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Audiometry Testing (Version 3 and Version 4)
Prior to testing, ensure that the earphone cords are plugged into the appropriate connectors on the rear
panel of the instrument. Both Headphones and Insert phones are available. Select the appropriate
transducer and the desired tone type (i.e., pulsed, steady, or FM).
CAUTION
Always handle earphones with care. Neither drop them nor permit them to be
squeezed together. Severe mechanical shock may change their operating
characteristics and require their replacement. Insert the earphone cords between the
earphone cushions during storage to prevent damage from mechanical shock.
INSTRUCTING THE PATIENT
Put the patient/subject as much at ease as possible before the test begins. In addition, it is important
to try to make them understand how the test is to be conducted and what they will hear. For sake of
uniformity, an unvarying explanation is advisable, for example:
“I am going to place these earphones over your ears. You will hear tones or beeping sounds
which may be loud or soft. Whenever you hear, or think you hear one of these tones, raise your
hand. Lower your hand when you no longer hear the sound. Remember, raise your hand when
you hear the tone and lower your hand when you do not.”
NOTE:
Modify the instructions accordingly if Insert phones are being used or if indicating the sound
is heard using the available handswitch.
WARNING
Any program aimed at obtaining reliable records of hearing thresholds should be
staffed and supervised by appropriately-trained individuals. Training courses leading to
certification are available for audiometric technicians in most urban areas.
PLACEMENT OF EARPHONES
The most important thing to remember is that a good seal is required between the earphone cushion
and the subject’s/patient’s head and ears. To increas
e the likelihood of a good seal,
a.
Eliminate all obstruction between the earphones and the ears (e.g., hair, eyeglasses,
earrings, hearing aids, etc.).
b.
Adjust the headband so that it rests solidly on the crown of the subject’s head and exerts
firm pressure on both ears.
c.
Center the earphones carefully over both ears. The earphone with the red connector goes
on the right ear. Take care to eliminate any visible gaps between the earphone cushions
and portions of the individual’s head and the ear on which the cushion rests.