Topcon AP-L1A - Vertical and Horizontal Angle Tilt Correction

2. PREPARATION FOR MEASUREMENT
2-5
2.5 Vertical and Horizontal Angle Tilt Correction
When the tilt sensors (dual) are activated, automatic correction of horizontal and vertical 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.
 Rotate the leveling screws and manually level the
instrument. When the vertical axis tilt is within  30"
, the display changes to the previous mode after
display holds tilt correction for about 2 seconds.
When AP-L1A tilted over correction
range.(TILT OVER)
V :  ' "
HR :  ' "
 TILT OVER 
About3seconds
TILT
X :  OVER! 
Y : 0 01' 41"
[ON] [OFF]
TILT [ON]
X : -0 00' 25"
Y : 0 00' 0"
[ON] [OFF]
 Pressing [F2] key to answer OFF, automatic tilt correction is canceled, and returns to the
previous mode. It does not memorized this setting after power OFF.
To set auto tilt correction from the moment that power is on, refer to chapter 16." Selecting
Mode".
 The display of Vertical or Horizontal angles is unstable when instrument is on an unstable
stage or in a windy day. You can turn off the auto tilt correction function of H/V angle in this
case.
 If the instrument is not precisely leveled, the tilt correction on the angle data may include errors
during the rotation. (Though the tilt sensor properly corrects angle readings if the rotation is
completed and the instrument is in stationary condition.)
If the instrument is precisely leveled, however, the tilt sensor properly corrects angle readings
even during the rotation. Therefore, when accuracy is required during the rotation, level the
instrument as precise as possible.
 Setting Tilt Correction by Soft Key.
Enable to select tilt ON/OFF function.
[Example] Setting V/H Tilt ON
Operating procedure Operating key Display
 Press [F4] 2 times to open function
page 3.
[F4]
Press twice
V: 80 10 '20"
HR : 120 30' 40"
0SET HSET R/L 1
TILT m/f    3