SLT12 User Manual
200
● The vertical wire of the instrument should be used for orientation, strictly so that the three
points A, B, and C are in the same straight line. the ground at point B should have a firm and
clear alignment mark.
● Whether the center of the prism at point B coincides with the center of the instrument is an
important part of ensuring detection accuracy, therefore, it is best to use a tripod at point B
and a base that can be used for both, such as a three-jaw prism connector and base
interchange, the tripod and base remain fixed, and only change the prism and instrument
above the base part, which can reduce the non-coincidence error.
17.9 The parallelism between the Axis of Visual Alignment and the
Axis of Emitting Electric Light
17.9.1 Check
1. Place the reflecting prism 50 meters from the instrument.
2. Use the telescope cross wire to precisely aim at the center of the reflecting prism.
3. Check whether the center of the telescope cross filament and the transmitting
electro-optical axis alignment center coincide, such as the basic coincidence can be
considered qualified.
17.9.2 Adjust
If the center of the telescope cross wire and the center of the transmitting electro-optical axis
deviates greatly, it must be sent to the professional repair department for correction.
17.10
Non-prism Distance Measurement
The red laser beam, which is co-axial with the telescope and used for Non-prism distance
measurement, is emitted from the telescope. If the instrument is well calibrated, the red laser
beam will coincide with the line of sight. External influences such as vibrations, large
temperature changes, etc. can cause the laser beam to not coincide with the line of sight.
● Before precision distance measurement, the directional coaxially of the laser beam should
be checked for any offset, otherwise it may lead to inaccurate distance measurement.
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