Otoport OAE+ABR
User Manual for Otoport DP+TE model
77
TEOAE test
9.2
TEOAE test screen
During testing the Otoport plays a series of clicks into the ear and records
the response. The OAE signal is very small and difficult to distinguish from
the noise made by other sounds in the room and by the patient. The longer
the Otoport records for, the easier it is to distinguish the OAE signal from
the noise. The Otoport looks at the ratio of the OAE signal to the noise;
this is known as the Signal to Noise Ratio or SNR. The Otoport measures
the SNR in a number of different frequency bands. The pass criteria are
set in the
Configuration
area (see chapter
15
Configuration
). The default
pass criteria are an SNR of 6dB and a minimum signal of >-5dBSPL in at
least two frequency bands.
It is the responsibility of the user to ensure that the pass criteria set meet
their requirements.
The test screen display depends upon the display option set from the
Configuration
menu (see chapter
15
Configuration
). The default display
is
Bars
.
9.2.1
Bars
The screen displays test data graphically on the screen in ½ octave bands:
1k, 1.5k, 2k, 3k and 4kHz. The clear section of each band represents the
OAE signal level within each band and the shaded section represents the
noise level at that frequency.
A tick/checkmark will appear above a bar if the band has met its pass
criteria. Please refer to
Configuration
(chapter
13
) for further information
on the band Stop criteria.
If either the OAE signal or noise level in a ½ octave band is greater than
20dB SPL, an up arrow will appear above the bar to show the level is off
the graphical scale.