Supplements IEC Publication 565 by clause 10: calibration with a pistonphone and clause 11: calibration with a vibrating column. The first method allows a calibration in a simple way inside a chamber partly filled with water, at low frequencies at which
IEC 60565A:1980 history
2006IEC 60565:2006 Underwater acoustics - Hydrophones - Calibration in the frequency range 0,01 Hz to 1 MHz
IEC 60565A:1980 Calibration of hydrophones. was changed to IEC 60565:2006 Underwater acoustics - Hydrophones - Calibration in the frequency range 0,01 Hz to 1 MHz.