Leica Geosystems NA2, Руководство пользователя

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NA2/NAK2-2.0.0en
Checking and adjusting
21
Checking and adjusting of the line-of-sight
Checking (see figure):
1. Choose a flat terrain between
45 and 60 m ling and divide
into three equal sections d.
2. Set up a staff at points A & B.
3. Set up the level at point 1,
centre the bubble and press
the compensator button.
4. Readings A1 and B1 are
taken to the staffs.
5. Set up the level at point 2.
6. Readings A2 and B2 are taken
to the staffs.
7. Find nominal reading A2;
Reading A1 - B1 + B2
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.
NA-45
NA-44
d d d A B
A2 B2
A1 B1
1
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.