Checking And Adjusting Of The Line-Of-Sight - Leica Jogger 20 User Manual

4. Checking and adjusting of the line-of-sight

H=1.832 H=1.616
δ δ
I
1
A
d d
With the circular bubble centred
and adjusted, the line of sight
should be horizontal.
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
I
2
B
A
4. Read both staffs.
reading on A = 1.832 m
reading on B = 1.616 m
∆
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 A -
1
0.216 m = 1.388 m
8. Read staff B, compare nominal-
/actual- reading.
δ
nominal
= 1.388
B
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.
H = 1.604 m -
or after long periods of storage/
transport of your equipment check
the field adjustment parameters
specified in this User Manual.
4
When the difference
Before starting field work
Jogger 20/24-1.0.0en
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DE
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