电声学.声级计.第3部分:周期性试验

[中文适用范围]： 本标准第二版描述了针对符合IEC 61672-1第二版1级或2级规格的时间加权、积分平均和积分声级计的定期测试程序。标准目的是确保所有实验室以一致的方式执行定期测试。 注1：本文件中，对IEC 61672-1、IEC 61672-2和IEC 61672-3的引用均指第二版，除非另有说明。 注2：针对符合IEC 61672-1:2002规格的声级计的定期测试程序在IEC 61672-3:2006中给出。 定期测试的目的是向用户保证声级计的性能在有限的关键测试和环境条件下符合IEC 61672-1的适用规格。 本标准中的测试范围被有意限制为定期测试所需的最低限度。 本版IEC 61672-3中描述的定期测试适用于制造商声称符合IEC 61672-1第二版规格的声级计。这些测试适用于已通过或未通过独立测试机构模式批准的声级计，该机构根据IEC 61672-2第二版的测试程序负责模式批准。 由于定期测试范围有限，如果模式批准的证据不公开，即使定期测试结果符合本版IEC 61672-3的所有适用要求，也不能得出符合IEC 61672-1规格的一般结论。 [外文原描述]： IEC 61672-3:2013 describes procedures for periodic testing of time-weighting, integrating-averaging, and integrating sound level meters that were designed to conform to the class 1 or class 2 specifications of the second edition of IEC 61672-1. The aim of the standard is to ensure that periodic testing is performed in a consistent manner by all laboratories. The purpose of periodic testing is to assure the user that the performance of a sound level meter conforms to the applicable specifications of IEC 61672-1 for a limited set of key tests and for the environmental conditions under which the tests were performed. Periodic tests described in this edition of IEC 61672-3 apply to sound level meters for which the manufacturer claims conformance to the specifications of the second edition of IEC 61672-1. Periodic tests described in IEC 61672-3 apply to sound level meters for which the model has been, or has not been, pattern approved by an independent testing organization responsible for pattern approvals in accordance with the test procedures of the second edition of IEC61672-2. This second edition cancels and replaces the first edition published in 2006. This second edition constitutes a technical revision. The main changes with regard to the previous concern conformance to specifications which is now demonstrated when measured deviations from design goals do not exceed the applicable acceptance limits, and when the uncertainty of measurement does not exceed the corresponding maximum-permitted uncertainty, with both uncertainties determined for a coverage probability of 95 %. In this document, references to IEC 61672-1, IEC 61672-2, and IEC 61672-3 refer to the second editions unless stated otherwise. Procedures for the periodic testing of sound level meters designed to conform to the specifications of IEC 61672-1:2002 were given in IEC 61672-3:2006.