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IEC 60711:1981 ed1.0

Заменен
Occluded-ear simulator for the measurement of earphones coupled to the ear by ear inserts — 24 стр.
Specifies an occluded-ear simulator, intended for the calibration of insert earphones in the frequency range 100 Hz to 10 000 Hz in terms of the sound pressure at the eardrum.
ICS
17.140.50 Electroacoustics. Including sound level meters / Электроакустика. Включая слуховые аппараты и шумомеры