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2-5
2 PREPARATION FOR MEASUREMENT
2.5 Vertical and Horizontal Angle Tilt Correction
(GPT-3107N has vertical angle tilt correction only.)
When the tilt sensors are activated, automatic correction of vertical and horizontal angle for
mislevelment 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 automatic
compensation range and must be leveled manually.
zGPT-3100N compensates both the vertical angle and the horizontal angle readings due to
inclination of the standing axis in the X and Y directions .
zFor more information about dual axis compensation, refer to APPENDIX 1 “Dual Axis
Compensation”.
zThe 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.
zTo set auto tilt correction from the moment that power is on, see Section 6.4.3 “Vertical and
Horizontal Angle Tilt correction (Tilt ON/OFF)”.
Zenith
Standing axis Inclination of the standing
axis in the X direction
Zenith
Inclination of the standing
axis in the Y direction
Trunnion axis
Horizontal
Standing axis
V : ° ' "
HR: ° ' "
<X TILT OVER>
V : ° ' "
HR: ° ' "
<Y TILT OVER>
V : ° ' "
HR: ° ' "
<XY TILT OVER>
When the instrument is out of compensation. (TILT OVER)
Standing Axis in the X direction
out of range
Standing Axis in the Y direction
out of range
Standing Axis in the X and Y
directions out of range
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