BS EN IEC 60942:2018

This document specifies the performance requirements for three classes of sound calibrator: class LS (Laboratory Standard), class 1 and class 2. Acceptance limits are smallest for class LS and greatest for class 2 instruments. Class LS sound calibrators are normally used only in the laboratory; class 1 and class 2 are considered as sound calibrators for field use. A class 1 sound calibrator is primarily intended for use with a class 1 sound level meter and a class 2 sound calibrator primarily with a class 2 sound level meter, as specified in IEC61672‑1 . The acceptance limits for class LS sound calibrators are based on the use of a laboratory standard microphone, as specified in IEC61094‑1 , for demonstrations of conformance to the requirements of this document. The acceptance limits for class 1 and class 2 sound calibrators are based on the use of a working standard microphone, as specified in IEC61094‑4 , for demonstrations of conformance to the requirements of this document. To promote consistency of testing of sound calibrators and ease of use, this document contains three normative annexes – AnnexA \'Pattern evaluation tests\', AnnexB \'Periodic tests\', AnnexC \'Pattern evaluation report\', and two informative Annexes – AnnexD \'Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement\' and AnnexE \'Example assessments of conformance to specifications of this document\'. This document does not include requirements for equivalent free-field or random-incidence sound pressure levels, such as can be used in the overall sensitivity adjustment of a sound level meter. A sound calibrator can provide other functions, for example, tonebursts. Requirements for these other functions are not included in this document.