MS60/TS60, Check & Adjust
55
Summary of Errors
to be Adjusted
Electronically
5.2 Preparation
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 ATRplus, the crosshairs may not be positioned exactly on
the centre of the prism after an ATRplus measurement has been completed. This
outcome is a normal effect. To speed up the ATRplus measurement, the telescope is
normally not positioned exactly on the centre of the prism. These small devia-
tions/ATRplus 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 ATRplus errors for Hz and V, and then by the individual small
deviations of the current aiming.
Next Step
Instrument error Effects
Hz
Effects V Elimination
with two face
measurement
Automati-
cally
corrected
with proper
adjustment
c - Line of sight error -
a - Tilting axis error -
l - Compensator index error -
t - Compensator index error -
i - Vertical index error -
ATRplus Collimation error -
Co-axial camera collimation
error
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.
IF the task is to THEN
adjust a combination of
instrument errors
Refer to "5.3 Combined Adjustment (l, t, i, c, ATRplus
and Telescope Camera)".
adjust the tilting axis Refer to "5.4 Tilting Axis Adjustment (a)".
adjust the circular level Refer to "5.5 Adjusting the Circular Level of the Instru-
ment and Tribrach".
adjust the laser/optical
plummet
Refer to "5.7 Inspecting the Laser Plummet of the
Instrument".
adjust the tripod Refer to "5.8 Servicing the Tripod".
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