Checking And Adjusting Of The Line-Of-Sight - Leica NA2 User Manual

Checking and adjusting of the line-of-sight

Checking (see figure):
1. Choose a flat terrain between
2. Set up a staff at points A & B.
3. Set up the level at point 1,
4. Readings A1 and B1 are
5. Set up the level at point 2.
6. Readings A2 and B2 are taken
7. Find nominal reading A2;
NA2/NAK2-2.0.0en
Find Quality Products Online at:
d A d
A2
A1
1
45 and 60 m ling and divide
into three equal sections d.
centre the bubble and press
the compensator button.
taken to the staffs.
to the staffs.
Reading A1 - B1 + B2
GlobalTestSupply
www.
B d
B2
B1
2
8. Compare the nominal-/actual-
reading for A2.
Parallel plate micrometer
When using the parallel plate
micrometer to perform precise
levelling, follow the same check
procedure using invar staffs and
micrometer reading. When
adjusting, the micrometer is set
to the correct value and the
adjusting screw is turned until
the horizontal hair is on the staff
graduation.
21
When the difference
nominal-/actual- reading is
more than 2 mm the line of sight
must be adjusted.
1. Screw off the protective cover.
2. Turn the adjusting screw until
the horizontal hair gives the
nominal reading A2 on staff A.
The last turn of the adjusting
screw should be clockwise.
3. Screw on the protective cover.
4. Repeat the checking
procedure.
Checking and adjusting
.com
sales@GlobalTestSupply.com