Noise Level Data｜噪音指数

The Measurements of noise levels are made in accordance with CNS 8753 (which is very close to DIN 45635) ,which is being tested in a sound proof chamber with a sound level Lp<15dBA. A elastic mounts supported microphone is placed 1 meter from the center line of the fan during the test. The fan is running without any resistance to airflow.

测量噪音箱是根据 CNS8753（非常接近 DIN45635），在一个 LP<15dBA 的无回响室中测得，置换一个收音器在一个可伸缩性的平台上，距离风扇 1 米的中心线上来测量，风扇是在一个无阻力的条件下运转。



Sound Pressure Level(SPL) is environmentally dependent and is defined as SPL=20log10p/Pref,
and Sound Power Level (PWL) is defined as PWL= 10 log 10 W/Wref……
音压指效主要是由SPL=201p910p/Pre定义，音量指效主要是由PWL=1010g10w/Wref来

P=Pressure    压力
Pref=A reference pressure   参考压力
W=Acoustic power of the source   音响来源能量                                                                                   
Wref=An acoustic reference power   參考音响能量               



Fan noise data is usually plotted as Sound Pressure Level against the octave frequency bands.
风扇的噪音数据通常是由音压指数对比频率来纠正的