<JIS Z 8731 "Description and measurement of environmental noise" >
Please refer to also ISO 1996

Example of sound level measurement of working environment

• Measurement A: Measurement at the working area where the sound level is nearly homogeneous; Set sound level meters above the floor surface at 1.2m to 1.5m on the cross points (more than five points) of vertical and horizontal lines which are made at even intervals (6m or less for each side). And then, the time-average sound level (equivalent continuous sound level L_eq) for ten minutes can be measured.
  Measurement B: Measurement at the working area near the sound source; Set the sound level meters on the working points when the sound level is expected to be the highest. And then, the time-average sound level (equivalent continuous sound level, L_eq) for ten minutes can be measured.
  After A and B measurements, each result is evaluated in order to take measures for the improvement in working area.
• The LA-1441A integrating sound level meter can store the data of sound pressure level at each point in the internal memory and recall them. Also, the stored measurement data can be transmitted to the PC via USB or RS-232C interface.