8
Operation
en
GB
F
I
E
P
NL
DK
S
N
FIN
J
CN
ROK
PL
HR
H
RUS
CZ
GR
LT
LV
EST
SLO
SK
M
TR
Checking the accuracy
)
Check the accuracy of your CLL 11/PLL 11/
CLG 15 regularly and particularly before important
measuring tasks.
Checking the accuracy of the levelling
Set the instrument on a tripod half-way between two
walls (A+B) that are approx. 5 m apart.
Place the Lock switch
3
in the "Unlocked" (
)
position.
Direct the instrument at wall A and switch on the inst-
rument. Activate the horizontal laser line or laser dot and
mark the position of the line or the dot on wall A (-> A1).
Rotate the instrument by 180° and mark the horizontal
laser line or the laser dot in exactly the same way on wall
B (-> B1).
Then place the instrument at the same elevation as
close as possible to wall A and again mark the horizontal
laser line or the laser dot on wall A (-> A2) . Rotate the
instrument by 180° again and mark the laser on wall B (-
> B2). Measure the distances of the marked points A1-
A2 and B1-B2. Calculate the difference of the two
measurements. If the difference does not exceed 2 mm,
then the CLL 11/PLL 11/CLG 15 is within tolerance.
| (A1 - A2) - (B1 - B2) |
d
2 mm
A1
B1
2.5 m
2.5 m
A1
A2
B1
B2
5 m
