Maico MA 33 Operation Manual page 42

1 Khz & Errors: 1000 Hz will be retested as well as all frequencies containing recorded
errors.
Figure 48
To change the language of the instructions the test person hears during the test, click on
the arrow button next to the Voice Prompt button (Figure 49) to open the dropdown
menu with the available voice prompt languages.
Start Level: Level at which the automatic test will be initiated. This level can only be as
low as the Minimal Level. (Choose from 0 dB to 90 dB in 5 dB steps.)
Minimal Level: This is the lowest level that will be tested in the automatic mode. (Choose
from 0 dB to 90 dB in 5 dB steps.
Maximal Level: This is the highest level that will be tested in the automatic mode. (Choose
from 0 dB to 90 dB in 5 dB steps.)
Pause: Pause duration between tone presentations in addition to the randomized time
variable (choose from 1 to 99 seconds) (Figure 49).
Figure 49
5.5.2.4 Masking
When measuring a pure tone audiogram, you need to assume that the measured hearing
threshold is correct. But if you recognize that sound is also transmitted through bone
conduction over the entire skull, it is probable that the opposite ear also receives sound.
This is called "crossover".
Crossover can also occur when measuring air conduction because a small amount of air
conducted sound is received by the skull and transmitted by bone. Whether the crossover
signal can be heard by the opposite ear, depends on its inner ear function.
Relevant to crossover, is the sound level which is received by the opposite ear. The
difference between the original test signal with the test ear and the received signal at the
opposite ear is called "interaural attenuation".
NOTE: Please advise the patient to inform you with which ear he/she hears the test
signal. In doing so, it will be easier to detect crossover.
To ensure that the patient does not experience crossover, you must mask the opposite
ear. Masking increases the hearing threshold of the opposite ear.
8100092 Rev. 9
Voice Prompt (Figure 48):
Activate this option to allow voice prompts to be presented to the
patients during testing. These include instructions at the
beginning and the ending of the test and error messages if the
test person is answering not correctly.
Deactivate this option to conduct testing without any voice
prompts to instruct the patient.
Operation Manual MA 33
40 19/08/2019