电声学.声音校准器

[中文适用范围]： 本文件规定了三类声校准器的性能要求：LS类（实验室标准）、1类和2类。LS类的容差接受限最小，2类仪器的容差接受限最大。LS类声校准器通常仅在实验室使用；1类和2类被视为现场使用的声校准器。如IEC 61672-1所规定，1类声校准器主要用于与1类声级计一起使用，2类声校准器主要用于与2类声级计一起使用。 LS类声校准器的容差接受限基于使用实验室标准麦克风，如IEC 61094-1所规定，以证明符合本文件的要求。1类和2类声校准器的容差接受限基于使用工作标准麦克风，如IEC 61094-4所规定，以证明符合本文件的要求。 多级和多频声校准器对于其说明书声明符合本文件要求的所有声压级和频率组合都具有相同的类别指定。 为了促进声校准器测试的一致性和易用性，本文件包含三个规范性附录——附录A“型式评价测试”、附录B“定期测试”、附录C“型式评价报告”，以及两个信息性附录——附录D“容差区间、相应接受区间和测量最大允许不确定度之间的关系”和附录E“符合本文件规范的示例评估”。 本文件不包括等效自由场或随机入射声压级的要求，例如可用于声级计整体灵敏度调整的要求。 声校准器可以提供其他功能，例如突发音调。这些其他功能的要求不包括在本文件中。 [外文原描述]： IEC 60942:2017 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. IEC 60942:2017 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. 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. This fourth edition cancels and replaces the third edition published in 2003, of which it constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) deletion of the class designations, class LS/C, class 1/C and class 2/C; b) addition of two further class designations, class LS/M and class 1/M, specifically for pistonphones; c) addition of an amended criterion for assessing conformance to a specification: conformance is now demonstrated when (a) measured deviations from design goals do not exceed the applicable acceptance limits and (b) the uncertainty of measurement does not exceed the corresponding maximum-permitted uncertainty; d) modification to the short-term level fluctuation test of the sound pressure level stability; e) change to some environmental test conditions to avoid icing; f) addition of an alternative test for immunity to radio-frequency fields using transverse electromagnetic (TEM) waveguides.