12 Check & Adjust
12.1 Overview
GeoMax instruments are manufactured, assembled and adjusted to a high quality. Quick temper-
ature changes, shock or stress can cause deviations and decrease the instrument accuracy. It is
therefore recommended to calibrate the instrument from time to time. This can be done in the
field by running through specific measurement procedures. The procedures are guided and have
to be followed carefully and precisely as described in the following chapters. Some other instru-
ment errors and mechanical parts can be adjusted mechanically.
During the manufacturing process, the instrument errors are carefully determined and set to
zero. As mentioned, these errors can change and it is highly recommended to redetermine them
in the following situations:
•
Before the instrument is used for the first time.
•
Before every high precision survey.
•
After rough or long periods of transport.
•
After long periods of work or storage.
•
If the temperature difference between current environment and the temperature at the last
calibration is more than 10°C (18°F).
For determining these errors, it is necessary to measure in both faces, but the procedure can be
started in any face.
12.2 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 in
order to avoid thermal expansion on one side only.
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 environ-
ment, but at least 15 min, should be taken into account.
12.3 Adjustments
1. Select Tools from the Main Menu.
2. Select Adjust from the Tools menu.
3. To select an option in the Adjust menu, press a function key, F1 - F4.
To toggle through the available screens, press the PAGE key.
Menu selection Description
View Adjust
Param.
Displays the current value of vertical index error and the parameters of tilt
sensor.
Adjust Index
Error
Refer to "12.4 Adjust Index Error".
Adjust Tilt X Refer to "12.5 Adjust Tilt X / Tilt Y".
Adjust Tilt Y Refer to "12.5 Adjust Tilt X / Tilt Y".
Description
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Access
Adjust menu
90 Check & Adjust
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