IEC TS 62903:2023作为IEC TS 62903:2023 RLV提供，其中包含国际标准及其红线版本，显示了与上一版本相比技术内容的所有变化。IEC TS 62903:2023: a)建立了超声换能器标定的自由场会聚球面波自互易法， b)建立使用自互易法确定换能器的电声参数和声输出功率所需的测量条件和实验程序， c)建立用于检查这些换能器的互易性和聚焦场的线性范围的标准，以及 d)为评估辐射电导的总体测量不确定度提供指导信息。 本文件适用于:1)在线性振幅范围内工作的无中心孔的圆形球面弯曲凹聚焦换能器， 2)在0.5 MHz至15MHz的频率范围内的测量，以及 3)聚焦场中在线性振幅范围内的声压振幅。 使用互易法的水听器的表征和灵敏度校准在本文件中没有涉及，但在IEC 62127-2和IEC 60565-1中有涉及。 IEC TS 62903:2023取消并取代了2018年发布的第一版。本版构成技术修订版。与上一版相比，此版本包括以下重大技术变更: a)在定义和正文中，几个量被认为是复值量。 b)增加附件I以提供典型测量范围并提供示例校准结果。

IEC TS 62903:2023 is available as IEC TS 62903:2023 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.

IEC TS 62903:2023:
a ) establishes the free-field convergent spherical wave self-reciprocity method for ultrasonic transducer calibration,
b) establishes the measurement conditions and experimental procedure required to determine the transducer's electroacoustic parameters and acoustic output power using the self-reciprocity method,
c) establishes the criteria for checking the reciprocity of these transducers and the linear range of the focused field, and
d) provides guiding information for the assessment of the overall measurement uncertainties for radiation conductance.
This document is applicable to:
1) circular spherically curved concave focusing transducers without a centric hole working in the linear amplitude range,
2) measurements in the frequency range 0,5 MHz to 15 MHz, and
3) acoustic pressure amplitudes in the focused field within the linear amplitude range.
Characterization and sensitivity calibration of hydrophones using the reciprocity method are not addressed in this document but covered in IEC 62127-2 and IEC 60565-1.
IEC TS 62903:2023 cancels and replaces the first edition published in 2018. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) Several quantities are recognized as complex-valued quantities in the definitions and in the main text.
b) Annex I was added to provide typical measurement ranges and to provide example calibration results.