Maico MA 53 Operating Instructions Manual

Contents

Maico MA 53 Operating Instructions Manual Manual pdf 7 page image

Operating Instructions MA 53Geba_MA53_e_13a.doc 5 851 430/3 11/112 DescriptionThe MA 53 is a two-channel audiometer for pure tone and speechaudiometric tests. It can be used for ENT diagnostics and hearing aid fittingsin the office, and for mobile audiometry in clinics, homes and abroad.Tests can be performed using the DD45 headphones (AC), the optional highfrequency headphones HDA 200, B 71 bone conduction receiver (BC) oroptional insert phones and loudspeakers (FF). Built-in test signals are puretone, pulse tone, warble tone, narrow band and broadband noise. The MA 53has stereophonic microphone inputs for live speech audiometry, an input foran optional tape/CD player with speech test material and an additional inputfor a second tape/CD player (i.e. for external masking signals).The MA 53 audiometer with the standard DD 45 delivers 11 air conduction(AC) test frequencies from 125 Hz to 8 kHz, with levels from -10 dBHL to 120dBHL.With the optional high frequency HDA 200 it delivers 17 air conduction (AC-HF) test frequencies from 125 Hz to 16 kHz, with levels from -20 dBHL to 120dBHL.Bone conduction (BC) can be tested with 11 test frequencies from 125 Hz to8 kHz with levels from -10 dBHL to 70 dB HL (with the standard boneconductor B 71 the frequency range is limited from 250 Hz to 6 kHz).The optional insert phones EAR 3A submit levels from -10 dBHL to 120 dBHLwith 11 test frequencies from 125 Hz to 8 kHz.Optional loudspeakers are available for free sound field measurements (FF).The new, portable loudspeakers MAICO SBC have a dynamic range from -10dBHL to 80 dBHL at 1m distance, for nine test frequencies from 500 Hz to 8kHz. The frequency range for speech is 500 Hz to 8 kHz with levels up to 80dBSPL.The Canton loudspeakers (not available in the USA), deliver levels up to 90dBHL at 1m distance over the entire frequency range from 125 Hz to 8 kHz.The MA 53 has also separate line level outputs for an external amplifier.The hearing level is controlled independently for each channel by twodetented dials on the left and right of the instrument which can be operatedfrom the side or the top. The level steps are 5 dB and can be changed to 2 dBor 1 dB. The signal STIM bar and the frequency up/down keys are just besidethe level control knobs for easy one handed control of level, frequency andsignal presentation.