120
screw, to make the center mark of the plummet coincide with
point O;
Cross center on the ground
A
C
B
0
5. Repeat step 4, check and calibrate until it meet the
requirements;
6. With the laser plummet, unbolt the laser cover, using 1 # hex
wrench to adjust the three screws, fasten one side and loosen the
other side, and adjust the laser flare to point O;
7. Put the cover back in place.
11.8 Addictive constant (K)
The instrument constant is inspected when it out, and
correct it inside the machine, make K = 0. Instrument constant
change rarely, but we suggest that check it this way for one or
two times each year. The checkout should be done in the
standard baseline, or you can take the following simple method.
Checkout
1. Choose a flat field A to set up and level the instrument ,
mark three points A
、
B
、
C in the same line ,their interval is 50m,
and set up the reflection prism accurately;
2. After setting the temperature and atmospheric pressure of
the instrument, measure the horizontal distance of ‘A B’ and
‘ AC’ accurately;
3. Place the instrument at point B then centering it
