BRUEL & KJAER 4185, User Manual

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1 Ear Simulator for Telephonometry Type 4185
User Manual
Chapter 1
Description
Fig.1.1 Ear Simulator for Telephonometry Type 4185
Ear Simulator for Telephonometry Type 4185 is designed for telephone
measurements requiring an IEC 60318–1 coupler. Type 4185 converts
the acoustic signal from an earphone into an electrical equivalent that
takes into account the response of the human ear. It enables
electroacoustic measurements on telephone handsets to be carried
out under well-defined acoustical conditions.
Type 4185 fulfils the requirements of Rec. ITU-T P.57 Type 1 and
IEC 60318–1 as well as all relevant ITU-T, IEEE and BS
recommendations.