potentiometer. Therefore, the optimal setting of discrimination is different for each terrain and can
only be achieved with practice and knowledge of the metal detector and the terrain.
It is recommended to work at possible lower level of DISCR LEVEL potentiometer. Working at a
higher than real proper level of DISCR LEVEL potentiometer, in combination with set at a higher level
DISCR DEPTH potentiometer, and set to a lower mode DISCRIMINATOR switch, may lead to rejection
of signals from small or deeply buried non-ferrous metals, especially when they are at great depth in
mineralized terrains, or under mineralized ceramics and/or mineralized stones.
9.11. DISCR DEPTH potentiometer
The DISCR DEPTH potentiometer serves for adjusting of a specific depth of
discrimination. This is the maximum depth to which the metal detector
distinguish the metals, ie the depth to which the metal detector rejects
respective ferrous metals and pollutants.
The recommended levels for DISCR DEPTH potentiometer are:
- level "10" for terrains contaminated with small irons (small heavily corroded
iron nails, iron nails with large head, small pieces of wire, small highly
corroded irons and steel);
- from level "7" to level "9" for non contaminated with small irons terrains;
- from level "0" to level "6" when search for any type of metal (ferrous and
non-ferrous), ie when not intended to ignore ferrous metals.
Most often works at level "9". For beginner searchers, and in the presence of
small iron, is recommended work at level "10".
By increasing the level of the DISCR DEPTH potentiometer, set the depth of discrimination begins to
grow, and increasing from 0% to 100% of the real potential for the respective metal object.
The depth of the discrimination does not increase linearly with increasing the level of DISCR DEPTH
potentiometer, and strongly depend from the dimensions of the respective metal object (sizes, form,
uninterrupted flat surface).
In the table available below, are presents indicative data for the function of the DISCR DEPTH
potentiometer in respect of metal objects with different flat surface. The depth of discrimination is
presented in percentages (%) and in the approximate their equivalent in centimeters (cm) for real
search on terrain.
Given that in real the depth of detection is the distance from the metal object to the surface of
the search coil, and given that in standard search underway, usually the search coil is located
at a distance from 1 to 3-5 cm above the surface of the terrain, ie these centimeters are
literally lost in regard to a maximum depth of detection, in the table in bold are presented
practically important data for the depth of discrimination, in real field work for the relevant
setting (level) of the DISCR DEPTH potentiometer.
The shown in the table percentages (%) and corresponding centimeters, are indicative and
refer to the worst case, ie relate to iron objects that are ignored by hard (Group 1) compared
to the other (Group 2):
Group 1:
iron objects with round, square and/or rectangles form, with ratio of their flat sizes
1:1 or 1:2, ie these are iron objects whose form is similar to the form of coins. The iron
objects with such form are the most difficult to ignore, and exactly data about them are
available in the table above;
Group 2:
iron objects with elongated form, with ratio of their flat sizes 1:3, 1:4, 1:5... 1:10
and so on, ie they are iron objects whose one size many times exceeds the other. Such are
various long pieces of wire, various blades, large nails, etc. Iron objects of such form are
ignored and/or identified as iron much easier, especially if their long side is located along and
across to the surface of the search coil. For such objects, the real percentages (%) and
corresponding centimeters, are higher than those described in the table above.
BLISSTOOL LTC64X
- User Guide (version EN201405101504)
Page 27 of 42
