Operation; Operation Of The Artificial Ear - BRUEL & KJAER 4152 Instructions And Applications

2.
Operation
To carry out measurements by means of the Artificial Ear Type 4152, it must
be fitted with a Microphone Cartridge T ype 4144, a Microphone Preamplifier
Type 2619 and an indicating instrument.
It
is possible to use the Sound Level
Me ter Type 2203 instead of the preamplifier and the indica ting instrument.
To make the Artificia l 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 4144, without protection grid, to
the microphone socket.
2 ems Coupler 6 ems Coupler
3. If it is desired to use an adapter
other than the standardized 18 mm
ear mould substitute, then this
should be replaced by the desired
one, see page 18.
4. Screw the Coupler onto the micro-
phone.
NBI Take great care not to damage
the diaphragm.
3a. Screw the Coupler Adapter
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 Fron t Cover DD 0015 may be screwed on to the Coupler Adapter Ring.
(See Appendix).