Operation Manual MA 42
8100460 Rev.7 Ver.1
18
12/15
6.1.1
Pure Tone Testing
In the pure tone audiometry, the hearing threshold of the patient is measured
in comparison with the normal hearing threshold. The examination starts with
air conduction on the ear with better hearing.
Upon opening the Tone screen the following settings are displayed.
Default setting: right channel is set to air conduction pure tone and the left
channel to air conduction narrow band noise with manual masking. The
frequency is automatically set to 1000 Hz.
The audiometer provides two channels, which can be separately routed to the
left or right ear. Each channel can play back a signal and can be routed to one
of the outputs. The signal can be set for each channel independently to tone,
narrow band noise or white noise by the functional selector buttons (11) and
(15).
Select the ear to be tested by pressing the Right or Left key (9), (17) on the
control panel underneath the screen.
Next, select the transducer to be used, headphones (Phones), insert phones
(Insert), bone conductor (Bone), or sound field speaker (Speaker) by pressing
the appropriate button (10), (16). Only calibrated transducers are selectable.
The level and frequency of each channel is displayed as a numerical value at
the top of the screen and also as a cursor within the audiogram itself.
The dB
HL
level can be changed with the attenuator knobs on both sides (1) of
the instrument. Set the level control dial to a value just below expected
hearing loss and turn down the level of the other ear.
Use the frequency Plus (4) or Minus (5) keys to increase or decrease the
frequency. Press the STIM button (the blue part next to the attenuator knobs)
Figure 5 - Start Screen
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