Spectra Precision Focus 8 Series, User Manual

Page: 35 / 70

Spectra Precision Focus 8 Series Total Station User Guide 3 3
Preparation 2
Measurement in reflectorless mode
The intensity of the reflection from the target determines the distance the Focus 8
series can measure in this mode. The color and condition of the target surface also
affect the measurable distance, even if the targeted objects are the same. Some less-
reflective targets may not be measured.
The following table describes some examples of targets and approximate measurable
distances.
Measurable distances may be shorter or measurement intervals may be longer in the
following cases:
•
the angle of the laser against the target is small
•
the surface of the target is wet
In direct sunlight, the measurable distance may be shorter. In this case, try to throw a
shadow on the target.
Targets with completely flat surfaces, such as mirrors, cannot be measured unless the
beam and the target are perpendicular to each other.
Tip – Make sure there are no obstacles between the instrument and the target when
taking measurements.
When you need to take measurements across a road or a place where vehicles or other
objects are frequently moving, take several measurements to a target for the best result.
Target You can measure approximately...
Traffic signs, reflectors 500 meters (1640 feet)
Paper (white), veneer (new) 300 meters (990 feet)
wall (brightly painted), brick 100 to 200 meters (330 to 660 feet)