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騒音レベル

　

騒音の測定は無響室（騒音は20dBA以下）においてファンを宙吊りにして、吸込面より1ｍの所で測定した中心値です。

Sound pressure level (SPL) which is environmentally dependent and sound power level (PWL) are defined as SPL = 20 log10 P/Pref

SPL = 20 log10 P/Pref

PWL = 10 log10 W/Wref

P =Pressure

Pref= A reference pressure

W =Acoustic power of the source

Wref =An acoustic reference power

Fan noise data is usually plotted as Sound Power Level against the octave frequency bands.

The measurement standard is according to : CNS 8753(which is comparable to DIN 45365)