电声学.音响校准器

[中文适用范围]： 本文件规定了三类声音校准器的性能要求：LS 类（实验室标准）、1 类和 2 类。LS 类仪器的验收限值最小，2 类仪器的验收限值最大。 LS 级声音校准器通常仅在实验室中使用； 1 级和 2 级被视为现场使用的声音校准器。根据 IEC 61672-1 的规定，1 级声音校准器主要与 1 级声级计一起使用，2 级声音校准器主要与 2 级声级计一起使用。 LS 类声音校准器的验收限制基于 IEC 61094-1 中指定的实验室标准传声器的使用，以证明符合本文件的要求。 1 类和 2 类声音校准器的验收限制基于 IEC 61094-4 中规定的工作标准麦克风的使用，以证明符合本文件的要求。为了促进声音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“模式评估测试”、附录 B“定期测试”、附录 C“模式评估报告”和两个资料性附录 - 附录 D “公差区间、相应的接受区间和最大允许测量不确定度之间的关系”和附件 E“符合本文件规范的评估示例”。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。声音校准器可以提供其他功能，例如突发音调。本文档中不包括对这些其他功能的要求。 [外文原描述]： 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.