FONIX® 8000 - Frye Electronics

Real-Ear Measurements 179
Be aware that extra care is necessary with any output that may exceed 132 dB
SPL. Also, keep in mind that the sound pressure level at the eardrum can be
higher than that measured at the mid-ear canal position, especially at high frequencies.
For this reason, extreme caution is advised when performing real-ear
measurements with a source level of 90 dB SPL or higher.
to change the output limit:
1. Press [MENU] to enter the real-ear measurement menu.
2. Press [, ] to select Output Limit under Measurements.
3. Use [, ] to choose the desired limit.
4. Press [EXIT] to return to the real-ear measurement screen.
8.4.14 Measuring the occlusion effect
You can use the Insertion Gain screen in order to measure the “occlusion effect”
of a hearing aid. By analyzing the spectrum of your client’s own voice, you can
judge whether the occlusion effect will make the hearing aid uncomfortable,
and you can measure an improvement (lessening) of the occlusion effect after
adjusting the vent opening.
to measure the occlusion effect:
1. Enter the Real-Ear Navigation screen by pressing [F2] from the Opening
screen.
2. Follow the instructions in Section 8.2.3 to insert the probe tube into the client’s
ear. You do not have to level the sound field speaker for this measurement.
3. Insert the hearing aid in the client’s ear, being careful not the move the
probe tube. The hearing aid can be turned on or off.
4. Enter the Insertion Gain screen by pressing [F3] from the Real-Ear
Navigation screen.
5. Use [F2] to select the REUR 1 curve. (Press [F2]. Use [, ] to select REUR
1. Press [] to complete the selection and close the pop-up menu.)
6. Use [F5] to select a source type of COMPOSITE.
7. Press [] repeatedly until the chosen source is OFF.
8. Press [START] to start the measurement.
9. Instruct your client to sustain the vowel sound “eee.”
10. Press [STOP] while the “eee” is still sounding, and the curve has stabilized.
The client can now stop vocalizing.
11. Look at the amplification in the low frequencies. If it seems high, you may
consider adjusting the vent to a more open condition, to prevent occlusioneffect
discomfort.