Noise Sources - Interacoustics OtoRead Operation Manual

however, sucking will add noise to the test and decrease the
likelihood of a passing result.
When testing a newborn, gently pull down and back on the
pinna to straighten out the ear canal. Prepare the OtoRead unit
by turning on the device, selecting the test ear and eartip. It is
very important to select the eartip and push the arrow key
which selects the test ear before placing the OtoRead probe
into the newborn's ear canal. Pushing the button after the
eartip is in the ear canal may startle the baby and will
cause a noisy test result. Gently place the probe tip into the
infant's ear canal using a cone-shaped or small (green or
yellow) mushroom-shaped eartip. The cone-shaped eartips
tend to insert deeper into the ear canal than the mushroom-
shaped eartips. Also note that the yellow and red cones tend
to startle babies and have poor retention in the ear. The best
choice is the red-flanged infant eartip (ER34-E1).
This deeper insertion into the ear canal allows for the
measurement of larger emissions due to the reduced ear
canal volume. Deeper insertion of the probe tip is desirable,
however, it may also waken the newborn and cause them to
startle. If this happens, the use of the mushroom-shaped
eartips is more desirable. The use of a mushroom-shaped
eartip is more effective in testing if the eartip enters the ear
canal, rather than just sitting flush with the ear canal opening.
Warming the eartips prior to insertion also helps to keep the
baby calm during testing.
When the noise level exceeds the noise rejection limit of the
instrument, the red ERROR light will appear. The ERROR light will
usually 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.
OtoRead Screener

Noise Sources

Operating Instructions Page 24