標準號：SIS SS-ISO 3744-1985
中文標準名稱：聲學．噪聲源聲功率級測定．反射面上自由場條件的設計方法
英文標準名稱：Acoustics — Determination of sound power teves of noise sources — Engineering methods for free-field conditions ?ver a reflecting plane
發布日期：1985/5/15 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：This International Standard specifies engineering methods for measuring the sound pressure levels on a measurement surface enveloping the source and for calculating the sound power level produced by the source. It gives requirements for the test environment and instrumentation as well as techniques for ob-taining the surface sound pressure level from which the A-weighted sound power level of the source and octave or one-third octave band sound power levels are calculated.This International Standard is concerned with specification of the basic acoustic requirements for the measurement of noise under free-field conditions ?ver a reflecting plane. It is impor-tant that specific test codes for various types of equipment be established and used as the basis for measurements according to this International Standard. Such test codes will, for each type of equipment, give detailed requirements on mounting, loading and operating conditions for the equipment under test as well as descriptions of the measurement surface, the number of microphone positions, and the measurement distance to be used.The use of different measurement surfaces may yield differing estimates of the sound power level of a source. Measurements on a given family of equipment should all be based on the same shape of measurement surface. The test code for a particular type of equipment should give detailed information on the particular measurement surface that is selected.