Leica Geosystems TPS110C - Manual (Page 62)

Checking and Adjusting 62
Laser Plummet, continued
Inspecting the laser plummet
should be carried out on a
bright, smooth and horizonal
surface (e.g. a sheet of paper).
If the centre of the laser spot
makes a clear circular
movement or if the centre of the
point is moving away more than
1mm from the first marked point
an adjustment is possibly
necessary. Call your nearest
Leica service department.
Depending on brightness and
surface the size of the laser
spot can vary. At a distance of
1.5 m an average value of 2.5
mm diameter must be
estimated.
The maximum diameter of the
circular movement of the centre
of the laser spot should not
exceed +/- 0.8 mm at a distance
of 1.5 m.
Reflectorless EDM
The red laser beam used for
measuring without reflector is
arranged coaxially with the line
of sight of the telescope, and
emerges from the objective port.
If the instrument is well
adjusted, the red measuring
beam will coincide with the
visual line of sight. External
influences such as shock or
large temperature fluctuations
can displace the red measuring
beam relative to the line of sight.
The direction of the
beam should be
inspected before precise
measurement of distances is
attempted, because an
excessive deviation of the laser
beam from the line of sight can
result in imprecise distance
measurements.