Maico MA 53 Operating Instructions Manual

Contents

Maico MA 53 Operating Instructions Manual Manual pdf 28 page image

Operating Instructions MA 53Geba_MA53_e_13a.doc 26 851 430/3 11/115.2 Speech calibration5.2.1 Calibration of the CD with speech test materialThe MA 53 must be calibrated to theparticular speech test material in use toensure valid test levels. That means everytime you change the CD or tape you mustrecalibrate the instrument.To calibrate the Tape/CD speech inputselect TAPE/CD with the left SIGNALselector key .Press the left SIGNAL key  longer than 2seconds.In the lower area of the display  the textCalibration appears. You also see theactual settings in % of the maximumcalibration for both channels (see picture32).On every CD or tape with speech testmaterial you have a reference signal, suchas a reference tone or speech simulatingnoise.Perform the reference signal with CD.Use the left knob  for the left channel and the right knob ↕ for the rightchannel and adjust the levels until both VU-meters  and  show all yellowand one green light.If one or more red lights are on, reduce the level using the correspondingknobs  or ↕.Store the calibration by pressing the STIM bar  or ↔.5.2.2 Calibration of the microphone for live speech testTo calibrate the SPEECH MIC input selectMIC with the left SIGNAL selector key .Press the left SIGNAL key  longer than 2seconds.In the lower area of the display  the textCalibration appears. You also see the actualPicture 31 MA 53 controls and displaysfor speech calibrationPicture 32 MA 53 display withspeech calibration of CD-player or tapePicture 33 MA 53 display withspeech calibration of the microphone