Check & Adjust; Overview; Preparation - Leica LS10 User Manual

14
14.1
Description

Electronic
Adjustment
Mechanical
Adjustment
14.2



LS10/LS15, 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.
During the manufacturing process, the instrument errors are carefully determined and
set to zero. These errors can change and it is highly recommended to determine them
again for any of the following situations:
• Before the instrument is used for the first time.
• Before every high precision levelling task.
• After rough or long periods of transport.
• After long periods of work or storage.
• If the temperature difference between current environment and the temperature
during the last calibration is more than 10°C (18°F).
You can carry out the following electronic adjustment tasks:
• Correcting the collimation error, also called line-of-sight error (refer to "14.3
Adjusting Line-of-Sight Error").
• Aligning the camera crosshair (refer to "14.5 Aligning the Camera Crosshair").
• Calibrating the digital compass (refer to "14.6 Calibrating the Digital Compass").
• Adjusting the electronic level (refer to "14.8 Adjusting the Electronic Level").
You can adjust the following instrument parts mechanically:
• Circular level of the instrument (refer to "14.7 Adjusting the Circular Level of the
Instrument").
• Optical crosshair (refer to "14.4 Adjusting the Optical Crosshair").
• Screws on the tripod (refer to"14.9 Servicing the Tripod").

Preparation

Before determining the instrument errors, level-up the instrument using
the circular level and if available, the electronic level. Ensure, that the
circular level is adjusted (refer to "14.7 Adjusting the Circular Level of the
Instrument").
The tribrach, the tripod and the ground should be very stable and secure
from vibrations or other disturbances.
During the calibration, protect the instrument and if possible also the
staffs from direct sunlight in order to avoid uneven 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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