ARVA 3 Axes Mode D'emploi page 11

Les langues disponibles

advanced (analogue) mode

Diagrams E1 and E2.

When the ARVA is switched to advanced mode, its sensitivity is maximum (level 9). However, the Advanced symbol

flashes if the sensitivity level is to be reduced. Decrease the sensitivity with the

stops flashing. When the symbol stops flashing, you can use the numbers, which give an estimation of the distance

that still needs to be covered.

■ Initial search

Moving forward, turn the device in every direction until the first audible signal is heard. If the signal is weak, continue

to move in the same direction without changing the position of the device until the sound is clearer and sufficiently

distinct to be of help. The initial search is over when a clear signal is obtained.

■ Secondary search (cross or directional search) There are two possibilities:

• Cross technique Diagram E1:

As you move forward, keep the ARVA in the same position. It must be moved parallel to itself. When the first signal

is obtained, keep moving in a straight line. The beep becomes louder and the distance indicator decreases. Once the

maximum signal has been reached and starts to diminish, return to the approximate point where it was strongest.

Reduce the sensitivity to minimum in order to detect the point where the beep will be loudest, and start moving in a

line perpendicular to the previous direction. You will soon realise if you are moving in the right direction, as the signal

will quickly become louder, or in the wrong direction, in which case it will diminish. Once again, find the point where

the beep is loudest, as previously. Continue until the sensitivity is positioned on one of the two last levels (minimum

sensitivity, and therefore minimum search distance).

• Directional method Diagram E2:

To determine the direction to follow, sweep the ARVA from left to right over 180°, holding it horizontally. The stronger

the signal, the louder the beep will be (and the lower the distance indicator). The right direction is the one in which

the beep is the loudest. If the beep gets louder as you move forward, you are going in the right direction. If it gets

weaker, you are going in the wrong direction. Turn round, walk back a few metres and check again to find the right

direction. As you advance, turn down the sound level with the

ARVA is emitting the loudest beep). When the sensitivity is down to 2 or 1, the secondary search is finished.

■ Final search

You are very close to the victim when the sensitivity is down to 2 or 1 (the actual level depends on the depth at

which the victim is buried). The cross technique should then be used (see opposite). Remember that in this case the

distance indication is replaced by the intensity and frequency of the beeps. The closer you get to the buried victim,

the louder and faster the beeps are emitted. When the distance between the transmitter and receiver is very small, a

single continuous beep is emitted.

Notice3axes2008.indd 11

button until the symbol

button (so that it is easier to determine where the

english

29/07/08 9:04:41