Soft dB Opus Suite Building Acoustics Module Airborne Sound Isolation between Rooms ASTM E 336_ISO 140-4 - Manual (Page 9)

8
Step 2 Do a Level Measurement
To proceed to a measurement, select an element to measure in the table of the main panel and click
the button to open the measurement interface.
Once in the measurement panel, click on the button to start the average
measurement. The acquisition end by itself once the average period is reached (as set in setup) and
can be stopped at any time.
Click on the button to accept the measurement.
• An omnidirectional should be used
• Source at least 5 m away from the partition if possible. Otherwise, in the opposite corners
of the room.
• If several source positions, the distance between positions should be at least 2 m.
• For a fixed position measurement, the averaging time should be at least 10 seconds.
• For a moving average measurement, the averaging time should be at least 30 seconds.
• The microphones must be kept more than 1 m away from the tested partition.
• If possible, the microphones should be kept more than 1 m away from all other major
extended surface or 0.5 m away otherwise.
• The microphones should be kept way from the source: >1m if room <25m³, >1.5m if room
<100m³, >2m if room >100m³.
• If fixed microphone positions is used, at least 6 positions (as least 1 m apart) should be
used for each room.
• If moving microphones is used, the microphone speed should not exceed 0.5 m/s.
Start the
Average
Accept the
measurement