14
Vertical Angle
If vertical angle is 0° in horizontal direction, then, the vertical angle measured in this way
is the perpendicular angle.
Note: If index difference ‘I’ ≥ 10”, adjustment should be made as 8.6.
Gradient percentage
The vertical angle can be converted into gradient percentage in angle measurement
mode.
The range of gradient is from horizontal direction to ±45° (except 45°). Otherwise the
instrument will not display the grade percentage.
Method: Press until two beeps, the display panel shows vertical angle or gradient
percentage alternately.
Zenith (90° 00’ 00”)
Horizontal direction (00° 00’ 00”)
Vertical Angle: Q = (L+180°-R) /2
Index difference: I = (L+R-180°) /2
or I = (L+R-540°) /2
Target 1
Q
Gradient percentage value = tg a * 100%
= H/D * 100%
H
S
D
a
