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1.
Description
General.
The Artificial Ear Type 4152 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 4144,
and a
Micro-
phone Preamplifier Type 2619
or
the
Sound
Level Meter Type 2203.
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 cm s Coupler, as prescribed in
the
earlier American
Standard ANSI Z.
3
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