User's Manual

20
21
TEKNETICS
Comprehensive Operating Manual & Guide to Metal Detecting
TEKNETICS
Comprehensive Operating Manual & Guide to Metal Detecting
LCD VISUAL DISPLAY (continued)
The target indicator arrows are coded for signal strength — bold arrow for strong signals, caret
(
^
) arrow for medium signals, and small triangle for weak signals. When sweeping back and
forth to check a target, the indications corresponding to the strongest signals will usually be
the most accurate.
TARGET DEPTH
When the trigger is pulled to facilitate pinpointing an object, the numerical display indicates the
approximate depth of the object, in inches, based on the assumption that the object is a typical
US coin. Small objects will read deeper than they actually are, and large objects will usually
read shallower than they actually are.
G.C. PHASE
This is the ground cancellation setting, 0-99. It is displayed when in the Manual G.C. menu
setting, and when the trigger is pushed for FASTGRAB™ computer-assisted ground cancellation.
SETTING
This is illuminated when you are in the menu. When the word “SETTING” is indicated, the
number being displayed is a setting, and not, for instance, a Target-ID indication.
MESSAGES
If a metal object or highly magnetic soil is so close to the searchcoil that the signal is
overloading the circuit, the message
OVERLOAD - RAISE COIL will appear.
Such overloads will not harm the detector, but the detector will not detect metals properly
under these conditions. Raise the coil until the message disappears; the siren sound will also
stop. Resume normal detection.
The message
RAISE COIL only appears when using the 3b or dP methods, accessed through
# OF TONES menu selection. This message indicates the presence of a target which may be
too close to the searchcoil to be accurately identified. For better Target Identification, sweep
the searchcoil farther away from the
surface of the ground.
The message
PUMP COIL TO GC will
appear when you push the trigger forward
to ground cancel. See the Manual Ground
Cancellation section of this manual for
instructions.
The message
CAN’T GC can only appear
when the trigger is pushed forward,
invoking FASTGRAB™ automatic ground
cancellation. This message appears when
the detector is unable to measure the soil
in a manner suitable for ground canceling.
This message is usually the result of the
presence of metal. Try another spot to find
an area free of metal.
LCD VISUAL DISPLAY (continued)
BAR GRAPHS Fe
3
O
4
(magnetite)
This bar graph displays the magnetic mineralization factor, or magnetic susceptibility, of the soil.
Magnetic susceptibility is expressed in terms of the percent volume of the iron mineral magnetite,
which most black sand is made of. The depth to which objects can be accurately identified is
strongly influenced by the magnetic susceptibility of the soil. High Fe
3
O
4
values have a greater
effect on detection depth in the Discrimination Mode than in the All Metal Mode. For the most
accurate Fe
3
O
4
reading, pump the searchcoil as though you were ground canceling.
Fe
3
O
4
approx.
Range micro-cgs Description
3 7,500 uncommon but not rare, heavy mineralization
1 2,500 heavy mineralization, not uncommon in goldfields
0.3 750 heavy mineralization, but not uncommon in some regions
0.1 250 medium mineralization, typical
0.03 75 light mineralization, but common
0.01 25 light mineralization, often low G.C. setting
blank <14 quartz & coral white beach sands
BATTERY CONDITION INDICATOR
Fresh alkaline batteries will illuminate all four bars. When no bars are displayed and the
batteries are about to go dead, the
BATT legend will start flashing. If using NiMH rechargeable
batteries, the display will remain stuck on the second or third bar for most of the battery life;
when it drops to the first bar, the batteries will go dead within several minutes.
FREQUENCY SHIFTING
One disadvantage of a highly sensitive metal detector is its susceptibility to electrical
interference from other electronic devices. If the detector chatters while the searchcoil is not in
motion, the cause is either electrical interference or internal circuit noise due to a high
sensitivity setting. If the detector chatters or emits intermittent false signals in the field, you are
also probably experiencing electrical interference. If you suspect electrical interference, you
may change the
T
2
’s operating frequency. This is a trial and
error method to try to find a frequency different from the
suspected source.
To shift frequencies:
1. Hold the MENU button down. Do not release the button.
2. Push the trigger forward to increase the frequency
Or pull the trigger back to decrease the frequency.
Each frequency change requires a push of the MENU
button.
Each actuation will shift the frequency by one value.
The LCD will display the frequency, from F1 to F7. The
default frequency is F4. The
T
2
will default back to F4 when
the power is switched off.
See page 28 for more information on electrical interference.