Zoom20/30/35 Pro | 84Calibration
13.3 Calibrating Line-of-Sight and Vertical Index Error
Line-of-sight error The line-of-sight error, or horizontal collimation error is the deviation from the perpendicular between the
tilting axis and the line of sight. The effect of the line-of-sight error to the horizontal direction increases
with the vertical angle.
Vertical index error The vertical circle should read exactly 90° (100 gon) when the line of sight is horizontal. Any deviation
from this figure is termed vertical index error. This is a constant error that affects all vertical angle read-
ings.
Access 1) Select Tools from the MAIN MENU.
2) Select Calibr. from the TOOLS MENU.
• Select:
• HA-collimation, or
• Vertical Index.
The procedures and conditions required to correct line-of-sight and vertical index errors are the same,
therefore the procedure will only be described once.
Calibration step-by-step 1) Level the instrument with the electronic level. Refer to "4 Operation"- "Level up with the electronic
level step-by-step".
3 Press REC to measure to the target point.
5 Press REC to measure to the target point.
6Either:
• Press OK to save the new calibration data, or
• Press ESC to exit without saving the new calibration data.
a) Tilting axis
b) Line perpendicular to tilting axis
c) Horizontal collimation, or line-of-sight, error
d) Line-of-sight
a) Mechanical vertical axis of the instrument, also called standing axis
b) Axis perpendicular to the vertical axis. True 90°
c) Vertical angle is reading 90°
d) Vertical index error
By determining the vertical index error the electronic level is
adjusted automatically
b
c
d
a
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2 Aim at a point approximately 100 m from the instrument
which is within 5° of the horizontal.
4 Change face and aim at the target point again
For checking the horizontal aim, the difference in HA and VA are displayed.
The old and new calculated values are displayed.
± 5°
~ 100 m
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180°
180°
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