Describes an acoustic coupler for loading supra-aural audiometric earphones as specified in ISO 389 with a specified acoustic impedance, when calibrating audiometers, in the frequency range of 125 Hz to 8 000 Hz.
Cancels and replaces IEC 60303 (1970).
WITHDRAWN
IEC 60318-3:1998 ED1
99.60
Withdrawal effective
Dec 11, 2014
PUBLISHED
IEC 60318-3:2014 ED2