User guide

Trimble M3 Total Station User Guide 53
Getting Started in the Field 4
Sighting a prism in Direct-Reflex mode may cause an
excessive signal error. In this case, change the prism
mode to PR - press and then press
[2].
In the Direct-Reflex mode, the beam passing area is
shown by a circle in crosshairs on the telescope reticle.
If the target is smaller than the circle and there is
something highly reflective in the background, the
measured data may be affected by these adverse
conditions.
When an obstacle momentarily passes through the
beam between the instrument and the target (for
example, passing cars on the road), the false data (short
distance) is deleted automatically. However, if the amount of reflection is almost the
same and the difference in distances between the correct and the false data is less than
two meters, it may cause an error in measurements.
Make sure there are no obstacles between the instrument and the target when taking
measurements. When you need to take measurements across a road or a place where
vehicles or other objects are frequently moving, take several measurements to a target
for the best result.
4.2 Turning the instrument on and off
42.1 Turning on the instrument
1. To turn on the instrument, press [PWR]. The
start-up screen appears. This screen shows the
version of the program.
2. When you tilt the telescope, current settings of
temperature, pressure, prism constant, and scale
appear for about two seconds.
3. The
Rec Current Settings screen
appears. Do one of the following:
– To skip recording the current instrument
settings, press
[F1] No.
Beam passing area