Product Manual

62
which eliminates the need to measure in both instrument
faces.
Carry out a collimation test in the following situations:
• Whenever the instrument may have been roughly handled
during transport.
• When the ambient temperature differs by more than 10 °C
(18 °F) from the previous collimation test.
• Immediately prior to high precision angle measurements in
one face.
FOCUS 50 Total Station With Autolock technology
A FOCUS 50 total station with Autolock technology can
automatically lock on to and track a prism. Pointing errors
caused by slight misalignment of the instruments tracker have
a similar effect to the HA and VA Collimation errors detailed
above.
To correct for the tracker collimation errors, carry out an
Autolock collimation test. The Autolock collimation test
automatically observes angular measurements to a target in
both faces, the tracker collimation errors are calculated and
the respective correction values are stored in the instrument.
The Autolock collimation correction values are then applied to
all subsequent angle measurements observed when Autolock
is enabled. Angles observed in a single face are corrected for
collimation errors, which removes the need to measure in both
instrument faces.
Carry out an Autolock collimation test in the following
situations:
• Whenever the instrument may have been roughly handled
during transport.
• When the ambient temperature differs by more than 10 °C
(18 °F) from the previous collimation test.
• Immediately prior to high precision angle measurements
using Autolock in a single face.
Correction for Trunnion Axis Tilt
The trunnion axis tilt error is the deviation of the trunnion axis
of the telescope from its required position at right angles to
the plumb axis of the instrument.