Vertex III and Transponder T3 manual v.1.5 eng
© 2007 Haglöf Sweden AB
10
Important Facts on your Vertex III Instrument
The Vertex III uses ultra sonic signals to determine distances. Humidity,
air pressure, surrounding noise and, above all, the temperature can
affect the range and extension of the ultra sonic signals. The Vertex III
has a built-in temperature sensor that automatically compensates for the
divergence caused by variations in temperature.
In some cases, distances of 50 meters/yds and greater can be measured
without problems, and in other cases, the maximum distance can be
shorter than 30 meters/yds.
To increase and optimize the measuring accuracy, the instrument should
be calibrated on a regular basis. When calibrating, it is of utmost
importance that the instrument has been given enough time to stabilize at
ambient temperature.
If, for example, the instrument is carried in an inner pocket, it can take up
to 10 minutes before it has adjusted to current outdoor temperature. The
measurement inaccuracy pending on temperature is app. 2 cm/C
.
An example
: Your inner pocket holds +15 C
/59F. Outdoor air
temperature is -5 C
/23F. The measurement result will show 10,40 m/34
ft and not the correct 10,00 m/32.8 ft.
The measuring fault can be made permanent if the instrument is
calibrated before reaching the correct current temperature.
-Check your instrument daily and recalibrate if necessary
-Do not touch the temperature sensor at the front of the instrument (the
metal knob between the sight and the loudspeaker)
-Never calibrate the instrument before it has reached ambient temperature
When measuring heights, it is important to hold the instrument as straight as possible.
Correct
Wrong
The trigonometric functions calculate the height based on two (2) angles
and one (1) distance. The distance can be measured manually with a
tape, or automatically by using the T3 transponder. If using a tape, the
distance has to be input in the Vertex before starting (angle-) and height
measuring.
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