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2.
Operation
To carry out measurements by means of the Artificial Ear Type 4152, it must
be fitted with a Microphone Cartridge Type 4132, a Cathode Follower Type
2613 (or 2612), and an indicating instrument, but however, it is possible to
use the Sound Level Meter Type 2203 instead of the cathode follower and
the indicating instrument.
To make the Artificial Ear ready for use, proceed as follows:
Operation of the Artificial Ear.
1.
Unscrew the coupler and if mounted, the Coupler Adaptor Ring.
2. Screw the Microphone Cartridge Type 4132, without protection grid, to
the microphone socket.
2
cm3 Coupler
6 cm3 Coupler
3. If it is desired to use an adaptor
other than the standardized 18 mm
ear mould
~ubstitute,
then this
should be replaced by the desired
one, see page 18.
4. Screw the Coupler onto the micro
-
phone.
NB I Take great care not to damage
the diaphragm.
3a. Screw
the
Coupler
Adaptor
Ring onto the microphone.*)
4a. Screw the Coupler to the
Coupler Socket.
5. Mount the earphone to be tested on the top of the Artificial Ear.
6. If
the spring arrangement is used, adjust the height of this arrangement
until the correct force to the earphone can be read on the scale.
Now the Artificial Ear is ready for use, and the indicating instrument and
signal to the earphone must be connected.
*) If
desired, the Front Cover DD 0015 may be screwed onto the Coupler Adaptor Ring
.
.
(See Appendix).
10
•
•
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