IEC 60942:2017 free download

10-01-2020 comment

IEC 60942:2017 free download.Electroacoustics – Sound calibrators.The size of this pdf file is 101M.
Sound calibrators are designed to produce one or more known sound pressure levels at one or more specified frequencies when coupled to specified models of microphone in specified configurations, for example, with or without protective grid. The sound pressure level generated by some sound calibrators depends on the static pressure.
Sound calibrators have rincipal applications:
a) the determination of the electroacoustical pressure sensitivity of specified models of microphone in specified configurations;
b) checking or adjusting the overall sensitivity of acoustical measuring devices or systems.
This document specifies the performance requirements for three classes of sound calibrate 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 IEC 61672-1.
The acceptance limits for class LS sound calibrators are based on the use of a laboratory standard microphone, as specified in EC 61094-1, 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 IEC 61094-4, 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-Annex APattern evaluation tests”Annex B Periodic sts Anne C “Pattern evaluation report”, and two informative Annexes- Annex D
“Relationship between tolerance interval, corresponding acceptance interval and the aximum-permitted uncertainty of measurement” and Annex E “Example assessments of conformance to specifications of this document”.

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