NEC MD21GS-3MP Installation & Maintenance Manual page 13

Self Calibration
9. Press "SELECT" to start the calibration. Stand-alone calibration may take several minutes depending on user settings.
10. After the CALIBRATION SUCCEEDED message appears (Figure S.9), press SELECT.
11. To end the calibration mode, press "EXIT".
Figure S.3
Figure S.6
Figure S.9
Figure S.4
Figure S.7
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Figure S.5
Figure S.8