การตั้งไมโครโฟนของมาตรระดับเสียงที่

Set the microphone of the sound level inside the standard building, floor area of not less than. 1.20 metres in radius of 1.00 m along the Plains around the microphone. There must not be an obstacle to any other thing that has the ability to reflect sound obstructed. And away from the window, or an open channel out of the building by at least. 1.50 m.

The microphone of the sound level meter inside the building to a height of not less than 1.20 meter by 1.00 meter horizontal radius around the microphone. Have no walls at all, has the ability to resonate obstructed. And being away from the window or outside lane open at least 1.50 meters.

The microphone sound level meter area within the building to set high from the ground less than 1. 20 meters in radius. 1.And if meters horizontally around the microphone. No other features wall reflection of sound barrier. And away from the window or channel open out of the building at least 1. 50 meters.