ATEIS IDA8C - Manual (Page 135)

Product Features 135
© 2012 ATEÏS
14.If the White Noise Level goes down to -40dB and the over LED is lighted up, this means the
calibration has failed at this time, and the DNM received the sound too loud, please check:
Is The sound of loudspeaker is too loud?
Is the distance too close between DNM and loudspeaker?
Is the DNM damaged ?
15.After calibration finished, DNM starts to work, It increases the level of audio if there is some noise
detected by DNM.