Check & Adjust The Line Of Sight - Leica NA520 Manual De Uso

3.2
Checking the line of
sight
Adjusting the line of
sight
NA520/24/32, Operation
Check & Adjust the line of sight
Step Description

With the circular bubble centred and
adjusted, the line of sight should be
horizontal.
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.
4. Read both staffs.
Reading on A = 1.832 m
Reading on B = 1.616 m
ΔH = 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 A - ΔH = 1.604 m - 0.216 m =
1.388 m.
8. Read staff B, compare nominal-/actual-
reading.
Step Description

When the difference nominal-/actual- reading is
more than 3 mm the line of sight must be adjusted.
1. Turn the adjusting screw 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.
H=1.832 H=1.616
δ
I
1
A
d
003993_001
1
actual = 1.604
nominal
I
2
= 1.388
A
003994_001_en
003995_001
en
δ
B
d
δ
B
10