scope:

This part of ISO 4412 specifies a test code describing procedure s based on ISO 2204 for the determination of the sound power lev els of a hydraulic fluid power motor under controlled conditions of installation and operation, suitable for providing a basis f or comparing the noise levels of motors in terms of: A-weighted sound power level; octave band sound power levels. - From these sound power levels, reference sound pressure levels may be calcu lated for reporting purposes (see clause 13). For general purpos es, the frequency range of interest includes the octave bands wi