Hi-Target HTS-420R, Manual, Page: 25 / 192

Total Station Manual
- 24 -

When start the distance measurement, EDM will measure distance for the object
in the light path.If there are temporary obstacles in the light path (such as by car,
or the heavy rain, snow, or filled with fog), the distance measured by EDM is the
distance to the nearest obstacle.

When a long distance measurement, laser beam deviation of collimation line will
affect the accuracy of measurement.This is because the divergence of the laser
beam reflection point may not be with the crosshair sighting points coincide. It is
recommended that the user accurately adjust to ensure that is consistent with
laser beam collimation.
（
Please refer to
“
20.10 NO Prism Ranging
”
in the
Chapter 9
）

Don't use two instruments to measure the same target at the same time .

Red light cooperates with reflective pieces to measure distance
Laster can also be used to measure distance for eflectivepieces.To guarantee the
accuracy of measurement, the laser beam is perpendicular to the reflector plate,
and through accurate adjustment.
（
Please refer to
“
3.10 NO Prism Ranging
”
in
the Chapter 9
）
Ensure proper additive constant of different reflection prism.