39278-2020) | | Description (Translated English) | Method for measuring the shielding effectiveness of shielding enclosures having all dimensions between 0.1 m and 2 m | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | L06 | | Classification of International Standard | 33.100.10 | | Word Count Estimation | 62,642 | | Date of Issue | 2020-11-19 | | Date of Implementation | 2021-06-01 | | Regulation (derived from) | National Standard Announcement No. 26 of 2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39278-2020: Method for measuring the shielding effectiveness of shielding enclosures having all dimensions between 0.1 m and 2 m
---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.
(Measuring method of shielding effectiveness of 0:1m～2m shielding shell)
ICS 33:100:10
L06
National Standards of People's Republic of China
Measuring method of shielding effectiveness of 0:1m~2m shielding shell
2020-11-19 released
2021-06-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Preface Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Preparation before measurement 2
4:1 Background 2
4:2 Test Plan 2
4:3 Equipment calibration 2
4:4 Reference level 2
4:5 Dynamic range 2
4:6 Personnel in the shielded enclosure 3
4:7 Initial test of shielding effectiveness 3
4:8 Determination of measurement results 3
5 Measurement method selection 3
6 Measurement method of shielding effectiveness of 0:75m~2m shielding shell 4
6:1 Recommended measurement frequency 4
6:2 Calculation of measurement results 4
6:3 Preparation for measurement 5
6:4 9kHz~30MHz frequency band measurement 5
6:5 Measurement in frequency band above 30MHz 9
7 Measuring method of shielding effectiveness of small physical size (< 0:75m) and electrically large shielding shell 14
7:1 Overview 14
7:2 Measuring equipment 15
7:3 Confirmation of mixing chamber 15
7:4 Measuring frequency 15
7:5 Measuring principle of frequency stirring 15
7:6 Selection criteria for frequency stirring bandwidth 15
7:7 The receiving antenna in the tested shielded shell 16
7:8 Antennas in the external mixing chamber 16
7:9 Measuring arrangement 16
7:10 Calculation of shielding effectiveness 17
7:11 Calculation of the average value 18
7:12 Calibration of coaxial cable 19
8 Measurement uncertainty 19
9 Test report 19
Appendix A (informative appendix) Initial test and improvement 21
Appendix B (informative appendix) Use the magnetic field measurement method (≤300MHz) to measure the shielding effectiveness of small and electrically small shielded enclosures
Appendix C (informative appendix) Electrically small-sized shielded enclosure in mixing chamber 29
Appendix D (informative appendix) Application of absorbing materials in the measurement of shielding effectiveness of equipment shielding shells 32
Appendix E (Normative Appendix) Internal Radiation Law 36
Appendix F (informative appendix) Other relevant information 40
Appendix G (Normative Appendix) Shielding Effectiveness Calculation Formula of 0:75m~2m Shielding Shell 42
Appendix H (Informative Appendix) Shielding Effectiveness Measurement Basis of 0:75m~2m Shielding Shell 44
Appendix I (informative appendix) Working principle of monopole antenna mounted on the wall 48
Appendix J (Normative Appendix) Impedance Mismatch Correction 53
Appendix K (informative appendix) Isolated monopole antennas used in external mixing chambers 56
Foreword
This standard was drafted in accordance with the rules given in GB/T 1:1-2009:
Please note that certain contents of this document may involve patents: The issuing agency of this document is not responsible for identifying these patents:
This standard was proposed and managed by the National Radio Interference Standardization Technical Committee (SAC/TC79):
Drafting organizations of this standard: China Electronics Standardization Institute, Southeast University, Beijing Daze Technology Co:, Ltd:, Anfang Hi-Tech Electromagnetic Safety
All Technology (Beijing) Co:, Ltd:, Beijing Institute of Radio Measurement and Testing, and Shanghai Electrical Apparatus Research Institute:
The main drafters of this standard: Zhao Lei, Zhou Zhongyuan, Zhou Xiang, Sha Changtao, Li Lijia, Lu Zhiheng, Shen Tao, Ye Chang, Zhang Fengxian:
Measuring method of shielding effectiveness of 0:1m~2m shielding shell
1 Scope
This standard specifies the measurement method for the shielding effectiveness of 0:1m~2m shielded enclosures:
This standard is applicable to the measurement of shielding effectiveness of 0:1m~2m shielded enclosures:
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/T 4365 Electrotechnical terms electromagnetic compatibility
GB 8702 Electromagnetic environment control limit
GB/T 12190 Measurement method of shielding effectiveness of electromagnetic shielding room
GB/T 17626:21 Electromagnetic compatibility test and measurement technology mixing chamber test method
3 Terms and definitions
The following terms and definitions defined in GB/T 4365 and GB/T 12190 apply to this document:
3:1
Electricalylarge
The shielding shell supports no less than 60 modes at the frequency point of interest:
3:2
Electricalysmal
The maximum side length of the shielding shell is less than one-tenth of the wavelength corresponding to the frequency point of interest:
3:3
Frequencystirring
The method of changing the composition of the field mode in the cavity by changing the frequency:
3:4
Mode
A solution of Maxwell's equations corresponding to a field distribution in a given space:
3:5
Mechanicalstirring
The position change of the mechanical device (stirrer) made of low-loss conductive material changes the boundary conditions of the cavity, thereby changing the cavity
The method of field mode composition:
3:6
Modestirring
The method of changing the field mode composition in the cavity by changing the frequency, boundary conditions, or the location of the source:
3:7
Parent structure
A fixing device or structure used to install the shielded shell under test:
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