Operation Manual touchTymp MI 24 and MI 34 Version
8107420 Rev. 6
61
03/09/2018
TYMPANOMETRY
Test signals:
Pure tone: 226 Hz, 1000 Hz each with ± 1 %
Additional for MI 34: 678 Hz, 800 Hz each with 1 %
Test level:
85 dB SPL ±1.5 dB SPL measured in an IEC 60318-5
acoustic coupler according to IEC 60645-5:2004 / ANSI S3.39:1987.
The level is constant for all volumes in the measurement range.
Distortion:
Max 1 % THD
4
Control
Tympanometry:
Automatic
Air pressure:
Control:
Automatic
Indicator:
Measured value shown in the display.
Range:
-600 daPa to +400 daPa
Pressure
limitation:
-800 daPa and +600 daPa
Pressure
change rate:
Speed at compliance peak (change in settings):
Automatic
(Dynamic from 600 daPa/s for low
gradient and 200 daPa/s for a gradient larger
than 5 daPa)
Minimum
(50 daPa/s): slow, very precise results
Medium
(250 daPa/s): compromise of speed
and precision
Maximum
(>400 daPa/s): fast, screening
Compliance range:
0.1 ml to 8.0 ml at 226 Hz probe tone;
0.1 mmho to 15.0 mmho at 678 Hz, 800 Hz and 1000 Hz probe tone
Volume range:
0.0 ml to 6.0 ml (compensated)
Test time:
~5 seconds
Accuracy:
Pressure:
5 % or
10 daPa, whichever is greater
Compliance:
5 % or
0.1 ml, whichever is greater
Graphical display:
x-axis: Pressure in daPa
y-axis: Compliance in ml (226 Hz, 678 Hz, 800 Hz) and
mmho (1000 Hz)
Test types:
Tympanometry
Automatic, where the start and
stop pressure can be user-
programmed in the setup function.
Eustachian tube function 1
– Intact eardrum
Williams test
Eustachian tube function 2
– Perforated eardrum
Toynbee test
4
THD = Total Harmonic Distortion
Summary of Contents for MI 24
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