Operating Instructions MA 50
Geba_MA50_Fe_11a.doc 14 851 406/2 11/11
5 Quick reference guide
5.1 Startup settings
Air conduction on both channels
Pure tone with a level of 30dBHL on the right ear
Narrow band noise with a level of -10dBHL on the left (masking) ear
Presenter mode
5.2 Receiver selection
Press the RECEIVER key to select the receiver (AC, BC, INSERT). The
corresponding LED above the key lights.
Not available receivers will be skipped.
After a new selection the level will be reset to 30dBHL for the signal and -
10dBHL for masking.
5.3 Frequency selection
Use the frequency keys and to select the frequency. The maximum and
minimum frequency depends on the receiver you have selected.
5.4 Warble tone (FM)
Press the FM key to activate the warble tone.
Press the FM key again to switch back to pure tone.
5.5 Pulse tone
Press the PULSE key to activate the pulse tone.
Press the PULSE key again to deactivate pulsing.
5.6 Test channel selection
Press the test channel selector key to select the left or right ear for testing.
5.7 Tracking function
Press the TRACK key to activate tracking. The selected test channel tracks
now the masking level at the opposite ear.
Press the TRACK key again to deactivate tracking.
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