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Section 3 — Operation
Throughout this section there are references to front panel (F) and rear
panel (R) connectors, controls and indicators. Please refer to Section 1.3
and Figure 1-1 for specific descriptions and locations.
3.1 PRELIMINARY CHECK
Prior to testing, ensure that the power cord and earphone cords are
plugged in (R1 and R2 respectively). Turn the audiometer on, select the
desired tone type (F9—pulsed, steady or FM) and make whatever nota-
tions your procedure requires on the audiogram form.
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.
IMPORTANT
Always clean and maintain your earphone cushions, for hygiene purposes.
Check periodically for cracking or signs of wear. Cleanse cushions daily or
after each use (depending upon population being tested). Use a solution of
diluted alcohol or mild soap and water, taking care not to get any of the
cleaning solution into the earphone speaker. Use earphones only when
completely dry. Insert the earphone cords between the earphone cushions
during storage to prevent damage from mechanical shock.
3.2 INSTRUCTING THE SUBJECT
The operator should put the subject as much at ease as possible
before the test begins. In addition, he/she should try to make the
subject understand how the test is to be conducted and what the
subject will hear. For the sake of uniformity, an unvarying explanation
is advisable—something close to the following:
"I am going to place these earphones over your ears. You
will hear a variety of tones—some high, some low, some
loud, some very soft. Whenever you hear, or think you hear
one of those sounds, raise your hand. Lower your hand
when you no longer hear the sound.
"Remember that though some of the tones will be easy to
hear, others will be very faint. Therefore, you should listen
very carefully and raise your hand whenever you think you
hear the tone."
Modify the instructions accordingly if the optional response
handswitch is to be used.
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