Using the FONIX 7000 to Verify Coupler and Real-Ear Performance ...

Change
“Display” to
Gain
Coupler Measurements 21
1.6.1 Verifying the overall noise suppression feature of a hearing aid using a
composite versus a digital speech signal.
STEP-BY-STEP
Continuous
Figure 25 – Noise reduction verification – DigiSpeech vs Composite
1. Verify that the noise suppression feature is enabled on the hearing aid.
2. Level the sound chamber (press [LEVEL]).
3. Attach the hearing aid to the appropriate coupler and position the microphone at
the reference point (with the hearing aid facing the right side of the test
chamber). Close and lock the chamber lid.
4. Enter the Coupler screen by pressing [F1] in the Opening screen.
Figure 26 – Coupler menu options
Modulated
Verify that the coupler graph ordinate is in dB
GAIN (“GAIN” should appear in the upper left
corner of the display). If it reads “SPL,” the
display will need to be changed to GAIN by
following these steps:
a. Press [MENU] from the Coupler
screen to open the Coupler menu.
b. Use the up and down arrows to select
Display under Display Settings.
c. Use the left and right arrows to
choose GAIN.
d. Press [EXIT].