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2
Preparation
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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.
Sighting a prism in Reflectorless mode may cause an excessive signal error. In
this case, change the [MSR1] or [MSR2] key Target setting to Prism.
In the Reflectorless mode, the beam passing area is
shown by a circle in crosshairs on the telescope
reticle.
If the target is smaller than the circle and there is
something highly reflective in the background, the
measured data may be affected by these adverse
conditions.
When an obstacle momentarily passes through the
beam between the instrument and the target (for example, passing cars on the road),
the false data (short distance) is deleted automatically. However, if the amount of
reflection is almost the same and the difference in distances between the correct and
the false data is less than two meters, it may cause an error in measurements.
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.
20
Field Station NPL-632 Instruction Manual
the angle of the laser against the target is small
the surface of the target is wet
Beam passing area
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