System Products 135
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12.If the White Noise Level goes up to 0dB and the 'Under LED' is lighted up, the calibration has
failed at this time, and the DNM can't receive the calibration noise coming from loudspeaker,
please check:
Is the sound of loudspeaker is too small?
Is the distance too far between DNM and loudspeaker?
Is the DNM damaged?
13.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 ?