Bosch GPL5 Service Manual download pdf (Page 7)

-7-

Influences on Accuracy

The ambient temperature has the greatest

influence. Especially temperature differences

occurring from the ground upward can divert

the laser beam.

As thermal fluctuation is largest close to the

ground, the tool, if possible, should be

mounted on a commercially available tripod

and placed in the center of the working area.

Apart from exterior influences, device-

specific influences (such as heavy impact or

falling down) can lead to deviations.

Therefore, check the accuracy of the tool

each time before starting your work.

Should the tool exceed the maximum

deviation during one of the tests, see

recalibration procedure or have it

recalibrated by a Bosch after-sales

service center.

Checking the Horizontal Leveling

Accuracy of the Lateral Axis

A free measuring distance of 78 ft on a firm

surface in front of a wall is required for

the check.

– Mount the measuring tool onto the multi-

purpose attachment or a tripod, or place it

on a firm and level surface at a distance of

78 ft to the wall. Switch the tool on.

– Direct one of the two lateral laser beams,

that run alongside the lateral axis of the

tool, at the wall. Allow the tool to level in.

Mark the center of the laser beam on the

wall (point I).

– Rotate the measuring tool by approx. 180°

without changing its height. Allow it to level

in and mark the center 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 tool alongside the

lateral axis.

On the measuring distance of 2 x 78 ft = 156

ft, the maximum allowable deviation is:

156 ft x ±0.0036 in/ft = ±9/16 in (.563).

Thus, the difference d between points I and II

may not exceed 9/16 in (max.).

Checking the Horizontal Leveling

Accuracy of the Longitudinal Axis

A free measuring distance of approximately

78 ft on a firm surface between two walls A

and B is required for the check.

– Mount the tool onto the multi-purpose

attachment or a tripod, or place it on a firm

and level surface close to wall A. Switch

the tool on.

78 ft

d

180˚

possible, e.g. because the surface on which

the tool stands deviates by more than 5° (or

3° from the horizontal plane) the laser beams

flash rapidly.

In this case, bring the tool to the level

position and wait for the self-leveling to take

place. As soon as the tool is within the self-

leveling range of ±5° or ±3° respectively, all

laser beams light up continuously again.

In case of ground vibrations or position

changes during operation, the tool is

automatically levelled in again. To avoid

errors by moving the tool, check the position

of the laser beams with regard to the

reference points upon re-leveling.

Working Advice

• Always use the center of the laser point

for marking. The size of the laser point

changes with the distance

Leveling Accuracy

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