balancing process of the device according to the above description.
The balancing should be carried at an area with no metal objects near the search coil
(otherwise they would interfere the balancing process). This is easily established, if the
GROUND knob is turned to a middle position and the search coil is moved horizontally
above the terrain, i.e. without changing its distance towards the ground. When there are
no metal objects, the predefined from the THRESHOLD knob sound would not be
changed. One other possibility is the chosen balancing area to be searched for iron
objects in advance while using the automatic ground balance working mode (GROUND
switch turned to AUTO position).
After the balancing has been finished, the GROUND switch remains in MANUAL position
(manual ground balance), while the DISCR and THRESHOLD knobs are turned to the
desired levels.
When changing the terrain (changing the soil characteristics) the device should be
balanced again following the above-described way, so that it remains stable.
4.
THRESHOLD
knob:
- It serves for assigning the necessary audio threshold. It is adjusted with no metal
objects around the metal detector’s search coil and depends on the terrain. The best
depth for finding metal objects is achieved, when the THRESHOLD knob is turned in a
position, corresponding to a quiet “buzzing” sound made by the metal detector in
working mode (makes recurring sound). This mode is suitable for experienced seekers.
The beginners should work at lower levels.
When in manual ground balance working mode, the device should be balanced before the
final audio threshold level is assigned.
The maximal audio threshold corresponding to a stable device condition depends on the
terrain’s characteristics, the device balancing (in the manual ground balance working
mode) and the search speed.
5.
DISCR
knob:
- It serves for adjusting the iron and tin-foil detection/rejection level and for adjusting
the depth of discrimination (the maximum depth to which the metal detector distinguish
the metals).
In “0” position, the metal detector makes unaltered sound for all metals, i.e. it does not
distinguish them. That is why this position is the same as the “GBS” position, which is
used for balancing of the device, with the aim of achieving the maximal balance for a
particular terrain.
When the level is turned to a higher position, the metal detector starts to distinguish the
metals, and each successive level betters the discrimination, i.e. at level “10”, the metal
detector rejects the iron and the tin-foil at an utmost degree and has the maximum
depth of discrimination.
When detecting non-ferrous metals (copper, bronze, silver, gold) it makes deep-toned,
non-pausing sound, while for the ferrous metals (iron) the sound is pausing (recurring).
For levels from “5” to “10”, the metal detector rejects the iron and tin-foil objects at a
different level, i.e. when detecting iron or tin-foil object it is making either no sound or a
quiet pop sound.
The most practical working mode, when searching for non-ferrous metals, are the levels
from “6” to “8”. When detecting unstable (whether its corresponding to a real object)
signal - usually for heavily corroded iron or iron with alloys, the level could be turned to
“10” in order to get more accurate signal discrimination. The surface sweeping of the
particular terrain could contribute to the further improvement of the detecting, because it
results in shortening the distance to the buried detected object.
In many polluted areas, small corrosion iron pieces such as wire, small sheet iron, etc.,
fall in the area of regulating the ground balance, not discrimination. To this end, they are
ignored in manual ground balance mode and the metal detector is balanced directly on
them (corrosion piece of wire or sheet iron) to completely ignore them (usually between
level 8 and level 10 of potentiometer potentiometer DISCR between level 8
and level 10).
BLISSTOOL LTC48 –
User Guide (version EN200908131904)
Page 9 of 15
