Title: +038=243.001-AG002T_02-Deko Silent glass 44 dB Bygginnredning - DOP.pdf
Low frequenciesThe dimensions of the receiving room were smaller than rec- ommended for testing in the frequency range from 50 Hz to 80 Hz as per EN ISO 10140-4:2010 Annex A (informative). A mov- ing loudspeaker was used.Background noise levelThe background noise level in the receiving room was deter- mined during measurement and the receiving room level L2 cor- rected by calculation as per EN 10140-4: 2010 Clause 4.3.Maximum sound insulation The Maximum sound insulation of the test rig is at least 15 dB higher than the measured sound reduction index of the test specimen. Not corrected by calculation.Measurement of reverberation timearithmetical mean: two measurements each of 2 loudspeaker and 3 microphone positions (total of 12 independent measure- ments).Measurement equation A16,0A=⋅V Tm²Measurement of sound leveldifferenceMinimum of 2 loudspeaker positions and rotating microphones.Measurement equation RLR =1−L2+10⋅lgS Ain dBLEGEND A L1 L2 R T V S