4153  Artificial Ear/Ear Simulator (IEC 60 318 coupler w/o microphone and preamplifier)

Artificial Ears Types 4152 and 4153 have been designed for measurements in the audiometric and related fields. They enable electroacoustical measurements on either insert earphones or headphones to be carried out under well defined acoustical conditions, which are of great importance for the comparability of different designs and the reproducibility of measurements.

Artificial Ears Types 4152 and 4153 consist of an acoustic coupler, a main housing containing the sockets for the connection of a Brüel & Kjær condenser microphone and a base plate with a mechanism for clamping the object being tested.

The clamping mechanism is spring loaded and provides a force which can be adjusted from 2 N (approx. 0.2 kg) to 10 N (approx. 1 kg) as recommended by the relevant ANSI Standards, the actual force value being set on a scale engraved on the clamp holder. To minimise the effect of vibration during the measurements, each Artificial Ear is isolated from shock and vibration by means of three soft rubber feet.

Artificial Ear Type 4153
Artificial Ear Type 4153 fulfils the requirements of IEC 318 and has an acoustical impedance basically similar to that of the human ear. The acoustic coupler (Fig. 3) contains three volumes ( V1 = 2.5 cm³, V2 = 1.8 cm³ and V3 = 7.5 cm³) acoustically connected in parallel by means of a narrow annular slit and four parallel holes. The slit and the four holes act as an acoustic resistance of 6.5 × 10 6 Ns/m⁵ and 20 × 106 Ns/m⁵ respectively, while their acoustic inductances are 5 × 102 Ns²/m⁵ for the slit and 104 Ns²/m⁵ for the holes. An electrical equivalent of the acoustic circuit is shown in Fig. 4.

The coupler fits Brüel & Kjær Falcon Range 1/2-inch Microphone Type 4192, and can be used with a Falcon...

For a full Description and Specifications, see Product Data