Explanation Of Protocol Parameters - Interacoustics Sera Additional Information

Explanation of protocol parameters

Center frequency bands lists the center frequency of the ½ octave test frequency bands.
The stimulus type defines the stimulus type used for testing. The stimulus is a bipolar non-linear click,
which is typically used in both screening and diagnostic OAE testing.
The stimulus level indicates the stimulus intensity level in dB peSPL at which the test is conducted.
The stimulus tolerance defines the range in which the presented stimulus is still acceptable. The number
(in dB) indicates the allowed difference in both a positive and negative direction from the stimulus level.
When the level tolerance exceeds the limit set, the test is paused until the stimulus goes back into the
acceptable range.
The Noise rejection level is the level in dB SPL above which recordings are considered to be too noisy. No
TEOAE data is collected during rejection.
The Maximum test time is how long the test will continue for if no TEOAE can be detected before it
automatically stops testing and displays a REFER result. The test time on Sera equals the nett time used
TM
for testing. In other words, it does not include time elapsed when measurements are being rejected. For a
test to reach a REFER, 60 seconds of good data must be collected before the test will automatically stop.
SNR is the minimum signal to noise ratio that must be reached to meet the detection criteria. The signal to
noise ratio (in dB) is the difference between the TEOAE level and the noise level.
Minimum TE level is the minimum level (in dB SPL) that an OAE must be measured at for it to meet the
detection criteria.
Min total OAE, is the minimum total OAE (in dB SPL) that must be detected before the test can meet the
stop criteria.
# bands for a pass indicates the number of center frequency bands that must be detected before the test
will stop and be labelled with a PASS result.
D-0114042-D – 2020/03
Sera™ - Additional Information Page 32