SHANGHAI ESURVEY GNSS CO., LTD.
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The conversion formula for horizontal and vertical distance is as follows when correction
for refraction and earth curvature is not applied:
HD = SD * COSξ
VD = SD * |SIN|ξ
Note: The factory setting for the refraction coefficient K is 0.142.
8.3 Assembling and Disassembling for the Three-jaw Tribrach
It is convenient to assemble or disassemble the instrument from the tribrach by loosening
or tightening the tribrach clamp.
Disassemble
1. Rotate the tribrach clamp anticlockwise until the lever is loosened.
2. One hand hold up the tribrach, another hand hold the handle of the instrument and
lift out the instrument from the tribrach.
Assemble
1. Lightly put the instrument into the tribrach, and let the communication port against in
the indentation of the tribrach.
2. Rotate the tribrach clamp clockwise until the lever is tightened.
Fix the tribrach clamp
Note: If there is no need to frequently assemble or disassemble the instrument from
the tribrach, it is necessary to fix the tribrach clamp by the fixed screw to avoid the
disassembly by accident.
To fix the clamp, screw out the fixed screw by the screwdriver.
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