ASTM E596-96 test method determines the noise reduction of sound isolating enclosures. It provides details about the noise isolation class by measuring the noise reduction. The enclosure is placed in a reverberation room to ensure safe and proper testing. The final results of this method are displayed keeping in view the international standards.
Scope:
ASTM E596-96 test method covers the measurement of noise reduction of sound isolating enclosures when placed in a reverberation room. This gives details about the sound-isolating enclosures and helps in ranking them with respect to noise isolation class. The results obtained from this method help in quality control, research, and performance evaluation of various sound-isolating enclosures.
Procedure:
The sound-isolating enclosure is prepared and placed in a reverberation room. The noise levels are adjusted and measured with respect to one-third octave bands. The one-third octave band sound pressure is measured on the onset of bands of random noise. The noise reduction data is taken and stands for the difference between the space-averaged sound pressure level in the reverberation room and that in the enclosure. The noise isolation data then helps in the determination of the noise isolation class.
Specimen Size:
Specimen size should be as per the requirements. In this case, a one-third octave filter set is used with its frequency varying from 125 to 4000 Hz. The signal level should be at least 10 dB above the background noise level.
Data:
The signal level is corrected by applying the formula if the background noise level is between 5 and 10dB, where ‘L’ stands for the signal level, and ‘NR’ stands for the noise reduction.
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