Viva Series, TPS Functions 686
33.3 Follow Moving Prisms - Lock
Description Lock enables instruments equipped with automatic aiming to follow a moving prism. The
automatic aiming sensor is active when Lock is active. When Target lock on is selected in
Leica TPS Favourites, an automatic aiming search is executed. The instrument locks onto
the prism and follows its movements. Automatic aiming offsets are continuously applied to
the angle measurements. When the instrument loses lock to the prism, a PowerSearch or
fine search (auto aiming search) can be executed depending on the prism search settings.
Lock is unavailable for SmartStation.
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If the speed of the prism is too fast, the target may be lost. Make sure that the speed does
not exceed the figure given in the technical data.
Enable lock Selecting Target lock on in Leica TPS Favourites, will immediately activate an automatic
aiming search to find the prism. Alternatively, as long as Target aiming is set to Lock in
Measure & Target Settings, then pressing Meas, Dist, PowerSearch right, OK in Check
Point, Joystick, Turn to Hz/V and Orientation With Compass will start a PowerSearch or
automatic aiming search to find the prism. When the prism is found, the instrument locks
onto the prism. The instrument follows the moving prism and the automatic aiming function
remains active.
Loss of lock When the instrument is locked onto a prism, lock may be lost if the movement of the prism
is too fast for the instrument to follow or the prism is hidden behind an object. After lock is
lost, the prediction, as set in Prism Search Settings is used to find the prism again.
The automatic aiming function is still active.
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Whenever the prism is moved in the field of view during the prediction and any other search
periods, the instrument locks automatically to the prism.
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