The reason for this, is that such terrains are usually with negative mineralization and thus mask
(hide) the deep non-ferrous objects as ferrous. So, if under such conditions be set a maximum depth
of discrimination (DISCR DEPTH potentiometer set to level "10"), has probability the weaker signals
from non-ferrous metals to be rejected as ferrous. To prevent this, is sufficient the DISCR DEPTH
potentiometer to be set at a lower level: "9", "8" or even at level "7", if the terrain is not contaminated
with very small and small irons.
For optimum performance under such conditions, it is desirable the metal detector to be preset
and balanced on the terrain to a specific piece of ceramic and/or stone, as described in points
9.3, 9.4, 9.5 and 9.6 methods (manual and automatic ground balance).
In practice, in discrimination mode, under extreme field conditions, such as contaminated and
simultaneously mineralized terrains, the user must make a choice:
Choice 1: to adjust DISCR DEPTH potentiometer at level "10" to reject the smallest irons, ie any
tendency to iron signal, in order not to dig iron, but with risk to miss the weak signals from small or
deeply buried non-ferrous metals;
or
Choice 2: to adjust DISCR DEPTH potentiometer at level "8" to easily detect non-ferrous metals
present in greater depth in the relevant mineralized terrain or that are located in mineralized
ceramics and/or mineralized stones, but while not entirely to reject many small irons and partly small
irons, ie may need to dig some and other irons at the relevant contaminated terrain.
The specific behavior of the metal detector at the selected setting of DISCR DEPTH potentiometer,
depends and from the current settings of the DISCRIMINATOR switch and DISCR LEVEL
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.
9.12. Loudspeaker
The Loudspeaker serves for producing a sound when the metal detector
detect an object. The sound is deep-toned and non-pausing for non-ferrous
metals and recurring (repeating) for ferrous metals (iron).
The loudspeaker lies on the back panel of the electronic block.
BLISSTOOL LTC64X
- User Guide (version EN201405101504)
Page 29 of 42
