10
When calibrating the precision level vials, work on a surface that is level to earth within .001 to .002 in/ft.
A surface that is 10 to 20 ft. in length is ideal. When calibrating to shorter surfaces, do so with the
readout set to the .0001 in. mode. If you are using the A-1519 or A-1520 Wireless Targets with the R-
1356 PDA or with Hamar Laser’s alignment programs, set the readout display through the software.
Figure 6 --
Laser and Target Setup for Calibrating the Precision Level Vials
Zeroing the Targets
The following sections refer frequently to “zeroing” the target. When a target is zeroed, the readout is
reset to zero at the point where the laser beam currently hits the target cell.
When using the A-1519/A-1520 Universal Targets, this is accomplished through the Read15 software (or
through Hamar Laser’s other alignment programs). This reading is stored in memory and then subtracted
from all future readings. Once the target is zeroed, subsequent readings show only the
difference
from the
original reading.
Calculating the Calibration of the Level Vials – Roll Axis
Note:
It is very important to warm up the laser for at least 30 minutes before starting this procedure. It is
also very important to level both the Pitch and Roll axis level vials during this procedure. Failure to do
this makes it nearly impossible to calibrate the levels.
1.
Level the laser.
Using the adjustment knobs, level the laser so
both
the pitch and roll levels are exactly level (see top
of Figure 4).
2.
Zero the target in the Near Position.
Beginning with the Roll Axis, place a target on a point near to the laser. Mark this point so you can
always reposition the target at the same point. Zero the target according to the readout you are using.
3.
Determine Far Reading 1.
Move the target to the Far Point, mark this point and record the target reading. This is
Far Reading 1
.
Measure the distance (D1) between the Near Point and the Far Points and write it down.
Note:
It is recommended to repeat the measurements two or three times to check repeatability.
4.
Determine Far Reading 2.
Rotate the entire laser unit 180 degrees. Re-level the laser using the adjustment knobs so
both
the
pitch and roll levels are exactly level. Return the target to the Near Position, ensuring that it is placed
Содержание Dual Scan L-732
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