Interacoustics AT235 Impedance Audiometer Gebrauchsanweisung Seite 6

AT235 Instruction for Use - English
Date: 2001-06-15
1. Switch on the instrument
Make sure that the power supply is connected correctly to the mains and to the instrument. Now
switch on the instrument on the connection panel of the instrument by pressing the power switch (33).
2. Clear memory of instrument
Before making a test on a new patient it is always recommended to clear the internal memory of the
instrument by holding down "shift" (17) while pressing "new subject" (9).
3. The right eartip
Check the size of the patient's ear canal in order to find an appropriate size eartip (6 to 22 mm) and
mount it onto the probe tip. It is recommended always to use the eartips supplied by Interacoustics.
4. Select ear
Now select the correct ear by pressing "Right" or "Left" (20 or 21) or by pressing the remote switch on
the probe.
5. Testing the first ear
Take the probe with one hand and insert the probe tip with the eartip mounted into the patient's ear
canal while, with the other hand, carefully pulling backwards / upwards the pinna to straighten out the
ear canal during the insertion.
The probe will have an air tight fit when the indication light on the probe is green. When the status
"Leaking" or "Blocked" is displayed in the upper right hand corner of the screen under the Status Bar,
the indication light on the probe will be yellow. This indicates a bad fitting or a blocked ear tip.
When a correct fit has been obtained a tympanometric test is automatically performed on the first ear.
By means of the tympanometric test AT235 establishes the correct pressure in the ear canal for the
subsequent reflex test.
6. Testing the next ear
Now select the next ear by pressing "Right" or "Left" (20 or 21) or by pressing the remote switch on the
probe. The test procedure is carried out as in the above section 5.
7. Print out test result
To print out the test result from the internal printer press "Print" (8).
Useful Information
• Before starting a test session with tympanometry and reflexes it is possible to select between two
pre-programmed reflex setups, namely Test A and Test B. By pressing F6 it is possible to modify
the selected Reflex Test A or B, but for the following patient only.
Changing the pre-programmed Reflex Test A or B must be done from the Setup, which is reached
by pressing F2 while being in the Main Menu.
• Tympanometry and Reflexometry can be performed either on their own or automatically with
Reflexometry following a Tympanometry Test. The "Tymp/Reflex" key (10) has two indication lights
which indicate whether Tympanometry and Reflexometry is performed on their own or together.
• After an automatic reflex session it is possible to perform manual reflexes simply by pressing "Man"
(13). Now, by means of "Frequency Decr/Incr" (14, 15) and "Intensity Decr/Incr" (23, 24), it is
possible to alter the reflex parameters. To present the stimuli for the reflex press "Tone Switch"
(22). To store the manual reflex press "Store" (16).
Operation Instruction
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