Topcon GPT-2000 Manual De Usuario

2-5

   2 PREPARATION FOR MEASUREMENT

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.

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GPT-2000 compensates both the vertical angle and the horizontal angle readings due to inclination 
of the standing axis in the  X and Y  directions .

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For more information about dual axis compensation, refer to APPENDIX 1 “Dual Axis 
Compensation”.

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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.

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To 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

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