2 PREPARATION FOR MEASUREMENT
2-6
2.6 Vertical and Horizontal Angle Tilt Correction
When the tilt sensors are activated, automatic correction of vertical and horizontal angle for mislevel-
ment is displayed.
To ensure a precise angle measurement, tilt sensors must be turned on. The display can also be
used to fine level the instrument. If the (TILT OVER) display appears the instrument is out of auto-
matic compensation range and must be leveled manually.
V
W X
S
P
O
T
Q
D
U
R
|
Standing axis
Zenith
Inclination of the standing
axis in the X direction
Standing axis
Zenith
Inclination of the standing
axis in the Y direction
Tr u nnion axis
Horizontal
• GPT-8000A/8000 series compensates both the vertical angle and the horizontal angle
readings due to inclination of the standing axis in the X and Y directions.
• For more information about dual axis compensation, see Chapter “APPENDIX” “Dual Axis
Compensation”.
• The display of Vertical or Horizontal angle is unstable when instrument is on an unstable
stage or a windy day. You can turn off the auto tilt correction function of V/H angle in this case. To
set TILT correction mode ON/OFF, refer to next page or Chapter 8 “PARAMETERS SETTING
MODE”.
When the instrument tilted over correction
range.
X:
Y:
X:00°00'00"
Y:00°00'00"
Rotate the leveling screws and level the
instrument.
After leveling (when each axis is within ±1'30"),
the display returns to the previous mode
automatically.
X,Y tilt correction range : within ±4'
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