Turn calibration beam to head direction till the screen appear STOP and
stop turning. The screen will indicate "calculating staged calibration data,
please prepare next calibration", at this time, operator can move the
calibration bar to prepare the next calibration step.
8.2.1.3 Calibration step 2
After calibration step 1 finished, operator need to move the right side of
calibration bar backward about 300mm, back to original 1m position,
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