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GB/T 33615-2017 (GB/T33615-2017)

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GB/T 33615-2017: PDF in English (GBT 33615-2017)
GB/T 33615-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 61.020
Y 75
Garments – Testing Method of
Electromagnetic Shielding Effectiveness
ISSUED ON. MAY 12, 2017
IMPLEMENTED ON. DECEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
3. No action is required - Full-copy of this standard will be automatically &
immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 4
4 Principles ... 5
5 Test Conditions ... 5
6 Specimen ... 7
7 Test Procedures ... 7
8 Calculation and Result Expression ... 8
9 Test Report ... 9
Appendix A (Informative) Dielectric Property Parameters of Human Body
Model Filling Material ... 11
Bibliography ... 12
Foreword
This Standard was drafted as per the rules specified in GB/T 1.1-2009.
This Standard was proposed by China National Textile and Apparel Council.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Garments (SAC/TC 219).
Drafting organizations of this Standard. Hangzhou Municipal Quality and Technology
Supervision and Testing Institute, Shanghai Institute of Measurement and Testing
Technology, Shanghai Garment Research Institute, Shanghai Anti-Electromagnetic
Radiation Association, Shanghai Pregnant Industrial Co., Ltd., Shanghai Libeici
Textiles Science and Technology Co., Ltd., Shanghai Lion High-Tech Co., Ltd.,
Qingdao X-silver Textile Technology Co., Ltd., and Anfanggaoke Electromagnetic
Security Technology (Beijing) Co., Ltd.
Chief drafting staffs of this Standard. Gu Hongfeng, Cai Qing, Xu Jian, Li Guodong,
Zhao Pu, Xia Haiping, Liu Manhua, Bo Qingge, Zhu Andong, Gu Hu, Zhou Shuangxi,
and Yang Xiuyue.
Garments – Testing Method of
Electromagnetic Shielding Effectiveness
Warning – Personnel using this Standard shall have the practical experience in
the formal laboratory. During the test period as per this Standard, the relevant
personnel shall be protected against the harm from electromagnetic radiation.
1 Scope
This Standard specifies the test method for electromagnetic shielding effectiveness of
civil (non-professional use) anti-electromagnetic radiation garments.
This Standard is applicable to the anti-electromagnetic radiation garments worn by
people in daily life and made of electromagnetic shielding fabric; the frequency range
is of 80MHz ~ 6000MHz.
2 Normative References
The following documents are essential to the application of 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) are applicable to this document.
GB/T 8629-2001 Textiles – Domestic Washing and Drying Procedures for Textile
Testing
3 Terms and Definitions
The following terms and definitions are applicable to this document.
3.1 Electromagnetic shielding effectiveness
On certain point with the same excitement, the electric field strength ratio detected
from the unshielded and shielded garments, which shall be expressed in logarithmic.
3.2 Anechoic chamber
Shielding room installed the wave-absorbing materials to reduce the radio wave
reflection from the internal surface.
[GB/T 17626.3-2006, definition 4.2]
3 – Human body model;
4 – Wave-absorbing materials.
Figure 1 -- Test Schematic Diagram
7.1.4 Test points. the receiving probes are placed in the front center of human body
model chest and abdomen, and placed in the internal part of the human body model.
The external surface of the probe shall be flush with the human body model. See
Figure 1.
NOTE. since the usage and style of sample are different, the test parameters can also be
determined through the negotiation between relevant parties. However, it shall be indicated in
the test report.
7.2 Test procedures
7.2.1 After calibrating the test system, set the output signal frequency (see 7.1.1) and
level of signal generator, so that the electric field strength (E2) of the shielded garment
is greater than 3dB of sensitivity of receiving probe. Maintain the signal amplifier output
level unchanged; each position (test point) of the sample shall be tested once from the
horizontal and vertical polarization; perform the test against the two test points (see
7.1.4) of human body model; then obtain 24 electronic field strength test data of E1.
7.2.2 Put the tested garment sample onto the human body model, pay attention that
the access location of the wire shall not influence the normal wearing state of the
garment; after maintaining the relative positions between the garment and the human
body model, perform the test as per 7.2.1; then obtain 24 electronic field strength test
data of E2.
NOTE. for the garment with adjustable zipper or clothes rope, when wearing the garment, the
zipper shall be closed, and the clothes rope shall be tied.
7.2.3 For the anti-washing and anti-electromagnetic radiation garment, after washing
and drying the specimen as per 6.2, then perform the test as per 7.2.2.
8 Calculation and Result Expression
8.1 Record the actual value (see Table 1) of electric field strength on the chest and
abdomen test points; calculate the electromagnetic shielding efficiency as per Formula
(1); round-off to one digit after the decimal.
Where.
Bibliography
[1] GB/T 1335 (all parts) Standard Size Systems for Garments
[2] GB 5296.4 Instructions for Use of Products of Consumer Interest – Part 4. Textiles
and Apparel
[3] GB/T 17626.3-2006 Electromagnetic Compatibility - Testing and Measurement
Techniques - Radiated Radio-Frequency Electromagnetic Field Immunity Test
[4] GB/T 23463-2009 Protective Clothing – Protective Clothing against Microwave
Radiation
[5] YD/T 1644.2-2007 Human Exposure to Radio Frequency Fields from Hand-Held
and Body-Mounted Wireless Communication Devices - Human Model
Instrumentation and Procedures – Part 2. Specific Absorption Rate (SAR)
Assessment Procedures for Wireless Communication Equipment close to the Body
(Frequency range 30MHz ~ 6GHz)
[6] DIN 32780-100-2002 Protective Clothing – Part 100. Protection against
Electromagnetic Fields in the Frequency Range from 80MHz to 1GHz –
Requirements and Test Methods
......
 
(Above excerpt was released on 2017-09-15, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT33615-2017