BS 7458-1(1991) : 1991被替代
TEST CODE FOR THE MEASUREMENT OF AIRBORNE NOISE EMITTED BY ROTATING ELECTRICAL MACHINERY - ENGINEERING METHOD FOR FREE-FIELD CONDITIONS OVER A REFLECTING PLANE
出版：British Standards Institution
专家解读视频
Describes an engineering method for measuring the sound pressure levels on a rectangular parallelepiped surface enveloping the machine and for calculating the sound power level produced by the machine. It outlines the procedures which may be used to evaluate the test environment and specifies the characteristics of measuring instruments. Covers acoustic environment, instrumentation, installation and operation of the machine, sound pressure levels on measurement surface, calculation of surface sound pressure level and sound power level, information to be recorded and reported, qualification procedures for the acoustics environment and procedures for calculating A-weighted sound power level from octave or one-third octave band power levels.
