GB/T 33615-2017 in English

1. Background and purpose of the standard

GB/T 33615-2017 "Test Method for Electromagnetic Shielding Effectiveness of Clothing" is the first national standard for civilian anti-electromagnetic radiation clothing, which aims to provide a scientific and unified test method for the electromagnetic shielding effectiveness of clothing.

With the popularization of electronic devices, the problem of electromagnetic radiation is becoming more and more serious, especially in urban environments, and people's demand for wearing anti-electromagnetic radiation clothing is increasing. The formulation of this standard fills the gap in this field at home and abroad, ensuring the consistency of product quality and test results.

2. Comparative Analysis of Standard Frameworks

3. Interpretation of the core content of the standard

3.1 Test site and environmental conditions

Test site requirements:The test is carried out in a semi-anechoic chamber, and absorbing materials are laid to reduce floor reflection. The electromagnetic shielding effectiveness of the darkroom should be greater than 60 dB.

Environmental conditions:The temperature is controlled at (23±5)℃, the relative humidity is 40%~80%, and there is no significant air flow and electromagnetic interference in the test area.

3.2 Test system requirements

Signal generator:Frequency range covers 80 MHz ~ 6 GHz, output level range -50 dBm ~ 0 dBm, VSWR ≤1.5.

Field strength measurement device:Frequency range is the same as above, measurement range is 0.5 V/m ~ 800 V/m, probe isotropic error is ±0.5 dB.

3.3 Test procedure

Test steps:Includes system calibration, unshielded state measurement (E₁), shielded state measurement (E₂), and SE value calculation.

Key formula:SE = 20 log(E₁/E₂), the result is rounded to one decimal place. If SE is negative, only E₁ and E₂ values are recorded.

4. Implementation Suggestions