VOSS HD 3900, Manual, Page: 9 / 12

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5. OPERATION
our detector has 3 operation modes: ALL, DISC, TARGET. This three s are motion
modes. You have to move the search coil to find your target.
5.1 ALL. Usually is used in general searching. In this mode, the unit will respond all kinds
metal. This mode can not discriminate metal type.
5.2 DISC. can help you to search and discriminate the target type. When mode switch is in
DISC mode, DISC knob is used to control the discrimination range. When DISC is set to
zero, unit will respond to any metal object with a tone. Slowly rotate the control clockwise
high position to reject more objects you don t want. The unit will sound a tone, or even
be silent to ferrous metal objects. This means the ferrous metal is rejected. Rotate the
control further clockwise, nickel, zinc, and copper will be rejected. When more again, most
metal objects are rejected, except silver.
5.3 TARGET. The operation mode TARGET is non-motion mode. It works together with
ALL mode to pinpoint the target accurately at a lower sensitivity. Set MODE switch to ALL,
hold the searchcoil 50CM or more away from the ground. Press and hold down the
TARGET button. Sweep the seachcoil slowly over the search area and then you will hear
a constant sound when the coil approaches the target, release the button, wait one or two
seconds, then press and hold down the TARGET again, and the unit s sensitivity reduces
along with. Sweep the searchcoil like the coil is the first time, and this time you will hear
the sound once more only when the coil is more close to the target, release the button
here. Repeat the above steps until the unit only sounds in a coil-size area. thus you
npointed the location and the target should be under your searchcoil.
5.4 SEARCHING COIL SWEEPING
Keep the search coil moving at a comfortable rate. TAKE YOUR TIME. If you walk too fast
u can t overlap yours sweeps and you ll miss a lot of ground. Also if you sweep too fast,
u ll lose sensitivity and miss the target.
Keep the search coil parallel to and as close to the ground as practical. This is important
for maximum coverage and depth. If you re hunting on a lawn you can rub the coil right on
the grass.