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CHAPTER NINE
TEOAE test
78
TEOAE test
If either the OAE signal or noise level at a frequency band is greater
than 20dB SPL, an up arrow will appear above the band to the right
of the tick to show the level is off the graphical scale.
If no data has been collected, then a histogram will not be drawn and
diamond symbols will be shown instead.
Brackets can be displayed to indicate normative ranges (see
chapter
15
Configuration ).
9.2.2
Circles
The
Circles
display shows a series of small circles. Each small circle
represents the SNR recorded in a particular ½ octave frequency band
when the minimum signal level is met. If the minimum signal level is
not met, the circle will not fill completely, even if SNR criterion has been
achieved. The numbers below the circles indicate the kHz frequency of
the centre of the ½ octave band. When the test has stopped, a tick/check
mark is shown in the circles that passed.
If the test mode is set to
Wideband
or
Narrow
(see
Configuration
,
chapter
15
), only one circle is shown. A fuller circle indicates that the SNR
and signal level are closer to the pass criteria. When the test has stopped,
a tick/check mark is shown in the circle if the test has passed.