Frye FONIX 7000 - Manual (Page 160)

152
FONIX 7000 Hearing Aid Analyzer
1. Enter the Real-ear Insertion Gain or Real-ear SPL screen.
2. Press [MENU] to enter the local menu.
3. Select Static Tone under Source using [∨, ∧]. Pressing [START] will jump
ahead to the beginning of the next section in the local menu.
4. Choose Single or Avg using [<, >]. If choosing Avg for a three-frequency
average, use the Avg Freqs setting to select the highest frequency of the three
frequency average. See Section 2.3.1.1 for more details on the available fre-
quencies.
5. Press [EXIT] to return to the measurement screen.
6. Press [START] to start the test. If performing a SINGLE test, use [<, >] to
adjust the frequency of the tone.
7. Use [∨, ∧] to adjust the amplitude of the test signal.
8. Press [STOP] when the measurement is complete.
6.4.8 Using the reference microphone
When determining the gain of a hearing aid, the analyzer normally subtracts the
response measured by the probe tube from the sound field measured by the ref-
erence microphone positioned outside the ear. This occurs when the reference
microphone is ON. If you are in a particularly noisy environment or if you are
testing an open fit hearing aid, the reference microphone measurement could
introduce unwanted artifacts into your testing.
When the reference microphone is disabled, the analyzer uses the information
determined during the leveling process to determine the signal outside the ear
during the measurement. It is very important that the patient remain still after
leveling and that the sound field is undisturbed, particularly if the reference
microphone has been disabled.
To enable/disable the reference microphone:
1. Enter the Real-ear Insertion Gain or Real-ear SPL screen.
2. Press [MENU] to enter the local menu.
3. Select Reference Mic using [∨, ∧] under Measurements.
4. Use [<, >] to choose ON or OFF.
5. Press [EXIT] to return to the measurement screen.
6.4.9 Viewing numerical curve data
The frequency response curves measured by the 7000 test system can be viewed
in either the standard graphical format or in data format, allowing the clinician
to take a look at the actual numerical values of the measurements.