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IEC 60942-2017 pdf free

IEC 60942-2017 pdf free.Electroacoustics – Sound calibrators.
This document specifies the performance requirements for three classes of sound calibrator:
class LS (Laboratory Standard), class I 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 I 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 IEC 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 A “Pattern evaluation tests”, Annex B “Periodic tests”, Annex C “Pattern evaluation report”, and two informative Annexes — Annex 0 “Relationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement” and Annex E “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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
IEC 60050-801:1994, International Electrotechnical Vocabulary — Chapter 801: Acoustics and electroacoustics
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) — Part 4-2: Testing and measurement techniques — Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques — Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-20:2010, Electromagnetic compatibility (EMC) — Part 4-20: Testing and measurement techniques — Emission and immunity testing in transverse electromagnetic (TEM) wave guides
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-801 and the ISOIIEC Guide 99, and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http:I!www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
NOTE Definitions for other relevant quantities are given In the documents referenced in Clause 2.
sound calibrator
device that generates a sinusoidal sound pressure of specified sound pressure level and frequency when coupled to specified models of microphone in specified configurations
3.2 plstonphone
sound calibrator in which the sound pressure is generated in a fixed air volume by the motion of one or more pistons, creating a well-defined volume velocity
3.3 specified sound pressure level
sound pressure level(s) generated under reference environmental conditions for use with a particular microphone model and configuration, valid for either an individual Sound calibrator (in the case of a class LS calibrator) or all sound calibrators of the same model (in the case of a class 1 or class 2 calibrator).IEC 60942 pdf free download.

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