This part of IEC 621 27 specifies relevant hydrophone characteristics.
This standard is applicable to:
– hydrophones employing piezoelectric sensor elements, designed to measure the pulsed and continuous wave ultrasonic fields generated by ultrasonic equipment;
– hydrophones used for measurements made in water;
– hydrophones with or without an associated pre-amplifier.
![IEC 62127-3:2013](https://www.365standards.com/wp-content/uploads/2023/02/IEC-62127-3-2013.png)