Simplified method of determining sound power levels from pumps using an anechoic chamber text London British Standards Institution 1985 monographic 14 p. Describes simplified procedures for the determination of the sound power levels of a hydraulic fluid power pump under controlled conditions of installation and operation using a quadrispherical microphone array in an anechoic chamber. These procedures provide a basis for comparing noise levels of pumps. Error correction, Hydraulic transmission systems, Noise (environmental), Free-field rooms, Acoustic measurement, Sound intensity, Installation, Testing conditions, Pumps, Hydraulic equipment 0580145158