The structure of the anechoic chamber is designed in accordance with international standard ISO 3745 Acoustics-Determination of sound power levels of noise sources-- precision methods for anechoic and semi-anechoic rooms and GB6882 Acoustics: Determination of sound power levels of noise sources: precision methods for anechoic and semi-anechoic rooms

At the same time meet the requirements of ISO 7779 equipment air noise test standard.

Acoustic Performance Index

1. The status quo of ambient noise in total anechoic chamber: the normal ambient noise around total anechoic chamber is about 60 db (ABC) .

2. Indoor background noise value: when the outdoor ambient noise is ≤60 db (ABC) , and there is no abnormal interference (such as hitting the ground, piling, impact) , the indoor background noise is ≤16 db (a)

3. Sound Insulation Index of total anechoic chamber: to ensure the background noise of total anechoic chamber ≤16 db (a) , the sound insulation index of wall, roof, door, exhaust air and other envelope structures of total anechoic chamber should be LP ≥44 db (a) , 4. Cut-off frequency: Fo ≤100 Hz

4. Dimensions of total anechoic chamber:

1. Total anechoic room background noise: when total anechoic room noise value: ≤60 db, total anechoic room background noise value: ≤16 db (a)

2. Test Sound Power: 10-channel

3. Full anechoic chamber size: external size: l × W × h = 5.18 × 5.68 × 5.18(m)(according to customer order) net size: l × W × h = 2.5 × 3.0 × 2.5(m)(according to customer order)