Velleman VTUSD3 - Manual (Page 3)

VTUSD3 VELLEMAN - 3 -
• Open the battery cover at the back of the meter using an appropriate Phillips-head screwdriver. You may need to
remove the belt clip.
• Remove the old battery and insert a new one.
• Close the battery cover and slide the belt clip into place.
5. Use
• Activating/Deactivating the Meter
Press the on/off key to activate or to deactivate the meter. The device is sensitive to changes in temperature and
humidity. Wait ± 15 minutes and let the device reach room temperature prior to use. Note that the backlight will
automatically switch off after ± 5 seconds. The meter itself will automatically switch off after ± 1 minute of inactivity.
• Measuring Distance
Select the measurement mode. Use the Fm measurement mode when measuring distance from where you are
standing. Use the Bm measurement mode to measure distance from wall to wall. To do so, press the Fm/Bm key,
place the back of the meter against the wall and press the READ key.
• Calculating an Area
This function can be used to measure the surface area of a room. Press the area measurement key. Measure the
length of the room first (displayed upper value). Now, measure the width of the room. The surface area will appear as
the lower value (in m² or ft²).
• Calculating a Volume
This function can be used to measure the volume of a room. Press the volume measurement key. Measure the
length of the room first (displayed upper value). Now, measure the width of the room (displayed upper value). Finally,
measure the height of the room. The volume will appear as the lower value (in m³ or ft³).
• Adding Up Distances
This function can be used to add different measured distances. Press the addition key first and measure your
different distances. The meter will add the distance to the previous value as you measure. Note that the maximum
distance is 100m or 100ft.
• Storing Measurements
This meter has 5 memory sets. Measure a distance, surface area or volume and press STORE. Note that a value
cannot be overwritten when all sets are occupied. Erase the memory first by holding the ESC/CLEAR key pressed for
a few seconds.
• Recalling Stored Data
Press the RECALL key. Note that when recalling a surface area or a volume all distances have been memorized
separately. Press several times to recall the length, the width and the height separately.
• Clearing Data
Press ESC/CLEAR to clear the read out. Hold ESC/CLEAR pressed for 3 seconds to clear the memory.
6. Remarks
• For accurate results, choose a surface which is flat and as large as possible. Note that this distance meter cannot
measure the distance of an object through glass although the laser will reach the object to be measured. Measuring is
done through ultrasonic waves and not through the laser.
• Air flows can affect the read out when measuring a distance than 12m.
• Temperature and humidity can affect the speed of sound. Therefore, respect the environmental conditions (see
“Technical Specifications”).
• Choose your measurement units (metre or feet) prior to measuring or calculating.
• NEVER POINT THE LASER AT EYES.