Noise Sources; Turning Off The Instrument - Maico ERO-SCAN Operating Instructions Manual

Operating Instruction
ERO•SCAN
Screening and Diagnostic Version
When testing an infant with the ERO•SCAN
quiet and calm; it is usually preferred for the infant to be asleep. A pacifier may be used to
calm the infant, however, sucking will add noise to the test and decrease the likelihood of a
passing result. Pull gently down and back on the pinna to straighten out the ear canal.
Gently place the probe tube into the infant's ear canal.
When testing children and adults, pull gently up and back on the outer ear during insertion
to straighten the ear canal and ensure proper placement.

10.10 Noise Sources

When the noise level exceeds the noise rejection limit of the instrument, the orange 'NOISE'
light will appear. It is common for the 'NOISE' light (See Figure 1, page 12) to appear while
testing. The light will appear infrequently if the noise level in the ear canal is low, and it will
appear more often if the noise level in the ear canal is high. Otoacoustic emissions are very
low-level sounds. Any noise in the ear canal at the time of testing can mask this emission.
This noise can come from a variety of sources.
The largest source of noise can come from the patient. This is biological noise, such as
movement, coughing, sucking, talking, etc. The patient must be calm and not move or talk.
Ambient noise in the testing environment can also be a large source of noise during the
test. A properly sealed eartip can block a large amount of this noise, but performing the
testing in a relatively quiet environment is recommended.

10.11 Turning Off the Instrument

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The ERO•SCAN instrument has an automatic "shutdown" feature, designed to prolong
battery life. The unit will automatically shut down after 1 minute (default) of inactivity. To
turn it back on, simply press the large DOWN key. This feature can be re-programmed for
various periods of inactivity before "shutdown". (See the
Auto Shutdown Time
NOTE: The UP arrow can be used to manually power off the instrument.
operating_instructions_8106556-6_EROSCAN_e_15a
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on page 39.)
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instrument, the infant has to be relatively
Changing Instrument Settings –
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