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.
8.2.1.4 Calibration step 3
After calibration step 2 finished, move the calibration bar backward
about 1m, so the distance from calibration bar to turntables is about 2m.
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