LTI TruPoint 200h User’s Manual • Section 1 - Introducing the LTI TruPoint™ 200h
Page 7
Copyright (c)[2020] Laser Technology, Inc. All Rights Reserved. Unauthorized duplication, in whole or in part is strictly prohibited.
Understanding How the TruPoint 200h Works
The TruPoint 200h consists of two laser range sensors, an integrated tilt sensor, and a digital
processor. The TruPoint 200h navigation buttons access and control the unit's internal
user interface.
Laser Range Sensor
Pulse Laser
: The laser range sensor emits invisible, eye safe, pulses of infrared light energy.
The TruPoint 200h determines distance by measuring the time it takes for each pulse to travel
from the rangefinder to the target, and back. The indicator is displayed whenever the laser is being
transmitted. The laser may be active for a maximum of 10 seconds. The TruPoint 200h has a broad
spectrum of sensitivity and can work with both reflective and non-reflective targets. See TruTargeting
(below) for information about high quality and low-quality targets.
Phase
Laser
: The laser diode emits light pulses with a defined wavelength and pulse repetition
frequency. Due to the runtime difference between the internal reference path and the external
measurement path, the light pulses, reflected on a target and received from the TruPoint 200h,
have experienced a phase shift in relation to the light pulses received through the internal reference
path. That phase difference between those two signals is proportional to the distance between
instrument and target.
Targets
When selecting a target, you should consider the following:
•
Color:
The brighter the color, the longer the range.
•
Finish:
Shiny finishes provide longer range than dull finishes.
•
Angle:
Shooting perpendicular to a target provides better range than
shooting to a target at a sharp angle.
•
Lighting Conditions:
Overcast skies will increase the unit's maximum
range, and sunny skies will decrease the unit's maximum range.
TruTargeting
The TruPoint 200h automatically provides the best accuracy and acquisition distance to a given
target. Maximum measurement distance varies with target quality and environmental conditions.
Target quality influences the precision of measurements.
Tilt Sensor
The integrated tilt sensor measures vertical angles that the TruPoint 200h uses to calculate
height and elevation and to determine slope-reduced horizontal distances. The instrument held
level is at 0° and is rotated up t90° and down through -90°.
Target quality can be affected by atmospheric conditions, such as heat shimmer,
dust, target reflectance, traverse angle to target, and beam spread.
**Draft B**
