FONIX® 8000 - Frye Electronics

58 FONIX 8000 Hearing Aid Test System
5. Complete the acoustical sealing of
the aid to the coupler by using a
pencil or finger. You may want to
double-check the aid placement
through the open end of the coupler
at this point. Slowly reinsert the
coupler microphone into its access
opening.
6. Place the completed assembly
at the reference position in the
test chamber. With ITEs, the
position of the aid can affect the
frequency response. As a rule,
point the faceplate of the aid
toward the speaker in the back
of the chamber, with the microphone
opening in the reference
circle.
3.3.2 HA-2 Coupler
If you are using a battery pill, be sure the metal conductor strip does not
obstruct the sound path.
The HA-2 coupler approximates the human ear with an earmold attached. See
Figure 3.3.2A. Note the tube that simulates the earmold. Button-type receivers
connect directly to this coupler. Behind-the-Ear (BTE) hearing aids connect to
this coupler by means of an ear-level adapter.
OUTER O-RING
INNER O-RING
MICROPHONE
O-RING
Figure 3.3.2A—Standard 2-cc Coupler (HA-2)