Measurement of noise emitted by machines; airborne noise emission; enveloping surface method and special reverberation room method; household and similar electrical appliances; particular requirements for washing machines and spin extractors (IEC 60704-2-4:1989); german version HD 423.2.4 S1:1989— 9 стр.
Acoustics - Determination of sound power levels of noise sources using sound pressure - Engineering method in an essential free field over a reflecting plane (ISO 3744:1994); German version EN ISO 3744:1995— 28 стр.
