Maico MI 24, Operation Manual

Page: 55 / 71

Operation Manual touchTymp MI 24 and MI 34 Version
8107420 Rev. 6 54 03/09/2018
For instance, when during the Tympanometry a 1.0 ml
ear volume is measured, the intensity of the stimuli during
the
Acoustic Reflex measurement will be reduced by
6 dB, with AGC active this results in a more accurate
reflex threshold measurement.
Table 14: AGC Active, Relative SPL Level Corrections
EAR CANAL VALUE RELATIVE SPL LEVEL
Ear Canal Value Relative SPL Level
2 ml (cc) 0 dB
1 ml (cc) -6 dB
0.5 ml (cc) -12 dB
0.2 ml (cc) -20 dB
0.1 ml (cc) -26 dB
In general, AGC is used to hold the level of the tone constant.
Especially in smaller ear canal volumes AGC provides an
accurate and safe intensity reflex stimulation. Without AGC ,
the reflex activator stimuli in these smaller ear canals would
be higher than the referenced calibration value.
5.6.10 Settings
– Acoustic Reflexes – Level
Figure 117
Figure 118
Figure 119
Figure 120
Level : Defines the test operation on which level change is used
when entering the Acoustic Reflex module. Options include:

Automatic : touchTymp starts Acoustic Reflex test at
the minimum level and increases in 5 dB steps
automatically until a reflex is registered or the
maximum level is reached (Figure 117).

You can adjust the minimum and maximum level for
Ipsi and Contra in 5 dB steps either for the level range
(if Automatic is selected) or a single level (if Fixed is
selected). Levels can be selected between:

Ipsi : min: 70 dB HL, max: 105 dB HL,

Contra : min : 70 dB HL , max : 120 dB HL (Figure 118).

Fixed: The measurement is performed at one level as
defined in the Settings (Figure 119 and Figure 120).
5.6.11 Settings
– Acoustic Reflexes – Stimulus
Figure 121
Ipsi 226 Hz, Ipsi 1000 Hz, Contra 226 Hz, Contra
1000 Hz:
Defines the default frequencies for Ipsilateral
and Contralateral measurements when the Acoustic
Reflex screen is entered for testing. Default frequencies
can be modified within the test screen and will return to
the default settings when the screen has been exited
(Figure 121).
NOTE: Stimuli for MI 24 version are frequencies
500 Hz, 1000 Hz, 2000 Hz, 4000 Hz . Stimulus options