Trimble M3 Total Station User Manual

4 Getting Started in the Field
50 Trimble M3 Total Station User Guide
4.1 Focusing the telescope
C
WARNING – Never look at the sun through the telescope. If you do, you may damage or
lose your eyesight.
When you sight the instrument, you aim the telescope at
the target, bring the target image into focus, and align the
image with the center crosshairs of the reticle.
Note – In DR-mode, the center circle of the crosshair is the
beam passing area. The diameter is about 15 cm at 100 m
distance from the instrument.
To sight the instrument:
1. Adjust the diopter:
a. Aim the telescope at a blank area, such as the
sky or a piece of paper.
b. Looking through the eyepiece, rotate the
diopter ring until the reticle crosshairs are in
sharp focus.
2. Eliminate parallax:
a. Aim the telescope at the target image.
b. Rotate the focusing ring until the target image is in sharp focus on the
reticle crosshairs.
c. Move your eye vertically and laterally to check whether the target image
moves relative to the reticle crosshairs.
If the target image does not move, there is no parallax.
d. If the target image does move, rotate the telescope focusing ring. Then
repeat from Step c.
3. Rotate the tangent screw. The final turn of the tangent screw should be in a
clockwise direction, to align the target accurately on the center crosshairs.
Center
crosshairs
Diopter ring
Telescope
focusing ring

Trimble M3 Total Station Specifications

General

Brand	Trimble
Model	M3 Total Station
Category	Measuring Instruments
Language	English