标准摘要
[中文适用范围]: 本国际标准提供了在一定频率范围内所需的校正信息,以便根据 IEC 61672-3 对声级计进行定期测试。这些更正包括: ?对声级计外壳反射和麦克风周围声音衍射的典型影响进行修正; ?对典型麦克风频率响应与无法测量实际麦克风响应的均匀频率响应的偏差进行修正; ?修正对指定挡风玻璃的典型麦克风和任何其他附件的频率响应的影响,这些附件是提交测试的特定声级计正常使用配置的一部分。本国际标准包括有关所需修正的测量不确定度的讨论。在某些情况下,会给出制造商或测试实验室允许的最大扩展不确定度。此最大允许扩展不确定性排除了由于不同人工制品样本(例如@麦克风或挡风玻璃)的可变性而导致的任何成分。应该注意的是,如果每个单独的修正都引用了很大的测量不确定度@,当它们组合起来考虑被测声级计的配置@时,很大的单独的不确定度可能会导致不符合最大允许值。 IEC 61672-1:??1 表 A.1 中给出的测量不确定度扩大,因此声级计不符合 IEC 61672-1 此外@本国际标准描述了在感兴趣的频率范围@并解释声级计制造商引用的校准检查频率的调整值(IEC 61672-3也有要求) 当声级计制造商建议使用声音校准器@比较耦合器@或静电执行器,用于定期测试声级计在不同频率下的声学响应@本国际标准描述了将声级计上的指示调整到等效自由场声级所需的校正的测量方法@在感兴趣的频率范围内。这些修正与特定型号的声音校准器@比较耦合器或静电执行器@麦克风和声级计(IEC 61672-3 也要求)相关。本国际标准的目的是确保校准检查频率的调整值和所有校正均使用一致且适当的方法确定。制造商将使用本国际标准来确定根据 IEC 61672-2@ 执行型式评估测试的实验室以及根据 IEC 61672-3 执行定期测试的实验室的调整值和修正@。根据 IEC 61672-3 进行定期测试的实验室还需要参考本国际标准,以确保制造商引用的修正的扩展测量不确定度不超过最大允许值。使用本国际标准中给出的方法获得的校正是使用设备样品进行测量的结果。这些修正可能无法完全代表所有生产批次或一段时间内的情况。建议定期重复测量,以确保无需更改说明手册中规定的校正值。本国际标准并未具体涵盖声级计配备用于随机入射声场@的麦克风的情况,如 IEC 61183 中给出的信息。 [外文原描述]: IEC 62585:2012 provides information on the corrections required over a range of frequencies in order for a periodic test of a sound level meter to be performed according to IEC 61672-3. These corrections include; corrections for the typical effects of reflections from the case of the sound level meter and diffraction of sound around the microphone; corrections for the deviation of the typical microphone frequency response from a uniform frequency response, where the actual microphone response cannot be measured; and corrections for the influence on the frequency response of a typical microphone of a specified windscreen and any other accessory that is part of the configuration for normal use of the particular sound level meter submitted for testing. This International Standard includes discussion about uncertainties of measurement of the required corrections. In some instances a maximum permitted expanded uncertainty for the manufacturer or testing laboratory is given. The aim of this International Standard is to ensure that the adjustment value at the calibration check frequency and all corrections are determined using consistent and appropriate methods. It is intended that this International Standard will be used by manufacturers to determine adjustment values and corrections, by laboratories performing pattern evaluation tests according to IEC 61672-2, and by laboratories performing periodic tests according to IEC 61672-3. Laboratories performing periodic tests according to IEC 61672-3 will also need to consult this International Standard to ensure that the expanded uncertainties of measurement for the corrections quoted by the manufacturer do not exceed the maximum permitted values.
英文名称Electroacoustics - Methods to determine corrections to obtain the free-field response of a sound level meter