The balancing is actually finding the level (position) from the GROUND potentiometer, in which the
descriptions in the way of movement of the metal detector search coil does not beeps or issue
possible weak sound, or at least to preset audio threshold level did not change significantly.
In mineralized terrains, if has a strong responsive signal from the terrain and the manual
balancing is difficult or the seeker has small practical experience, is recommended THRESHOLD
potentiometer to return with one or two levels back at the level where the metal detector
starts to slightly zoom, then proceeding to the descriptions above balancing. In addition, in
order to reduce the response signal from the ground, can be set in advance desired level of
discrimination (DISCR LEVEL potentiometer from level "GBS" is placed in the desired operating
level) and then carry the 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, ie the piece of
land on which it is described vertical movement of the search coil should not contain metal objects.
Otherwise they would interfere the balancing process and the metal detector can not be
balanced or will be balanced incorrectly. Whether the area is clean is easily established, if the
GROUND potentiometer is turned to a middle position and the search coil is moved horizontally
above the terrain, ie without changing its distance towards the ground. When there are no
metal objects, the predefined from the THRESHOLD potentiometer sound would not be
changed. One other possibility is the chosen balancing area to be searched for metal 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 LEVEL and THRESHOLD potentiometers are turned
to the desired levels.
When changing the terrain with another, significantly different from the previous (changing the soil
characteristics) the device should be balanced again following the above-described way, so that it
remains stable.
9.5. THRESHOLD potentiometer
The THRESHOLD potentiometer serves for assigning the necessary audio
threshold and sensitivity of the metal detector.
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
potentiometer is turned in a position, corresponding to a quiet zoom sound
made by the metal detector in working mode (issued torn sound, buzzing,
whiz).
Quiet zoom sound mode is suitable for experienced seekers. The beginners should work at
lower levels.
When working in manual ground balance mode, is necessary the final audio threshold level to
be set only after the unit is balanced.
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 user search speed.
BLISSTOOL LTC48X -
User Guide (version EN201008241400)
Page 13 of 28
