Audio Traveler AA222, Operation Manuals, Page: 116 / 141

AA222 Operation Manual Page 116
AA222 can be set to either Compensated Mode or Non
Compensated Mode. Compensated Mode is used when you
want the tympanometric curve to be displayed at the floor of
the co-ordinate system of the tympanogram. See figure 42.
Non Compensated Mode is used when you want the
tympanometric curve to be displayed including the ear canal
volume. See figure 43.
Gradient Unit:
The Gradient unit is an expression of the shape of the
tympanometric curve (narrow or wide).

If ml is selected the program will go 50 daPa to each
side from compliance value and save the two ml
values. The gradient is the average of the two ml
values subtracted from the compliance value.

If daPa is selected the gradient will be calculated the
following way: The program searches from each end
of the tymp curve and stores the pressure at the point
where the tymp curve is equal to compliance value
divided by 2. Gradient is equal to the two stored
pressures subtracted from one another.
High probe tone frequency:
Note that only when the AA222 was licensed to have the high
probe tones available, the option to select among three
different high probe tones; 678, 800 and 1000 Hz is presented.
From the Tympanometry Setup Menu you select which High
Probe Tone Frequency should be used when selecting the
“High Probe Tone” with button F4 (4) in the tympanometry test.
Tympanometry Scale:
For the tympanic tests is defined which is the default scaling. If
needed, you can set the scaling differently in the test screen by
pressing button F5 (5).