標(biāo)準(zhǔn)號(hào)：ISO 6926-1999
中文標(biāo)準(zhǔn)名稱：聲學(xué) 聲功率級(jí)測(cè)定用的基準(zhǔn)聲源的性能和校正的要求
英文標(biāo)準(zhǔn)名稱：Acoustics - Requirements for the performance and calibration of reference sound sources used for the determination of sound power levels
標(biāo)準(zhǔn)類型：A59;Z32
發(fā)布日期：1999/12/31 12:00:00
實(shí)施日期：1999/12/31 12:00:00
中國(guó)標(biāo)準(zhǔn)分類號(hào)：A59;Z32
國(guó)際標(biāo)準(zhǔn)分類號(hào)：17.140.01
適用范圍：This International Standard specifies the acoustical performance requirements for reference sound sources: — temporal steadiness and repeatability of the sound power output, — spectral characteristics, — directivity index. The stability of the sound power output and the directivity index, for those sources where directivity is needed, are normally only determined in connection with pattern evaluation of the reference sound source. Because of the directivity measurements (for an exception see 5.5), pattern evaluations can only be performed in a hemi-anechoic environment. For regular verification measurements, only the frequency band sound power levels are normally determined. In this case measurements may be made in either hemi-anechoic or reverberant conditions. This International Standard also specifies procedures for calibrating a sound source intended for use as a reference sound source in terms of its sound power level under the reference condition that the characteristic impedance of air (pc) is equal to 400 Ns/m