Check & Adjust; Overview; Preparation - Leica FlexLine plus User Manual

14
14.1
Description
Electronic
adjustment

Mechanical
adjustment

14.2



FlexLine plus, Check & Adjust
Check & Adjust

Overview

Leica Geosystems instruments are manufactured, assembled and adjusted to the best
possible quality. Quick temperature changes, shock or stress can cause deviations and
decrease the instrument accuracy. It is therefore recommended to check and adjust
the instrument from time to time. This check and adjust can be done in the field by
running through specific measurement procedures. The procedures are guided and
must be followed carefully and precisely as described in the following chapters. Some
other instrument errors and mechanical parts can be adjusted mechanically.
The following instrument errors can be checked and adjusted electronically:
• Horizontal collimation error, also called line-of-sight error.
• Vertical index error, and simultaneously the electronic level.
• Compensator longitudinal and transversal index errors
• Tilting axis error.
For determining these errors, it is necessary to measure in both faces, but the proce-
dure can be started in any face.
The following instrument parts can be adjusted mechanically:
• Circular level on the instrument and tribrach.
• Laser plummet.
• Screws on the tripod.
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).

Preparation

Before determining the instrument errors, level-up the instrument using
the electronic level. The Level & Plummet is the first screen to appear after
turning on the instrument.
The tribrach, the tripod and the ground should be very 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 environment, but at least 15 min, should be taken into account.
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