eMoyo KUDUwave - Page 90

eMKW-TD0054-21- Page 89
Analysis performed
Compliance peak level; compliance peak pressure level; ear canal volume; peak
width; tympanogram type
Reflex Measurements
Reflex test types
Ipsilateral, contralateral and bilateral (simultaneous ipsi- and contralateral)
Reflex stimuli
500 Hz, 1000 Hz, 2000 Hz, 4000 Hz and broadband noise
Frequency: ±1 %
THD: < 5 %
Broadband noise: ±5 dB from 500 Hz to 4000 Hz
Stimulus level control
Step: 5 dB
Accuracy: ±5 dB
Stimulus
Minimum [dBHL]
Maximum [dBHL]
500 Hz
50
100
1000 Hz
50
100
2000 Hz
50
100
4000 Hz
50
90
Broadband noise
50
90
Stimulus presentation control
on-off ratio: >70 dB
rise and fall times: 20 ms
residual A-weighted SPL with stimulus off: <25 dBSPL
Stimulus level variation with ear
canal volume
Since both ipsilateral and contralateral stimulus use probes the stimulus sound
pressure level in the ear canal may vary depending on the ear canal volume.
Possible variations are tabulated below relative to a 2 cm
3
cavity (in which the
stimulus is calibrated):
Stimulus frequency [Hz]
Ear canal SPL for different ear canal volumes
relative to 2 cm
3
[dB]
0.5 cm
3
1.0 cm
3
500
14
8
1000
11
6
2000
12
7
4000
12
7
Reflex sensitivity
0.01 cm
3
is the smallest displayed volume change