4152  Artificial Ear/Ear Simulator (6cc 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 4152
In Artificial Ear Type 4152 the socket for mounting the measuring microphone permits use of a Brüel & Kjær 1-inch Condenser Microphone Cartridge Type 4144 with associated Preamplifier Type 2669 L (Adaptor DB-0962 required). The couplers (see Fig. 1) supplied with the Artificial Ear consist of a 2 cm³ Coupler DB-0138 in accordance with IEC 126 and ANSI S 3.7–1973 for measurements on hearing aid earphones, and a 6 cm³ Coupler, DB-0913, which fulfils the requirements of the NBS 9 A Coupler (United States National Institute of Standards and Technology, formerly the National Bureau of Standards) and the ANSI S3.6–1969 and IEC 303 Coupler for measurements on headphones. If required, a special 6 cm³ Coupler, DB-0161, designed according to the requirements of ANSI S 3.7–1973 Type 1 Coupler is available.

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