scope:

The 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. This standars specifiec 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. This standard specifies electrical and acoustical tests to verify compliance with the characteristics specified. It also describes the method for absolute sensitivity calibration.