Preparation - Leica MS50 User Manual

Summary of errors
to be adjusted
electronically
5.2
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Next Step
MS50/TS50/TM50, Check & Adjust
Instrument error
c - Line of sight error
a - Tilting axis error
l - Compensator index error -
t - Compensator index error 
i - Vertical index error
ATR Collimation error
Co-axial camera collimation
error

Preparation

Before determining the instrument errors, the instrument has to be
levelled using the electronic level.
The tribrach, the tripod and the underground should be stable and secure
from vibrations or other disturbances.
The instrument should be protected from direct sunlight to avoid thermal
warming.
It is also recommended to avoid strong heat shimmer and air turbulence.
The best conditions are early in the morning or with overcast sky.
Before starting to work, the instrument has to become acclimatised to the ambient
temperature. Approximately two minutes per °C of temperature difference from
storage to working environment, but at least 15 min, should be taken into account.
Even after adjustment of the ATR, the crosshairs may not be positioned exactly on the
centre of the prism after an ATR measurement has been completed. This outcome is
a normal effect. To speed up the ATR measurement, the telescope is normally not
positioned exactly on the centre of the prism. These small deviations/ATR offsets, are
calculated individually for each measurement and corrected electronically. This means
that the horizontal and vertical angles are corrected twice: first by the determined ATR
errors for Hz and V, and then by the individual small deviations of the current aiming.
IF the task is to
adjust a combination of
instrument errors
adjust the tilting axis
adjust the circular level
adjust the laser/optical
plummet
adjust the tripod
Effects Effects Elimination
Hz V with two face
measurement
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THEN
Refer to "5.3 Combined Adjustment (l, t, i, c, ATR and
tele camera)".
Refer to "5.4 Tilting Axis Adjustment (a)".
Refer to "5.5 Adjusting the Circular Level of the Instru-
ment and Tribrach".
Refer to "5.7 Inspecting the Laser Plummet of the
Instrument".
Refer to "5.8 Servicing the Tripod".
Automatically
corrected with
proper adjustment
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