Haglof VERTEX LASER GEO2 Technical Manual page 29

Revision: 1
5.3 DISTANCE MEASURING USING
ULTRASOUND
1. Shut down the VL GEO2.
2. To activate the T4 transponder, place the
ultrasonic transceiver on the VL GEO2 device near
the middle of the transponder and push the DME
button on the VL GEO. Listen for two short beeps
from the transponder. The T4 transponder is now
ON and will remain ON until you deactivate it or it
turns off automatically after about 20 minutes of
no activity. To deactivate the T4 transponder
(OFF), follow the same steps as above and wait for
four (4) short beeps.
You can put the T4 transponder on the monopod
staff in the center of a plot (up to 20 meters or
better accuracy) or attach it to a tree trunk (up to
30 meters or better accuracy).
3. Push the DME button to measure the distance to
the transponder. The result is shown on the
display. If the BAF function is on, the Ø min
diameter is calculated and displayed (pic 2).
!
Note that you can also use the laser in this
menu, aim and press ON to measure with laser.
© 2024, Haglöf Sweden AB
Vertex Laser Geo2 & Laser Geo2
4. Do point 3 again to measure more distances.
Press both the DME and SEND buttons to shut down the VL
GEO2 device.
The speed of ultrasonic pulses varies depending on the
weather conditions, air pressure and other factors. With no
obstacles between the instrument and the transponder in
open terrain, ultrasound and the T4 transponder can
sometimes measure distances up to 40 meters.
The ultrasound needs to be calibrated at the same
temperature as the air. The VL GEO2 has a sensor that will
adjust for changes in the temperature. For best measuring
accuracy, it is advised to check and calibrate the instrument
regularly, and ideally daily.
DISTANCE MEASURING USING ULTRASOUND
28
2024-04-30