Frye FONIX FA10 User manual

Using the FONIX FA10 Audiometer
for the TEN(HL) Test
Diagnosis of dead regions in the cochlea

-1-
Calibration
1. Set the Input dials on the left and right sides of the audiometer
to External, and the Output dials on the left and right sides of
the audiometer to Phone. See Figure 1.
Stimulus Stimulus
Input
Output
Bone Speaker
Left
Channel
Phone
Tone
Narrow
Band
Noise
White
Noise
Speech
Noise
Stenger
Left
External
External
Mic
Output
Bone Speaker
Right
Channel
Phone
Tone
Reverse -2.5 dB -2.5 dB Reverse
dB




Hz 


dB




Input
Narrow
Band
Noise
White
Noise
Speech
Noise
Stenger
Right
External
External
Mic
Figure 1: Setup for calibration of the TEN(HL) CD.
Using the FONIX FA10 Audiometer for the TEN(HL) Test
Diagnosis of dead regions in the cochlea

-2-
3. Press the Reverse button for both audiometer channels in
order to play the CD track continuously.
4. Play Track 1 on the CD player and adjust the left and right
External knobs so that the VU meters read 0 for both channels.
Performing the TEN (HL) Test
1. Set the Input dials on the left and right sides of the audiometer
to External.
2. Mix both channels of the CD player to the ear you want to test:
a. To test the right ear, set the Output knob on the right side
of the audiometer to Phone and the Output knob on the left
side of the audiometer to Right Channel. See Figure 2.

-3-
Stimulus Stimulus
Input
Output
Bone Speaker
Left
Channel
Phone
Tone
Narrow
Band
Noise
White
Noise
Speech
Noise
Stenger
Left
External
External
Mic
Output
Bone Speaker
Right
Channel
Phone
Tone
Reverse -2.5 dB -2.5 dB Reverse
dB




Hz 


dB




Input
Narrow
Band
Noise
White
Noise
Speech
Noise
Stenger
Right
External
External
Mic
Figure 2: Setup for testing the right ear.
b. To test the left ear, set the Output knob on the left side of
the audiometer to Phone and the Output knob on the right
side of the audiometer to Left Channel. See Figure 3.
Stimulus Stimulus
Input
Output
Bone Speaker
Left
Channel
Phone
Tone
Narrow
Band
Noise
White
Noise
Speech
Noise
Stenger
Left
External
External
Mic
Output
Bone Speaker
Right
Channel
Phone
Tone
Reverse -2.5 dB -2.5 dB Reverse
dB




Hz 


dB




Input
Narrow
Band
Noise
White
Noise
Speech
Noise
Stenger
Right
External
External
Mic
Figure 3: Setup for testing the left ear.

-4-
3. Play Track 2 on the CD player. This track contains a puretone
at 500 Hz. Use it to obtain the patient’s threshold value at that
frequency by using the Right Hearing Level knob to adjust the
signal level and the Right Stimulus button to present the tone.
Use the -2.5 dB button for best accuracy.
4. Continue with the audiometric testing, obtaining the patient’s
puretone threshold at each frequency. When complete, switch
to the other ear and repeat the process. See Step 2 for instruc-
tions on how to present the signals for the other ear. Please
note that the same controls are used for performing the test
on both the left and right ears: the Right Hearing Level knob
controls the tone level. The output knobs control whether the
signal goes to the left or right ear.
- Track 3: 750 Hz
- Track 4: 1000 Hz
- Track 5: 1500 Hz

-5-
- Track 6: 2000 Hz
- Track 7: 3000 Hz
- Track 8: 4000 Hz
5. Add the noise signal to the puretone signal (both signals will
be presented to the test ear simultaneously) by setting the de-
sired noise level using the Left Hearing Level knob and push-
ing the Left Reverse button to turn the noise on continuously.
See Step 2 for instructions on how to set the output knobs
to choose which ear to test. The noise level should be 10 dB
above the puretone audiometric threshold for each frequency.
For example, if the threshold at 500 Hz is 50 dB, set the noise
level to 60 dB.
6. Measure the masked threshold for each ear at each frequency
while playing the noise signal continually. Adjust the noise
signal to be 10 dB above the puretone threshold value for each

-6-
frequency. Use the -2.5 dB button for best accuracy. The Right
Hearing Level knob controls the puretone level and the Left
Hearing Level knob controls the noise level.
7. Compare the masked threshold to the puretone threshold and
the noise level. If the masked threshold is 10 dB above both
the puretone threshold and the noise level for a particular fre-
quency, then there is probably a dead region in the ear at that
frequency.
Examples:
- If for a particular frequency, the puretone threshold is 40
dB, the noise level used for the test was set to 50 dB, and
the masked threshold is 60 dB, there is a dead region at that
frequency.

-7-
- If for a particular frequency, the puretone threshold is 50,
the noise level used for the test was set to 60 dB, and the
masked threshold is 65 dB, there is not a dead region at that
frequency.
8. Re-test the puretone threshold at any frequency that has been
determined to be a dead region. Use the -2.5 dB button for best
accuracy. Double-check that the masked threshold is 10 dB or
more above the puretone threshold.