（H=H1-H2+h/2）,and mark O’the highest dot among A, B, C and D. to measure H value, it is the reference dot of
placing the instrument transversely.
（5）Measure h’ from E to O’, if h＇≤6mm, the instrument accuracy is qualified. If 6mm＜h＇≤30mm, the instrument
accuracy is out of tolerance, if h＇＞30mm, the instrument accuracy is out of tolerance, please contact the distributor.
5.2 Accuracy calibration
According to the accuracy check result, mark O at h/2(the distance of highest and lowest dot among A. B , C and D)..
(1) enter into calibration status
a power off the instrument, face X axis to the wall
b. press on/off key and TILT mode key at the same time, and then release on/off key and continue hold TILT mode key,
after X.Y LEDS flash three times, release TILT mode key, the instrument will enter calibration status, and continue
rotating.
（2）X axis direction
a. Press self-calibration direction on remote control, the X calibration LED flash on the instrument keypad, the
instrument will enter X direction calibration.
b. Press the self-calibration adjustment key on remote control, move the laser line up and down, until it coincide with dot
O.
（3）Y axis direction calibration
a. Under calibration status, turn the instrument by 90 degree, make Y axis face to the wall.
b. Press self-calibration direction select key on remote control, Y calibration LED on instrument keypad flash, the
instrument will enter into Y direction calibration.
c. Press self-calibration adjustment on remote control, the laser line move up and down, until it coincides with dot O.
（4）Calibration confirmation
When X direction and Y direction confirmation are finished, press self-calibration confirmation key, calibration LED is off,
calibration value is saved, the instrument exit calibration status.
（5）Z axis direction calibration
a. Place the instrument vertically
b. Press ON/OFF key and TILT mode key simultaneously, and then release ON/OFF key and continue holding TILT
mode key, until X,Y two LEDs flash three times, and then release TILT mode key, the instrument enter Z axis calibration
status, rotate continuously, Y direction LED flash.
c. Press self-calibration adjustment key on remote control, the laser dot move up and down, until it coincide with dot
O’.
（6） Calibration confirmation
When Z direction calibration is finished, press self-calibration confirmation key, calibration LED is off, the calibration
value is saved, the instrument exit calibration status.
Note: after calibration is finished, it is necessary to power off instrument, after power on it again, the calibration is valid
finally.
X axis is calibrated, it is necessary to make Y axis accuracy check, after Y axis id calibrated, it is necessary to make X
axis accuracy test, until X and Y accuracy conform to requirement, then the instrument calibration is finished.
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