The calibration menu allows for three main functions, Manual calibration, Automatic calibration and Microphone check. It also shows a real-time spectrum of current input and a calibration history graph.
Auto/manual

The Automatic calibration is normally sufficient, and provides a simple means of calibrating. If one prefers to change the calibration manually, the Manual option gives the possibility to adjust the calibration level manually with +/- buttons.

Microphone check

The Microphone Check function provides a means of verifying that the microphone is in good condition. The Nor150 generates a signal which is output to the microphone. If the signal deviates significantly from normal values, the microphone must be checked and recalibrated.

Microphone calibration

Accelerometer calibration