Maico MA 42 Operating Instructions Manual

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Maico MA 42 Operating Instructions Manual Manual pdf 24 page image

Operating Instructions MA 42Operating_Instructions_8100460-6_MA42_e_15a 22 8100460-6 1/155.1.8 ABLBThe Alternate Binaural Loudness Balance test is a recruitment test. Alternatingtones between the two ears with headphones are used. The intensity of thetone in the better hearing ear is varied until the loudness of the tone is judgedby the patient to be equivalent to a tone at a constant intensity in the normalear. This is called loudness balance.To start the test select OT Test with the functional selector button (13), chooseABLB, then the ABLB test screen will be displayed:Figure 8 – ABLB screenThe test can be performed at all frequencies between 125 Hz and 8 kHz. Selectthe test frequency by the frequency up and down key (4) and (5). Set the levelof the better hearing ear 5 dB above the threshold. Present the left or rightstimulus presenter bar (2). Adjust the level of the hearing-impaired ear with thelevel control (1) until the loudness in both ears matches. Press the left or rightsave button (3). Repeat the test for several levels.To perform the test at another frequency, press the frequency up or down key(4) or (5). A new ladder diagram appears. Use the functional selector button (9)or (11) to jump to the previous or next diagram. Select 500 ms or 1000 ms asmodulation time by the functional selector button (13). To exit the ABLB testscreen press the EXIT button (6).5.1.9 MLBThe Monaural Level Balance test is a test to detect perceived loudnessdifferences between two frequencies in the same ear. A tone with twoalternating frequencies is presented to the same ear. The level of the frequencywith normal hearing threshold is adjusted till it matches to the loudness of theother frequency. The patient has to indicate if the loudness of both frequenciesis equal.