Checking the Horizontal Levelling Accuracy of the Lateral Axis
Afree measuring distance of
–Mount the measuring tool onto the holder or a tripod, or place it on a firm and level surface at a distance of
Checking the Horizontal Levelling Accuracy of the Longitudinal Axis
Afree measuring distance of
–Mount the measuring tool onto the holder or a tripod, or place it on a firm and level surface close to wall A. Switch the measuring tool on and select
65 | ft |
|
–Direct one of the two lateral laser beams, that run alongside the lateral axis of the measuring tool, at the wall. Allow the measuring tool to level in. Mark the centre of the laser beam on the wall (point I).
d
180°
A | B |
65 ft
–Direct the horizontal laser beam, which runs parallel to the longitudinal axis of the measuring tool, at the close wall A. Allow the measuring tool to level in. Mark the centre of the laser beam on the wall (point I).
A |
|
|
| B | |
180° | |||||
|
| ||||
|
|
|
|
| |
|
|
|
|
| |
|
|
|
|
| |
–Rotate the measuring tool by approx. 180° without changing its height. Allow it to level in and mark the centre point of the other lateral laser beam on the wall (point II). Take care that point II is as vertical as possible above or below point I.
–The difference d of both marked points I and II on the wall results in the actual height deviation of the measuring tool alongside the lateral axis.
On the measuring distance of 2 x
Thus, the difference d between points I and II may not exceed 1/2" (max.).
–Turn the measuring tool around by 180°, allow it to level in and mark the centre point of the laser beam on the opposite wall B (point II).
–Without turning the measuring tool, position it close to wall B. Switch the measuring tool on and allow it to level in.
A | B |
GCL 25 Manual with translations.indd 10 | 4/24/12 8:29 AM |