GeoMax ZAL 120 Series Gebrauchsanweisung Seite 8

4. Checking and adjusting of the line-of-sight
EN
DE
H=1.832 H=1.616
ES
δ
PT
I
1
IT
PL
A
RU
d
With the circular bubble centred and
adjusted, the line of sight should be hori-
zontal.
Checking (see example):
1. Choose a distance of appr. 30 m
within a gentle terrain.
2. Set up a staff at both final points (A, B).
3. Set up the instrument at point I
(halfway between A and B, just pass it
down) and centre the bubble.
Checking and adjusting of the line-
of-sight
actual = 1.604
δ
I
2
B
A
d
4. Read both staffs.
reading on A = 1.832 m
reading on B = 1.616 m
Δ
H = A - B = 0.216 m
5. Set up the level about 1 m from staff A
6. Read staff A (eg.: 1.604 m)
7. Find nominal reading B; eg.: Reading
Δ
A - H = 1.604 m - 0.216 m = 1.388 m
1
8. Read staff B, compare nominal-/
actual- reading.
I
ZAL 120/124/128/132 | 4
δ
nominal
= 1.388
B
When the difference nominal-/
actual- reading is more than 3 mm
the line of sight must be adjusted.
1. Turn the adjusting srew until the
middle hair gives the required reading
(eg. 1.388 m).
2. Check line of sight again.
Before starting field work or after
long periods of storage/transport of
your equipment check the field
adjustment parameters specified in
this User Manual.