Evaluation of reverberation chamber relation to reverberation time and distribusion of sound pressure level with ISO 354 as standart in building physics laboratory of physics departement ITS

Many of the building materials on the market in Indonesia are not included with material properties data. In acoustic books, quite a lot of acoustic data are listed, but these data do not match the material marketed in Indonesia. Bricks that are marketed in European countries or neighboring countries, have different nature with brick in Indonesia. so that materials from abroad do not reflect the acoustic properties of building materials in Indonesia. One important data is the value of material absorption coefficient. Calculating The value of the absorption coefficient is performed in a standardized Reverberation Chamber. In this study conducted an evaluation of Reverberation Chamber in Physics Laboratory Building Department of Physics FIA ITS. The method used in the study refers to ISO 354. From the measurement results have been obtained cut-off frequency of 20 Hz while the critical frequency is 150 Hz. The measured RT value is quite high and above the minimum RT value of ISO 354 in all frequency ranges as shown in figure.1. as shown in figure.1, at a frequency of 500 Hz, Reverberation Time reaches 7.35 s. Evaluation of this Reverebration Chamber is important to know if it can be done as a test chamber.