Topcon AT-B4 User Manual

6. OPERATION
15
The horizontal circle graduations are annotated every
10° (360°) or 10 gon (400 gon) in a clockwise direction.
As a result, sighting is performed from left to right.
1 Use the plumb bob to set up the instrument directly
above the survey point.
2 Sight point A, and set the horizontal circle to 0° by
turning the horizontal circle positioning ring.
3 Sight point B and take the angle reading.
Example: 91.5° (or 91.5 gon) in the figure below.
6.2 MEASURING HORIZONTAL ANGLE

Topcon AT-B4 Specifications

General

Brand	Topcon
Model	AT-B4
Category	Tools
Language	English