Maico MA 53 Operating Instructions Manual

Contents

Maico MA 53 Operating Instructions Manual Manual pdf 20 page image

Operating Instructions MA 53Geba_MA53_e_13a.doc 18 851 430/3 11/114.5 Diagnostic tests4.5.1 Suprathreshold testsThe MA 53 offers additional suprathreshold tests which can offer moreinformation about the kind of the hearing loss.To access suprathreshold tests press thePULSE button  longer than two seconds.The suprathreshold test menu is nowdisplayed on the lower part of the LCD-display  (see picture 16). The actualchoice is displayed inversely. You cantoggle through the different options by briefly pressing the PULSE button .Start the chosen option by pressing the STIM bar  or ↔.To exit theSupratreshold test menu briefly press the FM button .4.5.1.1 The ABLB (Fowler) TestThe Alternate Binaural Loudness Balance test is a recruitment test which usesthe presentation of alternating tones between the two ears with headphones.The intensity of the tone in the hearing-impaired ear is varied until theloudness of the tone is judged by the patient to be equivalent to a tone at aconstant intensity in the normal ear. This is called loudness balance. The test isdone for various intensity levels in the normal ear.To start the test select 0.5 sec. or 1 sec. modulation time in thesuprathreshold menu (as described before under 4.5) and press the STIM bar or  ↔.On the LCD-display  is ABL with the chosen modulation time shown (seepicture 17).Adjust the desired hearing levels for boththe normal ear and the impaired ear usingthe level control knobs  and ↕.Press the STIM MODE button  to presentthe signal continuously.Now change the level for the hearing-impaired ear with the level control knob↕ or  until the patient indicates that the loudness in both ears is equal.Note the levels and proceed with other levels and frequencies as required.To exit the test, briefly press the PULSE button .Picture 16 MA 53 display withsuprathreshold menuPicture 17 MA 53 display with ABLB test