Nikon NPL-322, Instruction Manual

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Total Station NPL-322 Instruction Manual 19
Preparation 2
•
When measuring a short distance, incline the prism slightly so that the EDM
can ignore unnecessary reflections on the prism surface, as shown below.
Measurement in Reflectorless mode
The intensity of the reflection from the target determines the distance the NPL-322
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 measureable
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.
Hold the prism securely in place and do not move while taking measurements.
In Prism mode, in order to avoid false measurements on objects other than the prism or reflector-sheet, targets
that are less reflective than the prism or reflector sheet are not measured. Even if you start a measurement,
measured values are not displayed. To measure less reflective objects, use the N-prism (reflectorless) mode
Target You can measure approximately...
Traffic signs, reflectors 500 meters (1640 feet)
Paper (white), veneer (new) 200 meters (660 feet)
wall (brightly painted), brick 100 to 200 meters (330 to 660 feet)
Make sure there are no obstacles between the instrument and the target when taking measurents.
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.