LEICA TPS1200 - Manual (Page 88)

88 TPS1200 Operation
)
Do not measure with two instruments to the same target simultaneously to avoid
getting mixed return signals.
ATR/lock Instruments equipped with an ATR sensor permit automatic angle and distance
measurements to prisms. The prism is sighted with the optical sight. After initiating
a distance measurement, 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 target recog-
nition must be redetermined periodically. Refer to "5 Check & Adjust" about checking
and adjusting instruments.
)
When a measurement is triggered while the prism is still moving, distance and angle
measurements may not be made for the same position and wrong coordinates may
be calculated.
)
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.