GB/T 17248.2-2018
聲學 機器和設備發射的噪聲 在一個反射面上方可忽略環境修正的近似自由場測定工作位置和其他指定位置的發射聲壓級
Acoustics—Noise emitted by machinery and equipment—Determination of emission sound pressure levels at a work station and at other specified positions in an essentially free field over a reflecting plane with negligible environmental corrections
GBT17248.2-2018, GB17248.2-2018