Johnson Level & Tool Mfg. 1880-4800 - Manual (Page 9)

©2013 Johnson Level & Tool - Rev. 1 9
6. Self-Calibration
To Calibrate this unit:
Quick Level Calibration
1. Turn the digital level on.
2. Hold the digital level against a wall making sure the level
bubble is centered in the vial.
3. While keeping the digital level in the level position push and
hold the CAL button in for 3 seconds.
4. “CAL” will flash on the LCD indicating the digital level is in the
calibration process.
5. If the digital level is not kept stable or if the digital level is
tipped to far forward or backward, “ERRO” will appear on the
LCD. Push the Calibration Button one time to exit calibration
mode and repeat the procedure.
6. If the calibration procedure is successful, the LCD will display
“rdy”. The calibration procedure is completed and the digital
level will exit the calibration procedure automatically.
Quick Plumb Calibration
1. Turn the digital level on.
2. Hold the digital level against a wall making sure the plumb
bubble is centered in the vial.
3. While keeping the digital level in the plumb position push and
hold the CAL button in for 3 seconds.
IMPORTANT: It is the responsibility of the user to verify the
calibration of the instrument before each use.
7640H-English_Manuals 12/11/13 4:18 PM Page 9