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Idiomas disponibles
Idiomas disponibles
SIBELSOUND
BONE CONDUCTION TONE TEST
The bone vibrator must be handled with care because small hits may damage it.
In this type of test, the tone is applied though a bone vibrator. It is very important to position the vibrator correctly so that the
results are reliable. The vibrator is placed on the mastoid bone; the tone applied will be a few decibels above the hearing threshold,
instruct the patient to move it along the mastoid bone until they find the point where they hear it the most. Make sure that the
vibrator is perfectly attached to the mastoid bone, and that it does not touch the auricle, to prevent cartilaginous conduction.
The bone-conduction tonal test is performed exactly in the same way as the air-conduction one, except for the following:
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The bone vibrator must be placed on the patient's mastoid bone, on the first ear to be examined (do not use the headphones).
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On the main screen, select the bone conduction mode (
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The bone-conduction examination does not allow 125 and 8000 Hz frequencies.
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Before examining the second ear, select it on the main screen and change the position of the patient's bone vibrator.
AIR-CONDUCTION TONAL TEST WITH MASKING
This type of test is performed to prevent the patient from hearing the test tone through the ear opposite to the one being examined;
narrow-band noise is applied on that ear. It is recommended to follow the steps below to set the hearing threshold with masking:
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On the main screen, select the air conduction with masking mode (
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Select the ear to be examined and set the intensity to a level equal to the hearing threshold without masking.
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Press
on the main screen. The dB value indicated in this icon will flash.
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Turn the Intensity Setting (B) to set the initial masking level to the hearing threshold value of the masked ear.
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Press
again or press the Intensity Setting (B) to save the masking level (the value no longer flashes)
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Press the Signal Application button (D) to apply the tone. The tone will be applied on the ear to be examined, and the masking
noise to the other one.
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Increase the masking level until the tone is inaudible, or until it exceeds the tone level applied on the ear to be examined.
•
If the tone is still audible when the masking level is at the tone level, this will be the hearing threshold. Press the Intensity
Setting (B) to store it. The intensity and frequency values will be displayed in green for 1 second.
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If the tone is masked, increase its level until it is audible again.
•
Increase the masking level by 5 dB. If the tone is inaudible, increase its level until it is audible again.
•
Repeat this process until the tone remains audible, even if the masking level has been increased more than 10 dB. This will be
the threshold of hearing. Press the Intensity Setting (B) to store it.
520-800-MUM · Rev 1.01
DUO
· User's manual
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EN 19
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