Maico MA 53 Operating Instructions Manual

Contents

Maico MA 53 Operating Instructions Manual Manual pdf 19 page image

Operating Instructions MA 53Geba_MA53_e_13a.doc 17 851 430/3 11/11Notice that the masking sound is continuously presented for effectivemasking. You can interrupt the masking signal by pressing the correspondinginterrupter key  or ↔.To mask when performing bone conduction testing, place the headphone onthe opposite ear so that the receiver is at the correct height (the sound outputgrid  exactly faces the ear canal). Adjust the headband of the headphones.The receiver on the side where the bone conductor is placed should sit directlyon the cheek bone.The marking for air conduction with masking should be done with thesymbols  = the right side and ■ = the left side on the audiogram form. Themarking for bone conduction with masking should be done with the symbols[ = the right side and ] = the left side on the audiogram form.4.4.4 Automatic masking:With the manual masking, as described before, you have to readjust themasking level every time you change the test signal level. The MA 53 has atracking feature for easy masking.Adjust for the test signal using the level control knob or ↕, then with theopposite level control knob  or  adjust for the corresponding maskinglevel.Now press the TRACK button . Themasking level is automatically changed ifyou adjust the test signal level. (e.g. if thetest level was 30 dB and the masking level50 dB and you change the test level to 45dB the masking level is automaticallyadjusted to 65 dB).Picture 15 MA 53 display for boneconduction with masking and enabledtracking function