Maico MA 53, Руководство по эксплуатации

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Operating Instructions MA 53
Geba_MA53_e_13a.doc 36 851 430/3 11/11
7 Advanced features
7.1 Complex mixing
The complex mixing feature of the MA 53 allows the operator to route two
different test signals to the same ear. The test signals and the test levels are
independently adjustable but will be presented to one ear (ipsilateral). This
feature could be used to test with speech in noise, competing message tests,
tone on noise or several other
combinations.
- To enter the complex mixing press the
swap key

longer than 2 seconds.
- The LCD-display

shows the mixing
selections (see picture 38).
- Use the left frequency up key

to switch on the mixing for the left ear and
the right frequency up key

→ for the right ear.
- Picture 39 shows i.e. the LCD-display for
enabled mixing on the left ear.
- Store the selection by pressing the STIM
bar

or

↔.
- The LCD-display

now shows the actual
setting for mixing. In the example picture
40 is a pure tone with a level of 30 dBHL
and a narrow band noise with a level of 30
dBHL, both with a frequency of 1000 Hz,
presented to the left ear.
Adjust hearing level and the test signal
independently for both channels. Both
signals will be mixed and presented to the left ear.
You can also select other receivers like BC, FF or insert phone for the left ear
with the left receiver selector key

.
Other possible selections are mixing with presentation to the right ear or to
both ears.
To exit the complex mixing press the swap key

longer than 2 seconds and
switch the mixing for the left and the right ear to the off position.
Picture 38 MA 53 display with
mixing selection screen
Picture 39 MA 53 display with
mixing selection for the left ear
Picture 40 MA 53 display with
selected mixing for the left ear