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Operating
Instructions Manual
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Contents
Section 1: Operation Manual Introduction………………………… 3
1.1 – Introduction…………………………………………………………………………………….
1.2 – Audience ……………………………...............................................................
1.3 - Purpose…………………………………………………………………………………………….
1.4 – Audiometer……………………………………………………………………………………..
3
3
3
Section 2: Terms…………………………………………………………………….. 4
2.1- Terms to be familiar with…………………………………………………………………..
4-5
Section 3: Care and Operations…………………………………………. 5
3.1- Care of the Audiometer……………………………………………………………………. 5
3.2- Mechanical Function Check………………………………………………………………
5-6
Section 4: LCD Screen Display……………………………………......... 7
4.1- Figure 1.1…………………………………………………………………………….. 7
4.2- Screen Indicators…………………………………………………………………. 7
Section 5: Front Panel……………………………………………………………. 8
5.1- Figure 1.2…………………………………………………………………………….. 8
5.2- Front Panel Control and Indicators………………………………………. 8-9
5.3- Typical Testing Session………………………………………………………… 9
Section 6: Instructions………………………………………………………….………
6.1- Procedure…….……………………………………………………………………………………
10
10-12
Section 7: Safety Warnings………………………………………………………….
13
Section 8: Troubleshooting…………………………………………………………
14
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Section 1 – Operation Manual Introduction
1.1 INTRODUCTION
Hearing screening with a pure tone audiometer conducted by properly
trained personnel will lead to early identification of hearing loss. The
hearing screening process can identify individuals with outer and middle
ear problems, as well as hearing loss caused by damage to the inner ear.
The screening program is intended to identify individuals in need of further
diagnosis and treatment.
1.2 AUDIENCE
This manual is intended for use of performing a hearing screening in clinical
and school based settings.
1.3 PURPOSE
The purpose of this hearing training manual is to provide the screener with
instructional information to conduct pure tone hearing screening in the
school or clinic setting. Detailed description of each procedure will be
presented in this manual. These guidelines are here to help perform a
screening.
1.4
AUDIOMETER
An audiometer is a device that produces tones at set frequencies and
known amplitudes through headphones worn by the patient. The patient is
required to indicate what tones he/she can hear. The pure tone audiometer
is the preferred instrument used in school and clinic hearing screening
programs. The audiometer has test tones ranging from 250 to 8,000 Hz (Hz
refers to frequency, or cycles per second). This is the pitch of the tones that
range from very low pitch to high pitch. The tones most often used are 500,
1,000, 2,000, and 4,000 Hz. The intensity (loudness) is signified in decibels
(dB). Thirty is considered the level of a soft whisper. Sixty-five is the
average intensity for a normal conversation, and eight-five is so loud that
individuals must be protected when working under exposure.
*Note, the audiometer that will be used in this screening is GSI 61.
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Section 2 – Terms
2.1 Terms to be Familiar With
Audiogram – A graph on which a person’s ability to hear sounds at different
frequencies are recorded.
Decibel((dB) – Expresses the intensity of a sound.
Frequency Dial: This dial rotates from 250 to 8000 Hz. It controls the test
frequency, or pitch of the tone.
Hearing Level Dial or Decibel (dB) Dial: This controls the test intensity, or
loudness of the tone. Normally this is a rotary dial, which allows you to vary the
tones presented in 5 dB steps.
Hearing Level – The amount of hearing loss indicated by audiometry and
measured in terms of decibels for any given frequency.
Hearing Loss – Varies greatly from person to person. The American Speech
Language and Hearing Association (ASHA) classify hearing loss as follows:
0-20 dB – normal
21-25 dB – slight
26-40 dB – mild
41-55 dB – moderate
56-70 dB – moderately severe
71-90 dB – severe
91+ dB – profound
Power or On/ Off Switch: This switch needs to be on when testing.
Pure Tone – A single frequency produced by an audiometer. A pure tone
contains no harmonics or overtones.
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Threshold – The softest (minimum) hearing level at which an individual is able to
respond to a tone.
Tone Presentation Bar or Stimulus Switch: Pressing this bar (or switch) presents
the tone to the person being tested.
Section 3 – Care and Operations
3.1 Care of the Audiometer
General care:
Handle gently
Earphones:
 Clean routinely with cleaning agent, alcohol free wipes. When the
earphone cushions need cleaning, remove them from the headset, clean
and dry thoroughly before replacing.
 The audiometer is in need of repair if:
1.) Tone does not sound normal or sound is not produced when tone
lever or button is pressed or static is heard.
2.) Earphones do not remain in proper position over ears
3.2 Mechanical Function Check
Before using the audiometer, plug it in for ten minutes and then proceed to the
following list.
1. Power On- Make sure there is power to the audiometer
2. Earphone Cushions- The cushions should be clean and free from breaks or
tears.
DO NOT use alcohol wipes on the cushions.
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3. Headband Tension- Put on the earphones. There should be enough tension
so that when positioned on the head, the earphones rest snugly on the
ears.
4. Tone ON/OFF – Turn the switch to on position and the sound should be on.
The sound should be off in (REV) position.
5. Volume Increase/Decrease- Turn the hearing level dial and listen for
loudness changes.
6. Pitch Change- Change the frequency dial and listen for changes in pitch.
7. Tone Presenter Switch(es)- Press the switch, and the sound should go off
when the switch is initiated.
8. Static- No static should be heard.
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Section 4– Screen Display
4.1 Figure 1-2
G1
G2
G3
G4
G5
Section 4.2- Screen Display Indicators
G1- Indicates the frequency desired
G2- Indicates the hearing level (dB)
G3- Indicates that you have changed the stimulus to tone
G4- Shows you have changed the transducer to phone
G5- Routing will tell you which ear you are testing
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Section 5 – Front Panel
5.1 Figure 1-1
F1
11
F7
F2
F3
F4
F5
F6
5.2 The Front Panel Controls and Indicators
(Figure 1-1)
F1-This control allows the operator to choose the type of tone presented to the
test subject. It can be set on steady, pulsed (press the button 3 times) or FM,
which is one steady tone.
F2-This button indicates you want to deliver pulsed tones.
F3- Indicates a knob for setting the stimulus intensity level. Level is indicated on
the center top of the display.
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F4- Present this bar for stimulus presentation. The symbol appears on the left side
of the display when the stimulus is being presented.
F5-Allows you to talk to the patients using a headphone set.
F6-changes the frequency desired
F7-This will present a pulse tone.
5.3- Typical Testing Session
5.3.1 Pre-Test Review
a. Turn the instrument on.
b. Check that the earphones are operating properly.
c. Seat subject comfortably in the test area.
d. Explain the test procedure.
e. Assist subject with the earphones.
f. Select the desired type.
g. Begin the procedure
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Section 6: Procedures
6.1.1 Instructions Your instructions should be clear and brief, letting the client know
what to expect and how to respond.
 The client needs to understand: They are listening for very soft
sounds, they have to respond every time they hear the sound, how
to let you know they have heard the sound.
 One way of instructing the client is to say something like: “You will be
hearing a series of beeps, first in the right ear and then in the left. As
soon as you hear the sound, no matter how soft it is, let me know by
pressing the button.
 Like this (indicate how to press the button).
6.1.2 Placing the Earphones The earphones must be put on carefully.
 Place the diaphragm of the earphones directly over the opening of
the ear canal and the band sits across the top of the head.
 If the earphones are not placed directly over the opening of the ear
canal, hearing thresholds could appear worse than they are.
6.1.3 What Ear Always ask for better ear.
 If the client is unaware always test the right ear first.
6.1.4 Client Is Ready Once your client is all set and doesn’t have any further questions,
start the testing.
6.1.4.1
Return to the control room and put the headset/microphone on.
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6.1.5 Get Equipment Ready Using Channel 1, set transducer to phone, stimulus to tone, and
routing to right ear.
 To the left of Channel 1, you will push pulse in order to use a pulsed
tone.
 Using the talk forward button, inform the person you are about to
begin.
6.1.6 Start Threshold Testing –
 Using the banana shaped presentation button under channel 1,
present a pulsed tone (3-5 beeps) to the right ear at 30 DB AT 1000
Hz.
 Set the routing selector to route the test tone to the selected ear.
Demonstrate the 1000 Hz.
 Tone at a 30 dB level. Duration of tone should be between one and
two seconds (push the button three times).
 Set HL control to -10 dB, gradually increase the intensity by turning
the hl control until a response occurs.
 Switch the tone off for at least two seconds and present the tone
again at the same level.
 If there is a second positive response, proceed to threshold
measurement.
 If a second response does not occur, repeat this step.
NOTE: LOOK AT FIGURE 1-3 FOR WHICH FREQUENCIES TO BE TESTED ON THE
NEXT PAGE
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Figure 1-3
Frequency Testing:
Right ear
Left ear
1.
1000Hz
8.
1000Hz
2.
2000Hz
9.
2000Hz
3.
4000Hz
10.
4000Hz
4.
8000Hz
11.
8000Hz
5.
1000Hz
12.
1000Hz
6.
500Hz
13.
500Hz
7.
250HZ
14.
250HZ
6.1.7 Threshold Determination The level of the first presentation shall be 10 dB below the level at
which the subject responded.
 The tone for a period of one or two seconds. Time between tones
can be varied, but not shorter than the duration of the test tone
itself.
 After each failure to respond to a signal, the level is increased by 5 dB
until the first response occurs.
 After the response, the intensity is decreased 10 dB and another
series begins.
NOTE
Descend in 10 dB steps and ascend in 5 dB steps.
*The threshold is considered to be the minimum dial setting at which a
response has occurred two out of three times
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6.1.8 Testing Procedures Repeat steps (6.1.5 and 6.1.6) for each tone- setting in the following
order: 1000, 2000, 3000, 4000, and 8000 Hz.
 Retest 1000 followed by 500 and 250. If there is a difference of 20
dB or more between two octaves, test the inter-octave responses at
750, 1500, 3000 Hz.
6.1.9 Repeat steps (6.1.5, 6.1.6, and 6.1.7) for the left ear.
Section 7: Safety Warnings
1. Do not turn on/ off system while a patient is wearing the headsets or
internal earphones.
2. Use only the provided power supply.
3. To ensure patient safety and optimal performance, use only GS1 61
recommended accessories and supplies.
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Section 8: Troubleshooting
If the audiometer is no longer working properly, please check the following
points:
LCD screen does not light up
No sound from headphone
Is the power switch on?
Is the power cord plugged in correctly in
the power connector?
Is the wall outlet working?
Is the headphone cable plugged correctly
in socket?
Is the head phone defective
If your instrument still does not work properly after this short check, please
consult the company’s service center.
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