Topcon DT-209P User Manual

40
8.4 Collimation of the Instrument
Collimation is required to make the line of sight of the telescope perpendicu-
lar to the horizontal axis of the instrument, otherwise, it will not be possible to
extend a straight line by direct means.
●
Check
ing
1
Set the instrument up with
clear sights of about 50 to
60meters
(160 to 200 ft.) on both
sides of the instrument.
2
Level the instrument
properly with the plate
level.
3
Sight Point A at
approximately 50 meters
(160 ft.) distance.
4
Loosen the vertical
motion clamp only, and
rotate the telescope 180°
or 200g around the
horizontal axis, so that the
telescope is pointed in the
opposite direction.
5
Sight Point B, at equal
distance as Point A and
tighten the vertical motion
clamp.
6
Loosen the horizontal
motion clamp and rotate
the instrument 180° or
200g around the vertical
axis. Fix a sight on Point
A once more and tighten
the horizontal motion
clamp.
7
Loosen the vertical
motion clamp only and
rotate the telescope 180°
or 200g around the horizontal axis once more and fix a sight on
Point C, which should coincide with previous Point B.
8
If Points B and C do not coincide, adjust in the following manner.
50
50
50
50
Eyepiece
Tele scop e

Topcon DT-209P Specifications

General

Brand	Topcon
Model	DT-209P
Category	Laser Level
Language	English