D-0116684-B – 2020/03
OtoRead™ - Instructions for Use - US Page 46
After setting the L1 stimulus level, press the NEXT key to go to
Level L2.
3.18.9.4
Setting the averaging time
The Averaging Time refers to the test time per DP frequency. The
Averaging Time will have a large impact on the time required to perform
the test and on the signal-to-noise ratio (SNR). A 2 second average for 6
frequencies would produce a test in about 18 seconds.
The possible settings for the Averaging Time are:
0.5 sec., 1.0 sec., 2.0 sec., or 4.0 sec.
Use the CHANGE keys to select an option and the NEXT key to go
to the next test parameter.
Longer averaging times help to reduce the noise floor which can improve
the likelihood of obtaining a pass result, particularly with a noisy patient
(e.g., a baby sucking a pacifier) or in a noisy environment. However,
shorter averaging times may be preferred for young children and/or
uncooperative patients. A minimum avering time of 2 seconds is
3.18.9.5
Setting the PASS SNR level
In order to provide a PASS/REFER determination for each test, the
PASS SNR for all DP test frequency must be set. This number refers
to the number of decibels that the DPOAE signal must be above the
noise to be considered as present (detected) at each frequency. The
PASS SNR can set between 3 - 10 dB.
A checkmark will appear above the test frequency in cases where the
SNR and minimum value criteria are met.
Use the CHANGE keys to increase or decrease the value. This
criterion is used in combination with the number of frequencies
required for a pass (discussed below) to determine an overall
PASS/REFER for each test.
After setting the desired PASS SNR, press the NEXT key to go to
the next test parameter.
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