这是ANSI/ASA S1的一部分。4/IEC 61672描述了时间加权、积分平均和积分声级计的定期测试程序，这些声级计的设计符合ANSI/ASA S1的1级或2级规范。4-2014/第1部分/IEC 61672-1。定期测试的目的是向用户保证声级计的性能符合IEC 61672-1的适用规范，适用于有限的一组关键测试和进行测试的环境条件。ANSI/ASA S1本部分中的测试范围。4/IEC 61672故意限制在最低限度 被认为是定期测试所必需的。本版ANSI/ASA S1中描述的定期试验。4/第3部分/IEC 61672-3适用于声级计 制造商声称符合IEC 61672第二版的规范- 1.ANSI/ASA S1本部分所述的定期试验。4/IEC 61672适用于 该模型已经或尚未得到独立测试机构的模式批准 负责按照IEC 61672-2第二版的测试程序进行型式认证。由于周期性试验的范围有限，如果型式认证的证据不公开，即使周期性试验的结果符合本版ANSI/ASA S1的所有适用要求，也不能就是否符合IEC 61672-1的规范得出一般结论。4/第3部分/IEC 61672-3。

This part of ANSI/ASA S1.4 / IEC 61672 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 ANSI/ASA S1.4-2014/Part 1 / IEC 61672-1.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.The extent of the tests in this part of ANSI/ASA S1.4 / IEC 61672 is deliberately restricted to the minimum considered necessary for periodic tests.Periodic tests described in this edition of ANSI/ASA S1.4/Part 3 / 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 this part of ANSI/ASA S1.4 / IEC 61672 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 IEC 61672-2.Because of the limited extent of the periodic tests, if evidence of pattern approval is not publicly available, no general conclusion about conformance to the specifications of IEC 61672-1 can be made, even if the results of the periodic tests conform to all applicable requirements of this edition of ANSI/ASA S1.4/Part 3 / IEC 61672-3.