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IEC 60565A:1980 ed1.0

Заменен
First supplement — 24 стр.
Specifies, for hydrophones, a calibration method with a pistonphone, between 1 Hz and 50 Hz, and a calibration method with a vibrating column, between 10 Hz and 3 kHz.
ICS
17.140.50 Electroacoustics. Including sound level meters / Электроакустика. Включая слуховые аппараты и шумомеры