9.10. DISCR LEVEL potentiometer
The DISCR LEVEL potentiometer serves for adjusting the detection/rejection
level of iron, tin-foil and low-grade non-ferrous metals (usually pollutants),
and for baseline exclusion of the discrimination (All metals mode) when it is
set to level "0".
The recommended levels for DISCR LEVEL potentiometer are:
- from "3" to "6" at DISCRIMINATOR switch in mode "I";
- from "3" to "8" at DISCRIMINATOR switch in mode "II";
- from "3" to "10" at DISCRIMINATOR switch in mode "III";
Most often works at level around "4". For beginner searchers is recommended
work at higher levels (about level "6").
In level "0” the discrimination is excluded
, ie the metal detector produced same sound for
all metals, ie it does not distinguish them and does not rejected them. For a complete
exclusion of the discrimination, may further the DISCR DEPTH potentiometer also to be set at
level "0".
In level "0" of DISCR LEVEL potentiometer, in combination with level "0" of DISCR DEPTH
potentiometer, the metal detector is in real mode "All metals". This mode is appropriate when the
target is to be detected absolutely all metal objects available in the soil (ferrous and non-ferrous
metals). In this mode, is recommended to carry out precision choice of auto ground zone and/or
manual balancing of the metal detector, with the aim of achieving the maximal balance for a
particular terrain.
When increasing the level of the DISCR LEVEL potentiometer, the metal detector
starts to distinguish the metals
, and at each successive level betters the discrimination, ie
the metal detector rejected to a greater extent iron, tin-foil and low-grade non-ferrous metals.
Upon detection of non-ferrous metals (copper, bronze, silver, gold) is heard a short, dense and
uninterrupted single sound with each pass of the search coil over them.
Upon detection of ferrous metals (iron), the sound is interrupted (intermittent), blunted or absent, ie
they are completely ignored (rejected). Moreover, in the most cases, especially when they have a
long side, the ferrous metals issue dual sound (two sounds one after another) with each pass of the
search coil over them.
In a large local inhomogeneity (clusters) on a particular stretch of the terrain, such as topical
clustering of irons, in locally scattered small irons, on terrains with a high content of ore and slag, or
on terrains whose soil is mixed with small pieces of mineralized ceramics, it is possible the metal
detector to produce a sound, that is long and scattered, and sometimes heterogeneous, broken or
blunted. By nature, it can remind the sound of ferrous metal or sound of non-ferrous metal, but
always apart from them, for example, that it is long and scattered, ie it has not solid area for
centering.
At levels from "3" to "10", the metal detector rejects at a different level iron objects, tin-foil
and low-grade non-ferrous metals, ie when detecting them it is making either no sound or a
quiet pop sound.
Upon detection of very weak signal, for its better detection and discrimination, that surface may be
slightly cleaning by removing from 1 to 3 cm from the soil layer, to reduce the depth of which is
buried the found object.
Upon detection of unresolved (dubious) signal, usually heavily corroded iron, iron with alloys or
deeply buried non-ferrous metal, to assess what is the metal, it can be studied at different
levels of discrimination. For this purpose, the level of discrimination set by DISCR LEVEL
potentiometer can be increased further, or the metal detector to be switched to lower
discrimination mode through DISCRIMINATOR switch.
In v3, in small degree has improved and the discrimination. For the same discrimination, compared
with v2, in v3 is necessary to work with smaller levels of discrimination. Example: for v2: DISCR
LEVEL = 5; and for v3: DISCR LEVEL = 3.
The specific behavior of the metal detector at the selected setting of DISCR LEVEL potentiometer,
depends and from the current settings of the DISCRIMINATOR switch and DISCR DEPTH
BLISSTOOL LTC64X
- User Guide (version EN201405101504)
Page 26 of 42
