IEC 60565的本部分规定了水听器的自由场校准方法和程序，以及可用作水听器（接收器）和/或投影仪（源传感器）的单个电声传感器。本文件涵盖了两种一般类型的校准:使用三传感器球面波互易法的绝对校准，以及通过与参考进行比较的相对校准 已进行绝对校准的设备。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This part of IEC 60565 specifies methods and procedures for free-field calibration of hydrophones, as well as individual electroacoustic transducers that can be used as hydrophones (receivers) and/or projectors (source transducers). Two general types of calibration are covered within this document: absolute calibration using the method of threetransducer spherical-wave reciprocity, and relative calibration by comparison with a reference device which has already been the subject of an absolute calibration.All current amendments available at time of purchase are included with the purchase of this document.