Ear simulator 4185

Designed for measurements on handset telephones requiring an IEC 60318-1 coupler, including hansets with high ompedance earpiece where sealed conditions are required. Ear Simulator for Telephonometry Type 4185 is designed for measurements on handset telephones, including handsets with high impedance earpiece where sealed conditions are required. Type 4185 fulfils the requirements of the ITU–T P.57 Type 1 recommendation and the IEC 60318 standard. USE SCENARIOS Measurements on telephone handsets Earphone calibration Type 4185 consists of an acoustic coupler with built-in miniature sound source for seal checking, a microphone and a preamplifier. It fits directly into the Telephone Test Head Type 4602-B and can be used with a wide range of Brüel & Kjær telephone test systems.