IEC 60645-1:20 17 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 60645-1:20 17规定了设计用于确定听力阈值水平的听力计的一般要求，相对于通过心理声学测试方法建立的标准参考阈值水平，以及设计用于使用语音材料执行心理声学测试的听力计。 本标准的目的是确保: a）在给定人耳上用不同纯-符合该标准的音调听力计给出基本相同的结果； b)所获得的结果代表被测耳朵的听力与参考听力阈值之间的有效比较； c)提供了一种以标准化方式向受试者呈现语音材料的装置。这将确保当使用符合本标准的不同听力计进行时，使用特定语音信号和特定信号呈现方式的听力测试给出基本相同的结果； d）根据听力计所呈现测试信号范围、根据操作模式或根据其假定的主要应用对听力计进行分类。 本第四版取消并取代了2012年出版的第三版和第一版IEC 60645-2，1993年出版。本版构成技术修订版。 该版本现在将纯音（IEC 60645-1的早期版本）和语音听力计（IEC 60645-2的早期版本）的要求纳入一个文档。此版本中的技术要求与前两个文件的意图相似，但现在消除了由适用于听力计的两个不同审查周期的独立标准引起的技术和编辑矛盾。

IEC 60645-1:2017 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 60645-1:2017 specifies general requirements for audiometers designed for use in determining hearing threshold levels, relative to standard reference threshold levels established by means of psychoacoustic test methods, and those designed to perform psychoacoustic tests using speech material.
The object of this standard is to ensure:
a) that tests of hearing in the frequency range 125 Hz to 16 kHz on a given human ear, performed with different pure-tone audiometers which comply with this standard, give substantially the same results;
b) that the results obtained represent a valid comparison between the hearing of the ear tested and the reference threshold of hearing;
c) that a means of presenting speech material to a subject in a standardized manner is provided.  This will ensure that tests of hearing using a specific speech signal and a specific manner of signal presentation, when performed with different audiometers which comply with this standard, give substantially the same results;
d) that audiometers are classified according to the range of test signals they present, according to the mode of operation or according to their presumed primary application.
This fourth edition cancels and replaces the third edition, published in 2012, and the first edition IEC 60645-2, published in 1993. This edition constitutes a technical revision.
This edition now includes the requirements for both pure-tone (prior edition of IEC 60645-1) and speech audiometers (prior edition of IEC 60645-2) into a single document. The technical requirements in this edition remain similar to the intent of the prior two documents, but now eliminate technical and editorial contradictions caused by two separate standards with different review cycles applying to an audiometer.