Frye FONIX 7000 - Manual (Page 72)

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FONIX 7000 Hearing Aid Analyzer
Figure 3.3.4D—Comparison of couplers with open-ear hearing aid. Curve 1 was measured
using the Open Ear coupler, Curve 2 with an HA-1 coupler, Curve 3 with an HA-2 coupler, and
Curve 4 is the KEMAR real-ear response.
3.3.5 Body Aids
1. Insert the coupler microphone into the HA-2 coupler. (The most consistent
results for body aids can be obtained by locating the 2-cc coupler outside
the test chamber, preferably on a foam pad to isolate it from vibration.)
2. Snap the earphone (receiver) of the body aid onto the 1/4" recessed-end of
the coupler (Figure 3.3.5A).
3. Place the aid in the test chamber with its microphone opening as close to
the reference point as possible. See Figure 3.3.5B.
4. Turn the gain (volume) control to the desired setting and set the switch for
microphone operation (not telephone coil or “T”).
5. Close the lid and test as desired. (The aid’s cord will not be damaged by
closing and latching the test chamber lid.)