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5
5.1
Description
Electronic adjustment
Checking parts
Precise
measurements
☞
38
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 recom-
mended 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 pro-
cedures. The procedures are guided and must be followed carefully and pre-
cisely 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:
Instrument error
l, t
i
c
a
If the compensator and the horizontal corrections are activated in the instru-
ment configuration, every angle measured in the daily work is corrected auto-
matically. Check whether the tilt correction and the horizontal correction are
turned on.
The results are displayed as errors but used with the opposite sign as correc-
tions when applied to measurements.
The following instrument parts can be checked:
•
Circular level on the instrument and tribrach.
Laser plummet.
•
Screws on the tripod.
•
To get precise measurements in the daily work, it is important:
•
To check and adjust the instrument from time to time.
To take high precision measurements during the check and adjust proce-
•
dures.
To measure targets in two faces. Some of the instrument errors are elimi-
•
nated by averaging the angles from both faces.
During the manufacturing process, the instrument errors are carefully deter-
mined 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 tem-
•
perature at the last calibration is more than 10°C (18°F).
Description
Compensator longitudinal and transversal index
errors
Vertical index error, related to the standing axis
Horizontal collimation error, also called line of
sight error
Tilting axis error
Check & Adjust
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