Operation; Preliminary Check; Pretest Noise Recovery Period - Welch Allyn AM282 Directions For Use Manual

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Operation

Preliminary check

Throughout this chapter are references to front panel (F) and rear panel (R) connectors,
controls and indicators. Please refer
indicators"
descriptions and locations.
1. Prior to testing, ensure that the power cord or the batteries are in place and earphone
cords are plugged in securely.
2. Turn the audiometer on.
3. Select the desired tone type (steady, pulsed or FM).
4. Make whatever notations your procedure requires on the audiogram form.
Note

Pretest noise recovery period

Note
Two prerequisites are of particular importance to the procurement of reliable audiograms:
• Prior to testing, allow enough time for the subject to recover from the effects of noise
exposure. Exposure to high levels of sound (unmuffled lawn mowers, power tools,
loud music, gunfire, etc.) tends to create a temporary threshold shift (TTS), which
diminishes with time after exposure. If a subject is tested too soon after noise
exposure, a hearing test may indicate a hearing loss that does not reflect the subjects
true hearing. It is recommended that the testing procedure prescribe some time
interval - usually at least 16 hours – between the last exposure to high-level sound and
the administration of any hearing test.
on page 7 and "LCD display"
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.
Always clean and maintain 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. Do not allow any of the cleaning solution to enter 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.
The generic term "subject" used in this manual is used to identify the person
whose hearing is being evaluated.
to"Rear panel connectors"
on page 8 of this manual for specific
on page 5, "Controls and
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