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NATIONAL BUREAU OF STANDARDS HEARING AID TEST
This work was supported by contracts with the Prosthetics
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20 BANDS dB 80 Input level AVERAGE INSERTION GAIN Battery drain Battery voltage BATTERY:M675 NBS CODE CD CD CD coil output level CONTROL AT MAXIMUM CONTROL AT REDUCED DATE TESTED DATA displayed for high distortion above 800 distortion with input earmold Equivalent input noise FREQ Hz GAIN IN 20 Harmonic distortion hearing aid models i i i i i i i i Induction coil output Input level dB input noise level input noise level=65 input signal input spl dB input spl=70 dB kHz dB lateral field 10mA/m loudspeaker manikin Maximum distortion MAXIMUM GPIN MAXIMUM SETTING Gain measured NBS CODE SERIAL noise level dB noise level=65 dB noise signal dB OBTAINED WITH VOLUME OE OE OE output level dB REDUCED SETTING Gain rH rH rH shaped input noise shaped noise signal SSPL for shaped TESTED DATA OBTAINED type hearing aids VOLUME CONTROL