743 EMC Anechoic Chamber

I. Applications

1. This EMC test site - 743 anechoic chamber - is a newly designed EMC test site primarily used for standard testing of radiated emissions and radiation susceptibility. The entire system has multiple applications.

2. This site can test telecommunications equipment, household appliances, automotive components, industrial, medical, and electronic equipment (ISM), and information technology equipment (ITE) within a specified testing distance.

3. This anechoic chamber fully complies with general standards, and its frequency range can be extended to 18 GHz.

4. A state-of-the-art modular system is used for shielding and absorbing materials. The installed anechoic chamber can be dismantled, reinstalled, or expanded to adapt to new standards.

II. Normalized Site Attenuation (NSA)

After the anechoic chamber is constructed, for standard testing within the 30 MHz to 1 GHz frequency range, a comparative method is used. The frequency range difference with the designated laboratory under the same conditions (empty field and equipment) is less than 3 dB.

III. Background Noise

With all equipment (including lighting, CCTV, turntable, antenna tower, etc.) in the anechoic chamber and control room operating within the 30MHz-18GHz frequency range, the measured spatial background noise level in the anechoic chamber is less than the CISPR 22B limit, less than 10dB.

IV. Grounding Resistance

The grounding resistance of the anechoic chamber and control room must be less than 2 ohms, and the insulation resistance greater than 2 megohms.

V. Technical Specifications

1. Anechoic Chamber Dimensions: Approximately 7.0*4.0*3.0 meters (Length x Width x Height).

2. Control Room Dimensions: 3.0*3.0*3.0 meters (Control room dimensions can be adjusted according to site requirements).

3. Shielding Performance: 9kHz ≥ 70dB; 150kHz ≥ 90dB; 200kHz-50MHz ≥ 100dB; 50MHz-1GHz ≥ 100dB; 1GHz-18GHz ≥ 95dB