9.2. FREQUENCY potentiometer
The FREQUENCY potentiometer serves to change the operating frequency of
the metal detector in range +-60Hz, in order to avoid external interferences
such as: interference from other close working metal detector with the same
or similar operating frequency; and powerful industrial interferences.
The presence of external interferences is expressed as: onset of
instability of the audio threshold of the metal detector, marked and
continuous increase in its instability, or total collapse of the audio
threshold.
The recommended level for FREQUENCY potentiometer is level "MAX", or levels close to level
"MAX".
In the level "MAX" of the FREQUENCY potentiometer, the system for frequency adjustment is off and
the metal detector operate at its base operating frequency.
In the occurrence of instability in the audio threshold, with a character as described above, in order
to smooth the audio threshold and stabilization of the metal detector, is required by FREQUENCY
potentiometer to change the operating frequency of the metal detector.
Under the same conditions, when connected to the metal detector of another, additional, BLISSTOOL
search coil, other than the standard 28 cm (11") DD search coil BLISSTOOL DD28SC2, with which the
metal detector is equipped in the standard package, the best base setting of potentiometer
FREQUENCY may be different than the recommended for the standard package level "MAX". For the
new search coil, the best base setting of potentiometer FREQUENCY is where the metal detector
detects with a clear rich sound the weak signals from deeply buried metal objects. Accordingly, the
best setting is a combination of individual settings of potentiometer FREQUENCY and potentiometer
TONE.
The change in the operating frequency of the metal detector is done by adjusting the
FREQUENCY potentiometer to any of the levels at level "9" to level "MIN". Choose that level at
which the audio threshold of the metal detector regains its stability.
Because their primary function, the setting of the FREQUENCY potentiometer affect to the other
settings of the metal detector and especially on its ground balance. It is desirable for this setting to
be done before the rest of the metal detector settings, or after any change of the FREQUENCY
potentiometer, to be done complete setup of the metal detector.
9.3. GROUND MODE switch
The GROUND MODE switch serves for switching between the two working
modes of the metal detector:
MAN: Manual ground balance
AUTO: Automatic ground balance
The recommended positions for GROUND MODE switch are: position "AUTO" for beginners and
position "MAN" for experienced users.
Manual ground balance mode and Automatic ground balance mode relate to the chosen
technology for eliminating the ground (terrain) interference on the metal detector’s work.
The ground (terrain) interference usually causes instability of the metal detector and false signal
registration (during the search while the search coil is moving, the metal detector is making sounds
without real to has detected metal object).
When working with a manual ground balance mode (GROUND MODE switch turned to the
"MAN" position), the ground interference is eliminated by manual adjustment of the metal
detector by the user, by following the procedure given in the description of the GROUND
COARSE and GROUND FINELY potentiometers, available below.
Manual ground balance mode is appropriate for terrains with homogeneous soil, where the metal
detector would reach its full potential by a fine manual adjustment.
When working with an automatic ground balance mode (GROUND MODE switch turned to the
"AUTO" position), the metal detector’s electronics automatically eliminates the ground
BLISSTOOL LTC64X
- User Guide (version EN201405101504)
Page 18 of 42
