標準號：SIS SS IEC 651-1986
中文標準名稱：音響效果．聲級計
英文標準名稱：Acoustics — Sound level meters
發布日期：1986/6/25 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 GeneralThis standard describes instruments (sound level meters) for the measurement of certain frequency and time weighted sound pressure levels.1.2 TypesThis standard specifies sound level meters of four degrees of precision, designated Types 0, 1, 2 and 3.1.3 TolerancesThe specifications for Types 0, 1, 2 and 3 sound level meters have the same centre values and differ only in the tolerances allowed. Tolerances generally broaden as the type number increases and differ for the various types to a degree which affects manufacturing costs significantly.1.4 Characteristics specifiedThis standard specifies the following characteristics of sound level meters:a) directional characteristics;b) frequency weighting characteristics;c) time weighting, detector and indicator characteristics;d) sensitivity to various environments.1.5 Tests specifiedThis standard specifies electrical and acoustical tests to verify compliance with the characteristics specified (see Sub-clause 1.4). It also describes the method for absolute sensitivity calibration.