Operating Instructions MA 42
Operating_Instructions_8100460-6_MA42_e_15a 36 8100460-6 1/15
6.2.2 Tone audiometry
Frequency selection
Use one of the two sets of frequency keys (4) or (5) to select the frequency. The
maximum and minimum frequency depends on the receiver you have selected.
Warble tone
Press the Test signal button (12) to activate the warble tone. The LED will
highlight Warble.
Pulse tone
Press the Test signal button (12) to activate the pulse tone. The LED will
highlight Pulse.
Overthreshold tests
Press the Test mode button (13) until OT Tests is selected. The functional
selector buttons below the display will show the available over threshold tests.
Use the button (9) for Decay test and button (11) for SISI test, button (13) for
ABLB test or button (15) for MLB test. Select the left or right ear and adjust the
parameters. For the Decay or SISI test press the Start button (19) on the right
side of the display to start the test. Stop the test by pressing the Stop button
(18) on the right side of the display. To end the selected test, press the Exit
button (6) on the left side of the display.
Tracking function
Press the TRACK key (14) to activate tracking. Both channels will change level
when only one attenuator is adjusted.
STIM Mode selection
Press STIM MODE (8) key to switch between continuous presentation and
presentation by pressing the STIM button (2). When in continuous presentation
mode the STIM buttons function as interrupters. The light above the STIM
MODE key is on if continuous presentation is selected.
Speech and noise are always in continuous presentation, except when both
channels are selected as noise.
Interlock function
Press the LOCK/UNLOCK key to activate the interlock function. Signals from
both channels will be presented simultaneously with the press of only one STIM
button (2).
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