acoustic chamber is a chamber made of high-density metal and professional sound-absorbing materials, designed to reduce the impact of external noise on the equipment inside the chamber. It can also prevent the noise generated by the devices inside from spreading to the outside. Soundproof technology can be divided into two main parts: sound insulation and sound absorption. The calculation of soundproofing efficiency involves setting frequency points at one-third octave intervals within the working frequency range of the soundproof box, and testing and recording data with both open and closed doors, denoted as A and B respectively. The sound insulation level TL is calculated as B-A (dBA)."

Calibration Description

1.Reference documents and CNAS accredited scopes；

JJF 1147-2006 Specification for calibration of acoustic characteristics of anechoic and semi-anechoic chambers：Noise:(-2.5～120)dB;Sound Pressure Level:(-2.5~ 120)dB[31.5Hz～20kHz;d:(0.5～5)m]

2.A-Weighting External sound pressure level and internal sound pressure level

3.How to test the isolation of acoustic chamber|sound box|anechoic box|soundproof box