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Standards Development
The primary function of a sound calibrator is to generate a sinusoidal sound pressure of specified level and frequency when coupled to specified models of microphone in specified configurations.
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 IEC 61672-1, and with a personal sound exposure meter, as specified in IEC 61252: 2025 [3].
To promote consistency of testing of sound calibrators and ease of use, this document contains normative information on pattern evaluation tests and periodic tests, and informative information on 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.
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