Leica TS12P User Manual page 45

CAUTION
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ATR/lock
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TS12P, Operation
Due to laser safety regulations and measuring accuracy, using the Long Range Reflec-
torless EDM is only allowed to prisms that are more than 1000 m (3300 ft) away.
Accurate measurements to prisms should be made in IR mode.
When a distance measurement is triggered, the EDM measures to the object which is
in the beam path at that moment. If a temporary obstruction, for example a passing
vehicle, heavy rain, fog or snow is between the instrument and the point to be meas-
ured, the EDM may measure to the obstruction.
Do not measure with two instruments to the same target simultaneously to avoid
getting mixed return signals.
Instruments equipped with an ATR sensor permit automatic angle measurements to
prisms. The prism is sighted with the optical sight. After initiating a distance measure-
ment, the instrument sights the prism centre automatically. Vertical and horizontal
angles and the distance are measured to the centre of the prism. The lock mode
enables the instrument to follow a moving prism.
As with all other instrument errors, the collimation error of the automatic aiming must
be redetermined periodically. Refer to "5 Check & Adjust" about checking and
adjusting instruments.
When a measurement is triggered from the CS field controller while the prism is still
moving, distance and angle measurements may not be made for the same position
and coordinates may vary.
If the prism location is changed too quickly, the target may be lost. Make sure that the
speed does not exceed the figure given in the technical data.
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