Establishment of Measurement System for Hearing Aids at TUBITAK UME

Hearing devices in many different brands and types are used in our country. However, these hearing aids before being placed on the market do not pass mandatory/legal technical measurements. To verify that hearing aids work in a specified performance, measurements are always required to be done on the basis of scientific parameters and standards. For this purpose, the acoustic cabinet, microphone, ear simulator, analyzer and software-aided system was established in TUBITAK UME Medical Metrology Laboratory. The acoustic field generated by the sound source within the acoustic cabinet is analyzed with the reference microphone and ear simulator. In this set-up system, performance parameters such as acoustic impedance measurements in the range of between 100 Hz and 10 kHz, sensitivity, frequency response and noise insulation value are measured. In this paper, performance parameters' measurements of the sound pressure level of headphones that are designed specifically for musicians in Turkey are presented in 2.0 dB uncertainty.