90
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
accurately to measure the horizontal distance of BC precisely.
4. Obtain the distance measurement constant of the
instrument: K= AC-(AB+BC)
K should be close to zero, if | K | > 5 mm ,it should be send to
standard baseline field for strict checking, then calibrate it based
on the checking value.
Calibration
If it turns out the instrument constant does not close to 0 but
changing after strict inspection , you need to calibrate it,and set
the instrument additive constant according to the comprehensive
constant K value . Such as: the K has been measured as „-5‟
according to the method above, and the original instrument
constant is „-20‟, so the new value should be set as „-20-(5) =-15‟;
Input „-15‟ through "menu-> 6-> 3" and then confirm.
Cross center on the ground
A
C
B
0