Sokkia 30R Series Operator's Manual page 124

24. CHANGING THE SETTINGS
Automatic tilt angle compensation mechanism
The vertical and horizontal angles are automatically compensated for small
tilt errors using the 2-axis tilt sensor.
• Read the automatically compensated angles when the display has
stabilized.
• The horizontal angle error (vertical axis error) fluctuates according to the
vertical axis, so when the instrument is not completely leveled, changing
the vertical angle by rotating the telescope will cause the displayed
horizontal angle value to change.
Compensated horizontal angle = Measured horizontal angle + Tilt in angle
/ tan (Vertical angle)
• When the telescope is directed close to the zenith or nadir angle, tilt
compensation is not applied to the horizontal angle.
Collimation correction
The SET has a collimation correction function that automatically corrects
horizontal angle errors caused by horizontal axis and leveling axis errors.
V obs. (vertical angle display method)
Zenith
Select "Instr. Config" in Config mode
• "Guide pattern" is displayed only when the guide light option is selected.
116
Horiz
Guide pattern
Horiz 90°
10
Hold
: 1