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Laser Rangefinders I
Compass details
An electronic fluxgate compass is used to obtain magnetic azimuth
measurements. This compass works when the unit is tilted at up to 15°
to the horizontal. The compass is rated at ±0.5° under laboratory
conditions. In typical GIS data collection conditions, compass
accuracy is typically around ±1–2°. In environments where magnetic
interference is high (for example, in a vehicle), the compass can be
considerably less accurate.
Inclinometer details
A fluid tilt sensor measures vertical angles, which are used to calculate
the elevation of target points. The sensor is of a damped resistance
fluid type, and can take measurements up to ±60°, accurate to 0.1°.
Powering
The Criterion 300 and 400 rangefinders are powered by a rechargeable
9.6 V NiCd battery. This battery takes approximately 12–14 hours to
charge fully, and the rangefinder can be run for 7.5 hours or more on a
fully-charged battery.
Environmental limitations
The Criterion rangefinder can be used at temperatures ranging
between –30°C and +50°C (–22°F to +122°F). The laser casing is
resistant to light rain (but not immersion) and dust.
The Criterion rangefinder should be treated as precision optical
equipment, and should be handled with care. It withstands reasonable
drop shock, but alignment of the sighting scope should be checked
after dropping.
The rangefinder should always be transported in its hard carry-case.
TSC1 Asset Surveyor Operation Manual 309