Topcon DL-501 Instruction Manual page 118

21. CHECKS AND ADJUSTMENTS
7. Measure staff b.
8. Press [OK] to accept the results.
9. Measure staff b.
10. Press [OK] to accept the results.
11. Measure staff a.
12. Press [OK] to accept the results.
13. Move the instrument to a position
approximately 3m from staff a along a straight
line joining staffs a and b. The new position is
B.
14. Perform pre-measurement of staffs a and b to
check that a is approximately 3m from the
instrument and b is approximately 33m from
from the instrument. Press [OK] to confirm.
15. Repeat steps 5 to 12, sighting the two staffs
and taking the readings.
16. Check the difference between the results and
decide whether correcting the reference value
of the sensor is required.
If the difference is 0.3mm or less, no
adjustment is necessary.
If the difference is over 0.3mm, adjustment is
necessary.
110
A a b b a
R h 1 . 3 4 5 6 0 m
H d 1 5 . 0 8 0
A a b b a
R h 1 . 3 4 5 6 0 m
H d 1 5 . 0 8 0
A a b b a
R h 1 . 0 0 5 4 0 m
H d 1 5 . 0 1 0
P r e . m e a s .
R h
H d
3m
B a
T I L T C N F G
h 1 - 0 . 3 4 0 2 0 m
h 2 - 0 . 3 4 0 0 0 m
D i f . 0 . 2 0 m m
m
S
O K
m
S
O K
m
S
O K
S
33m
b
O K F O C U S
N O Y E S