IEC 60866:1987 Characteristics and calibration of hydrophones for operation in the frequency range O.5 MHz to 15 MHz was changed to IEC 62127-1:2007 Ultrasonics - Hydrophones - Part 1: Measurement and characterization of medical ultrasonic fields up to 40 MHz.
IEC 60866:1987 Characteristics and calibration of hydrophones for operation in the frequency range O.5 MHz to 15 MHz was changed to IEC 62127-2:2007 Ultrasonics - Hydrophones - Part 2: Calibration for ultrasonic fields up to 40 MHz.
IEC 60866:1987 Characteristics and calibration of hydrophones for operation in the frequency range O.5 MHz to 15 MHz was changed to IEC 62127-3:2007 Ultrasonics - Hydrophones - Part 3: Properties of hydrophones for ultrasonic fields up to 40 MHz.
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