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

Real Ear Measurements 44
2.7 Measuring the magnitude of the occlusion effect.
STEP-BY-STEP
Occluded
Unoccluded
Figure 58 – Verification of the magnitude of the occlusion effect
1. Press [F2] from the Opening screen to enter the Real Ear Navigation screen.
2. Press [F2] to enter the Real Ear Insertion Gain screen.
Verify that the bottom graph ordinate is in dB SPL (“SPL” should appear in the upper left corner of
the display). If it reads “GAIN,” the display will need to be changed to SPL by following these
steps:
a. Press [MENU] from the Insertion Gain screen to open the local menu.
b. Use the up and down arrows to select Display under Display Settings.
c. Use the left and right arrows to choose SPL.
d. Press [EXIT] to return to the Insertion Gain screen.
3. Set the patient up for real ear measurements and level the sound-field speaker
as described in section 2.1.
4. Use [F2] to select REAR 1. The hearing aid is NOT yet in the ear.
5. Press the down arrow repeatedly until the source is OFF.
6. Press [START] to begin measurement. Instruct the patient to vocalize and
sustain the “ee” sound. (For greater accuracy, it is recommended that a sound
level meter (SLM) be used to maintain a vocalization at approximately 60 dB
SPL.)
7. Press [STOP] to store the response of the unoccluded ear canal.