The standard stipulates that the boundary noise of social life noise emission sources shall not exceed the prescribed emission limit.
1 In general, the measuring point is selected at the position of 1 m outside the boundary of the social life noise emission source, with a height greater than 1.2 m and a distance not less than 1 m from any reflecting surface. When there is a fence around the factory boundary and there is an affected noise-sensitive structures, the measuring point should be selected outside the factory boundary 1m, 0.5m above the fence. When the actual emission of the sound source cannot be measured at the boundary (such as the sound source is located at a high altitude and the boundary is equipped with a sound barrier, etc.). ), the measuring point shall be set according to the general requirements, and another measuring point shall be set at the outdoor 1 m of the affected noise-sensitive structures. When measuring indoor noise, the indoor measuring point should be set at least 0.5m away from any reflecting surface and at a height of 1.2m from the ground. When measuring, the window in the direction affected by noise should be opened.
The fixed equipment structure of social life noise emission source transmits sound to indoor noise-sensitive structures. When measuring indoors in noise-sensitive structures, the measuring point should be at least 0.5m away from any reflecting surface, at least 0.2m away from the ground, and at least 0.2m away from the external window. When measuring, the window should be closed. Other sound sources that may interfere with the measurement in the room under test, such as TV sets, air conditioners, exhaust fans, fluorescent lamps with loud ballasts, and clocks that make noise during work, should be turned off.