Stonex R60 – User Manual 30
5. Calibration
5.1. About Calibration
Some errors checking and calibration operations can be carried out by the user by running calibration
procedures. These procedures need to be carried out carefully and correctly. The detailed procedure is
described in the following sections.
The instrument is factory calibrated to exacting specifications, but rapid temperature changes, vibrations
or impacts may cause unexpected deviations and a reduction in the accuracy. The user is advised to
check and calibrate the instrument frequently.
In the following cases it is highly recommended to check the instrument:
• Before using the instrument for the first time
• Before each high-precision measurement operation
• After a bumpy or long transport
• After long periods of storage
• After a violent and accidental impact or after falling over
• The difference between the current temperature and the temperature at the time of the last
calibration is greater than 10°
In addition to the instrument errors described in this section, some other errors can be calibrated by
professional operation. But the calibration process must be carried out either at the factory or an
authorised workshop by specialist staff with specialist equipment. Any self-adjustment or calibration will
result in unpredictable instrument failure or accuracy problems.
Note. Before calibrating the instrument error, the instrument must be precisely levelled following the
electronic level. The relationship between the tribrach, tripod and the ground must be stable and avoid
any vibration and impact throughout the procedure. The instrument must be acclimatised to the ambient
temperature before the calibration. During the whole procedure, the instrument must be protected from
direct sunlight which can cause overheating on one side of the instrument.
5.2. HA calibration
The HA calibration is a procedure necessary for calibrating HA angle, reducing HZ-collimation error. HZ-
collimation error is an error due to the fact that the telescope axis of the instrument is not perpendicular
to telescope horizontal rotation axis. In the plane formed by telescope axis and the telescope horizontal
rotation axis, the angle between the perpendicular line of the telescope horizontal rotation axis through
the centre of the instrument and the telescope axis is the HZ-collimation Error.
Determine the HZ-collimation error
1. Set up the tripod and instrument stable.
2. Power on the instrument. Precisely level the instrument.
3. In Face 1, accurately aim at a target about 100m away whose height was similar as the instrument.
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