IEC 60942:2017 RLV包含国际标准及其红线版本。红线版本只有英文版本。Redline版本为您提供了一种快速简单的方法来比较该标准与其前一版本之间的所有变化。红线版本不是IEC官方标准，只有标准的当前版本才被视为官方文件。 IEC 60942:2017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类仪器的可接受限度最小，2类仪器的可接受限度最大。LS级声音校准器通常仅在实验室使用；1类和2类被认为是现场使用的声音校准器。1类声音校准器主要用于1类声级计，2类声音校准器主要用于2类声级计，如IEC 61672-1.LS级声音校准器的验收限值基于IEC 61094-1中规定的实验室标准麦克风的使用，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值基于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。第四版取消并取代了2003年出版的第三版，这是对第三版的技术修订。与上一版相比，此版本包括以下重大技术变更: a)删除类别名称LS/C类、1/C类和2/C类； b)增加另外两个类别名称，LS/M类和1/M类，特别是用于活塞式电话；c)添加用于评估符合规范的修订标准:现在，当(a)与设计目标的测量偏差不超过适用的验收限值并且(b)测量不确定度不超过相应的最大允许不确定度时，即可证明符合性； d)对声压级稳定性的短期级波动测试的修改； e)改为某些环境试验条件以避免结冰； f)增加使用横向电磁(TEM)波导的射频场抗扰度的替代测试。

IEC 60942:2017 RLV contains the International Standard and its Redline version. The Redline version is available in English only. The Redline version provides you with a quick and easy way to compare all the changes between this standard and its previous edition. The Redline version is not an official IEC Standard, only the current version of the standard is to be considered the official document.

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.