Bosch Professional GIM 60 L Original Instructions Manual page 21

Accuracy Check and Calibration of the Measuring
Tool
Checking the Measuring Accuracy (see figure E)
Check the accuracy of the measuring tool prior to critical meas-
urements, after intense variations in temperature as well as
after heavy impact.
Before measuring grades < 45°, the accuracy check should take
place on a level and roughly horizontal surface; before measur-
ing grades > 45°, on a level and roughly vertical surface.
Switch on the measuring tool and place it on the horizontal/ver-
tical surface.
Select the measuring unit ° (see "Changing the Measuring Unit
(see figure A)", page 19).
Wait for ten seconds and note down the measured value.
Rotate the measuring tool by 180° around its vertical axis. Wait
again for ten seconds and note down the second measured
value.
Calibrate the measuring tool only when the difference
u
between both measured values is greater than 0.1°.
Calibrate the measuring tool in the position (vertical or hori-
zontal), in which the difference of the measured values has been
determined.
Calibration for Horizontal Surfaces (see figure F)
The surface onto which you place the measuring tool must not
deviate from the horizontal surface by more than 5°. If the devi-
ation is greater, the calibration process is discontinued with the
indicator ‑‑‑.
Switch on the measuring tool and position it on the hori-
➀
zontal surface so that the spirit level for horizontal align-
ment (1) faces upwards and the display (7) faces you.
Wait for ten seconds.
➁ Then press the calibration button Cal (21) for approx.
two seconds until CAL1 appears briefly on the display.
Then the measured value will flash on the display.
Turn the measuring tool 180° around the vertical axis so
➂
that the spirit level still faces upwards but the display (7)
is facing away from you. Wait for ten seconds.
➃ Then press the calibration button Cal (21) again. CAL2
will be shown briefly on the display. Then the measured
value (no longer flashing) will appear on the display. The
measuring tool has now been recalibrated for this sup-
porting surface.
Afterwards you must calibrate the measuring tool for the
➄
opposite surface. Rotate the measuring tool around the
horizontal axis so that the spirit level for horizontal align-
ment (1) faces downwards and the display (7) faces
you. Place the measuring tool on the horizontal surface.
Wait for ten seconds.
Then press the calibration button Cal (21) for approx.
➅
two seconds until CAL1 appears briefly on the display.
Then the measured value will flash on the display.
Turn the measuring tool 180° around the vertical axis so
➆
that the spirit level still faces downwards but the dis-
play (7) is facing away from you. Wait for ten seconds.
Then press the calibration button Cal (21) again. CAL2
➇
will be shown briefly on the display. Then the measured
value (no longer flashing) will appear on the display. The
measuring tool has now been recalibrated for both hori-
zontal supporting surfaces.
Note: If the measuring tool is not turned around the axis shown
in the figure in steps ➂ and ➆, then the calibration cannot be
completed (CAL2 is not indicated in the display).
Calibration for Vertical Surfaces (see figure G)
The surface onto which you place the measuring tool must not
deviate from the vertical surface by more than 5°. If the devi-
ation is greater, the calibration process is discontinued with the
indicator ‑‑‑.
➀ Switch on the measuring tool and position it on the ver-
tical surface so that the spirit level for vertical align-
ment (8) faces upwards and the display (7) faces you.
Wait for ten seconds.
➁ Then press the calibration button Cal (21) for approx.
two seconds until CAL1 appears briefly on the display.
Then the measured value will flash on the display.
Turn the measuring tool 180° around the vertical axis so
➂
that the spirit level still faces upwards but the display (7)
is facing away from you. Wait for ten seconds.
Bosch Power Tools
English | 21
1 609 92A 58J | (29.11.2019)