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Fig. 5
.
2.
Adaptor DB 0962 to enable 1
I
2" Preamplifier Type 2642
to be connected to the Artificial Ear Type 4152, which em-
ploys a one inch Microphone
NOTE: Take great care not to touch the diaphragm.
3. Replace the Coupler on the Coupler Socket.
4
.
Screw the Preamplifier Type 2642 into the socket in the body of the Artificial Ear.
When using the Type 2642 Preamplifier with the Artificial Ear Type 4152, which
has a 1" preamplifier fitting, adaptor DB 0962, see Fig.5 .2, should be used.
5. For testing normal (i.e. supra-aural) headphones: place the Adaptor Y J 0304 on top
of the Coupler. It is possible to invert or remove the Adaptor to accommodate particu-
lar headphones but if this be done it should be mentioned in the test specifications
.
For testing circumaural headphones: place the Adaptor DB 0843 on top of the Cou-
pler. The Adaptor YJ 0304 may be placed on top of this arrangement to simulate
the human pinna
.
The Adaptor
Y
J
0304 may be either upright or inverted and the
orientation chosen should be mentioned in the test specifications. The Clamping Me-
chanism cannot be used with the Adaptor DB 0843.
6
.
Place the headphone to be tested on top of the Artificial Ear
.
7.
If one wishes to apply
a
force to the headphone proceed as follows:
Supra-aural headphones: mount the Clamping Mechanism on the base of the Artifi-
cial Ear then adjust the height of mechanism until the desired force is indicated on
the engraved scale
.
Fig.
5
.
3.
Left) Adaptor DB 0843 mounted on the Artificial Ear Type 4153 (the clamping mechanism and
the Adaptor Y J 0304 have been removed)
Right) A circumaural sound attenuating cup mounted on the Artificial Ear
24
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