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GB/T 30142-2013: Measuring methods for shielding effectiveness of planar electromagnetic shielding materials
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Measuring methods for shielding effectiveness of planar electromagnetic shielding materials
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GB/T 30142-2013
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Basic data | Standard ID | GB/T 30142-2013 (GB/T30142-2013) | | Description (Translated English) | Measuring methods for shielding effectiveness of planar electromagnetic shielding materials | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | F74 | | Classification of International Standard | 17.240 | | Word Count Estimation | 26,251 | | Quoted Standard | GB/T 25471-2010; GB/T 26667-2011 | | Regulation (derived from) | National Standards Bulletin No. 25 of 2013 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | | Summary | This standard specifies the methods of measurement of electromagnetic shielding effectiveness within the frequency range of 10kHz ~ 40GHz planar electromagnetic shielding materials. This standard applies to the electromagnetic shielding fabric, electromag | GB/T 30142-2013: Measuring methods for shielding effectiveness of planar electromagnetic shielding materials
---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 methods for shielding effectiveness of planar electromagnetic shielding materials
ICS 17.240
F74
National Standards of People's Republic of China
Planar electromagnetic shielding material shielding effectiveness measurement method
Issued on. 2013-12-17
2014-05-10 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Table of Contents
Preface Ⅰ
1 Scope 1
2 Normative references 1
3 Terms and definitions
3.1 Thin Electric 1
3.2 shielding effectiveness 1
4 Measurement 2
4.1 General 2
4.2 flange means coaxially Act 2
4.3 Method 6 shielded room
5 reporting requirements 9
Appendix A (Informative Appendix) 30MHz ~ 1.5GHz coaxial flange configuration diagram of apparatus 10
Appendix B (Informative Appendix) 30MHz ~ 3GHz coaxial flange means 15
Annex C (normative) calculation of the resonant frequency of the shielded room 20
Annex D (informative) shielding effectiveness data recording table 21
References 22
Foreword
This standard was drafted in accordance with GB/T 1.1-2009 given rules.
The standard proposed by China Electrical Equipment Industrial Association.
This standard by the National Technical Committee of Standardization of electromagnetic shielding material (SAC/TC323) centralized.
This standard was drafted. Shanghai Measurement and Testing Technology Research Institute, China Institute of Metrology, Southeast University, Shanghai morning-long New Textile Material
Expected Ltd., electromagnetic Anfang Gaoke Security Technology (Beijing) Co., Ltd., Tianjin Polytechnic University, Shandong days Connaught Photoelectric Material Co., Ltd.
Drafters of this standard. Sang Yu, Chen Chaochan, Huang Pan, Cai Qing, Jiang Quanxing, Lu Fumin to Lei, Huang Jianhua, Zhu Andong, Qilu, Zhu Yan Yan.
Planar electromagnetic shielding material shielding effectiveness measurement method
1 Scope
This standard specifies the method for measuring the electromagnetic shielding effectiveness within the frequency range of 10kHz ~ 40GHz planar electromagnetic shielding material.
This standard applies to electromagnetic shielding fabric, electromagnetic shielding metal plate, metal mesh electromagnetic shielding, electromagnetic shielding glass, electromagnetic shielding film, electrical
Magnetic electromagnetic shielding plastic, rubber and other planar electromagnetic shielding electromagnetic shielding material shielding effectiveness measurement.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version suitable for use herein
Member. For undated references, the latest edition (including any amendments) applies to this document.
GB/T 25471-2010 electromagnetic shielding paint shielding effectiveness measurement method
GB/T 26667-2011 electromagnetic shielding material terms
3 Terms and Definitions
GB/T 26667-2011 define the following terms and definitions apply to this document.
3.1 Electric thin electricalythin
Far less than the thickness of the sample (< 1/100) wavelength conductive sample.
NOTE. rewrite GB/T 25471-2010, definitions 3.2.
3.2 shielding effectiveness electromagneticshielding; SE
At some point the same excitation, shielding materials and shielding materials without the measured electric field strength, magnetic field strength or power ratio.
SE = 20lg (E2/E1) (dB)
Or SE = 20lg (H2/H1) (dB) (1)
Or SE = 10lg (P2/P1) (dB)
Where.
SE --- shielding effectiveness (dB);
H1 --- unshielded magnetic field strength of the material;
H2 --- a magnetic field strength of the shielding material;
E1 --- unshielded electric field strength of the material;
E2 --- electric field strength when the shielding material;
P1 --- power when no shielding material;
P2 --- power of shielding material.
Note. The shielding effectiveness is usually negative, but the practice of using its absolute value.
[GB/T 26667-2011, the definition 2.1.7]
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