Velleman VTUSD Manuel D'utilisation page 5

To overcome reading errors in long narrow or other confined spaces readings in each direction may be added
together to give the overall dimensions as shown in fig. 5 and 6.
SUM SEQUENTIAL
ADDITION OPERATION
This function is used to add sequential measurements together to give a final combined reading/measurement. For
example, if the length of the room to be measured exceeds the maximum capacity of this unit, i.e. 14.5 metres, set
the VTUSD at a fixed point in the room (see fig. 5 and 6) and take a reading in both directions using the 'SUM' key
pad to quickly add both readings giving the overall length of the room.
HOW TO USE THE CLR SUM KEY
1. Press CLR SUM to clear any previous sequential additions in memory.
2. Press ON
3. Make the first distance measurement (e.g. 1 metre)
4. Press SUM.
5. Press ON
6. Make the second distance measurement (e.g. 2 metres)
7. Press SUM.
8. The unit will have automatically combined the two distance measurements and will give a combined reading of
both (e.g. 1 metre + 2 metres = 3 metres)
AREA CALCULATIONS
This function is used to calculate areas very quickly.
VTUSD VELLEMAN
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