Interacoustics AA222 Additional Information page 28

AA222 Additional Information
4.2.2.2 Reflex settings
Select the reflex test in your Protocol settings. By rotating the wheel, you can select and change the following
settings. Note that this example shows all currently available reflex stimuli.
A Auto run. When enabled, the test will run automatically as part of the protocol.
B Level increase. This defines the incremental level of each step during the threshold measurement
You can choose incremental levels from 1 dB to 20 dB.
C Choose either Fixed number of reflexes or Auto stop. When selecting Fixed number of reflexes,
the reflex test will complete the sequence from Start level up to Stop level, also if the threshold
criterion is attained before reaching Stop level. When Auto stop is chosen, the AA222 will detect the
reflex threshold depending on the threshold criterion, and confirm the reflex at the same intensity.
The sequence then stops. The stimulus level will never exceed the intensity level which is set at Stop
level.
D Threshold criteria let you set the sensitivity of the pass criteria. Three options are available:
• Very sensitive (0.02 ml) where a 'pass' is given for a change in compliance larger than 0.02 ml (at
all probe tone frequencies).
• Sensitive (0.03 ml) a 'pass' is given for a change in compliance larger than 0.03 ml (at all probe
tone frequencies).
• Normal (0.05 ml) where a 'pass' is given for a change in compliance larger than 0.05 ml (at all
probe tone frequencies).
• Robust (0.08 ml) where a 'pass' is given for a change in compliance larger than 0.08 ml (at all
probe tone frequencies).
E Reflex Stimulus: The reflex stimulus can be set to continuous or pulsed. With the ability to set the
probe tone to pulsed it is possible to obtain a reflex at 1000 Hz ipsi.
F Probe tone frequency. The frequencies which can be selected are 226 Hz (recommended for normal
testing), 678 Hz, 800 Hz and 1000 Hz.
Page 24