Preparation 2
Pulse Laser Station NPL-302 Series Instruction Manual 19
As the NPL-362/352/332 is extremely sensitive, multiple reflections on the prism
surface can sometimes cause a significant loss in accuracy.
To maintain the accuracy of your measurements:
• When using a reflector sheet, take measurements longer than 5 meters.
• When using a mini or standard prism, take measurements longer than 10 meters.
• When measuring a short distance, incline the prism slightly so that the EDM can
ignore unnecessary reflections on the prism surface, as shown in Figure 2.2
Figure 2.2 Angling the prism
Measurement in Reflectorless mode 21.2
The intensity of the reflection from the target determines the distance the
NPL-362/352/332 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.
Table 2.2 describes some examples of targets and approximate measureable
distances.
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.
Table 2.2 Targets and measurement distances
Target You can measure approximately...
Traffic signs, reflectors 500 meters (1640 feet)
Paper (white), veneer (new) 200 meters (660 feet)
wall (brightly painted), brick 50 to 100 meters (160 to 330 feet)
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