Operating Procedures; Environmental Performance Conditions; Method For Determining Hearing Thresholds - Electronica Technologies 9910 Bedienungsanleitung

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5. Operating procedures

The operator has to be an health contributor who knows the basics necessary to operate
and to interpret the test results.
Otherwise, it is preferable to contact the Distributor of the audiometer or a training center
in view to go thoroughly into the knowledge of audiometry.
It is advisable to check that the device shows no signs of impacts or any other damages
liable to cause malfunctions.
5.1.

Environmental performance conditions

To give optimal performance, the patient must be seated in a very room where there is
very little environmental noise (i.e. below 20 dB).
The headset shall be adjusted to fit the patients head as flushly as possible. Make sure the
headset is fitted with the left (L) and right (R) earphones correctly placed.
Patients who wear glasses should remove them for the test.
5.2.

Method for determining hearing thresholds

Only the operator shall be able to use the audiometer controls.
He must start by explaining how the patient is to reply, i.e. by raising the hand on the side
they can hear through, or by pressing the pushbutton on the feedback lead, accessory as an
option, (run a preliminary test using the pushbutton to check it is working properly).
Optimal threshold determination hinges on the patient first being familiar with the
audiometer tone.
Procedure:
 Deliver a 40 dB tone (starting at 1000 Hz)
 Decrease the tone in steps until the patient can no longer hear the tone, and read-off
this value.
 If 40 dB is too low for a start point, increase the tone in 10 dB steps until the patient
can hear the tone.
 Drop the sound level back down to find the familiarization threshold, and read-off
this value.
Determination of the hearing threshold:
 Deliver a tone that is 10 dB below the level identified during the familiarization
step. If the patient cannot hear the tone, increase in 5 dB steps until the patient
picks up the sound.
 Repeat this sequence several times (2 or 3 times) to pinpoint the patient's hearing
threshold.
Audiometer 9910
Rev. January 2017
Version EN1_H
Series 9000 AUDIOMETERS
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