FONIX® 8000 - Frye Electronics

170 FONIX 8000 Hearing Aid Analyzer
to auto-adjust the unaided response:
When using the SPL display in the Insertion Gain screen, or when measuring
in the Real-ear SPL screen (in other words, when the unaided response is displayed
in terms of SPL and not gain), the unaided response includes the input
signal used in the measurement.
In order to directly compare the unaided response to the aided response in an
SPL graph, it is important that the speech weighting and input level of the input
signal are the same for both the unaided and the aided response. For example,
if the unaided response is measured at 65 dB SPL, it is difficult to directly compare
it to the measured aided response at 80 dB SPL when viewing the data in
an SPL graph. However, a direct comparison of the unaided and aided response
can be desirable in ensuring the hearing aid amplifies above the unaided
response. Therefore, the 8000 Hearing Aid Test System has an “REUR Auto
Adjust” feature.
When the REUR Auto Adjust is enabled, the unaided response is automatically
adjusted according to the speech weighting and input level of the selected aided
measurement. This allows the clinician to measure the unaided response at one
level and directly compare it to aided measurement curves measured at another
level.
To enable the REUR Auto Adjust, press [MENU] in the Real-ear Insertion Gain
or Real-ear SPL screen to open the local menu. Use the arrow keys to select
REUR Auto Adjust under Measurements and change its setting to On.
The REUR Auto Adjust is automatically enabled when Unaided is set to Average
in the local menu.
8.4.4 Measuring the Aided Gain in the Insertion Gain Screen
Up to four different aided curves can be measured and displayed together in the
Real-ear Insertion Gain and Real-ear SPL screens. Any measurement made in
one of these screens will automatically be displayed in the other screen.
to measure the aided response:
1. Position the patient in front of the sound field speaker and place the earhook
and reference microphone on the ear. See Sections 8.2.1 and 8.2.2.
2. Insert the probe tube into the patient’s ear canal. See Section 8.2.3.
3. Input the patient’s audiogram to generate a target, if desired. See Section
8.3.
4. Press [EXIT] in the Audiogram Entry screen to return to the Real-ear
Navigation screen.
5. Enter the Insertion Gain screen by using [F3] in the Real-ear Navigation
screen.