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D-0126050 rev 1 -
270+ Operating Manual
4.8.3.
PERFORMING PURE TONE AUDIOMETRY
Use the
SIGNAL
button to choose either AC or BC
testing.
Use the Channel 1 rotary control to control the level of the test stimulus. Use the
◄
left and right key
►
to
change the frequency.
Use the
> 100 dB
button, in order to present tones louder than 100 dB.
To change the ear, select either the
EAR
or the
F4
button.
To present (or interrupt) the test stimulus, select the
PRESENT
Button.
When a test tone is presented, the LED above the display labeled with
PRESENT
will
illuminate.
When the test person is pressing the patient response switch, the LED above the display
labeled with
RESPONSE
will illuminate.
Store the obtained threshold for the selected frequency by pressing the store button. The stored threshold will
then show on the screen.
Please note:
Previous audiometric test results can be shown on the screen while running a new test
sequence. Refer to chapter 4.7.3 to learn more about how to show previous stored test results.
4.8.4.
MASKING (PURE TONE AUDIOMETRY)
4.8.4.1.
BC MASKING TRANSDUCERS
When no insert phones are used, the masking of the bone conduction might be considered challenging when
it is required to place both headphones and bone conductor on the patient
’s head. In this case, the masking
earpiece can be used to mask the contralateral ear while the bone conduction is tested.
Содержание 270+
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