16
TEKNETICS
Comprehensive Operating Manual & Guide to Metal Detecting
TEKNETICS
Comprehensive Operating Manual & Guide to Metal Detecting
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 26 for more information on electrical interference.
21
DISCRIMINATION MODE
The Discrimination Mode is used to eliminate from detection trash metal objects such as nails,
aluminum foil, or pull-tabs. The searchcoil must be in motion for metal objects to be detected.
Discrimination incurs some loss of sensitivity to small or deep objects.
SENSITIVITY
This controls the electronic gain, and is adjustable from 1 to 99. Unlike the All Metal mode, the
Discrimination mode is designed to operate silently. If you hear noise when there is no metal present
or when the searchcoil is not in motion, reduce the Sensitivity setting until the machine goes quiet.
NOTE: there is no interaction between the sensitivity settings of the All Metal and
Discrimination Modes.
DISCRIMINATION LEVEL
This is adjustable from 0 to 80, and controls the range of objects to be eliminated from
detection (silenced, discriminated out or rejected). Objects with numeric values below the
selected discrimination level will not be detected. NOTE: the numerical range that pertains to
each class of object is printed at the top of the visual display. To eliminate iron, a setting of 40
is usually about right. A setting of 80 will eliminate aluminum trash and zinc pennies, but
nickels will also be lost.
NUMBER OF TONES (# OF TONES)
This menu selection offers the user a choice among several different methods of audio
discrimination to accommodate a variety of search conditions and personal preferences.
These methods differ in the way the signals are processed for analysis, and in the number of
audio tones used to identify different target types.
The detector has two ways of processing signals for analysis — continuous and sampled.
Continuous Processing
The detector processes a continuous signal response throughout the duration of the sweep of the
searchcoil over the target. All characteristics of the target are audibly communicated to the user.
Continuous processing gives a good feel for the size, depth, and shape of the target. Continuous
processing is preferred, for example, for relic hunting, especially in plowed or rocky ground.
Sampled Processing
Sampling takes a snapshot of the signal at its strongest point. This compromises the feel of a
continuous response, but provides for more accurate target identification. Sampling also
eliminates confusion caused by changes in tones during the sweep over the target. Sampling
is preferred, for example, when coinshooting in areas where there is aluminum trash.
The “# OF TONES” selections are:
1: Single Medium pitch tone.
Discrimination is continuous, not sampled. Good for use in plowed or rocky ground.
1+: Medium-to-High pitch tone
varying in proportion to target signal strength.
Large shallow objects will produce a squeal. The variable audio pitch provides you more
information about the detected object, but some people find the sound on strong signals too
annoying. Good for use in plowed or rocky ground.
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