System for Metrological Certification of Hydrophones

The system is intended for the metrological certification (calibration in pressure units) of vectorial sound pressure receivers (i.e., receivers for the sound pressure gradient) and measurement hydrophones by the method of substitution under the conditions of a "free" field in an anechoic hydroacoustic basin of dimensions 21x7x7 m3 in a tone or noise mode of operation in the frequency range 0.08-20 kHz.