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1.
Description
General.
The Artificial Ear Type 415! is designed to enable acoustical measurements
on earphones to be carried out under well-defined acoustical
conditions.
It consists basically of a replaceable acoustical coupler, and two sockets for
the mounting of a condenser Microphone Cartridge Type 4132, and a
Cathode Follower Type 2613 or the Sound Level Meter Type 2203.
4152
Fig. 1.1. The Artificial Ear Type 4152.
A spring arrangement is provided to fulfil certain Standards requirements
regarding the force applied to the object under measurement.
It
can be
adjusted to apply a force of 200 grammes to an earphone when using the
2 cm3 Coupler, as prescribed in the earlier American Standard A.S.A. Z.
3
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