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

• For checking the sound which is generated from home appliances such as vacuum and laundry machine, measuring the loudness (sone) becomes common as well as sound level measurement (dBA). The loudness is used as value index for evaluation of improvement effect before and after countermeasures for noise reduction. The value of loudness (sone) falls by half in proportion to human hearing sound. By comparing the loudness values before and after the countermeasures, you can confirm the efficiency of improvement.
• All measurement data of the LA-7500 precision sound level meter can be stored in SD card. By connecting the main unit of sound level meter to the PC via USB interface or inserting the SD card into the card slot of the PC, the stored data can be transferred without any exclusive software. You can perform the measurement data freely as secondary processing with the spreadsheet software etc.