Checking The Level Accuracy Of The Vertical Line; Checking Plumb Accuracy - Bosch GCL 2-15 Professional Original Instructions Manual

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Checking the Level Accuracy of the Vertical Line

For this check, you will need a door opening (on solid
ground) which has at least 2.5 m of space either side of the
door.
– Place the measuring tool 2.5 m away from the door open-
ing on a firm, flat surface (not on a tripod). Select vertical
line mode with automatic levelling. Aim the laser line at
the door opening and allow the measuring tool to level in.
– Mark the centre of the vertical laser line on the floor of the
door opening (point Ⅰ), 5 m away on the other side of the
door opening (point Ⅱ) and on the upper edge of the door
opening (point Ⅲ).
– Rotate the measuring tool 180° and position it on the
other side of the door opening, directly behind point Ⅱ.
Allow the measuring tool to level in and align the vertical
laser line in such a way that its centre passes through
points Ⅰ and Ⅱ exactly.
– Mark the centre of the laser line on the upper edge of the
door opening as point Ⅳ.
– The discrepancy d between the two marked points Ⅲ and
Ⅳ reveals the actual vertical deviation of the measuring
tool.
– Measure the height of the door opening.
You can calculate the maximum permitted deviation as fol-
lows:
Doubled height of the door opening × 0.3 mm/m
1 609 92A 4HE | (09.08.2018)
Example: At a door opening height of 2 m, the maximum de-
viation amounts to
2 × 2 m × ±0.3 mm/m = ±1.2 mm. The points Ⅲ and Ⅳ
must therefore be no further than 1.2 mm from each other.

Checking Plumb Accuracy

For this check, you will need a clear measuring space on firm
ground with a distance of approx. 5 m between the floor and
the ceiling.
– Mount the measuring tool onto the rotating mount (13)
and place it on the floor. Select point mode and allow the
measuring tool to level in.
– Mark the centre of the top laser point on the ceiling
(point I). Also mark the centre of the bottom laser point
on the floor (point II).
d
– Turn the measuring tool by 180°. Position it so that the
centre of the bottom laser point falls onto the marked
point II. Allow the measuring tool to level in. Mark the
centre of the top laser point (point III).
– The discrepancy d between the two marked points Ⅰ and
Ⅲ on the ceiling reveals the actual deviation of the meas-
uring tool from the vertical plane.
You can calculate the maximum permitted deviation as fol-
lows:
Doubled distance between floor and ceiling × 0.7 mm/m
Example: At a floor-to-ceiling distance of 5 m, the maximum
deviation amounts to
2 × 5 m × ±0.7 mm/m = ±7 mm. The points Ⅰ and Ⅲ must
therefore be no further than 7 mm from each other.
5 m
180°
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