Mode; All Metal Mode - Teknetics T2 Operating Manual And Manual

MT2E-TekneticsMANUAL.qx6_MT2E manual 10/20/14 11:10 AM Page 15
TEKNETICS
Comprehensive Operating Manual & Guide to Metal Detecting
SEARCH TECHNIQUES (continued)
To narrow the response further, position the searchcoil near the center of the response
Narrow It Down
pattern, release the trigger, and then pull it again. Now you will only hear a response
when the searchcoil is right over the top of the target. Repeat this procedure to narrow
the zone even further. Each time you repeat the procedure, the field of detection will
narrow further.
Estimating Target SIZE, DEPTH, and SH PE
When the trigger is pulled to activate Pinpoint, the LCD displays estimated depth. The
estimate is based on the presumption that it is a coin-sized target.
But what if it is not a coin-sized target? The most common example is that of an aluminum can.
Flattened aluminum cans are usually identified as dimes or quarters. Their large size will
produce a strong signal, tricking the microcomputer into thinking that it is a shallow coin.
The following technique differentiates buried aluminum cans from coins. Sweep back and forth
to get a feel for the target, keeping the searchcoil close to the ground. Now, continue to sweep
back and forth as you slowly raise the searchcoil higher and higher. If the response
diminishes quickly and never gets very broad, the target is probably a coin. If the response
diminishes slowly as you lift the searchcoil, and you get a broad response, the target is
probably an aluminum can. Practice this by laying a coin and a flattened aluminum can on the
ground; you will quickly understand how to differentiate the two and will probably never have
to dig another aluminum can again. And, you will know whether it was deep or shallow. This
technique works well in the All Metal Mode, and to a lesser extent in Discrimination Mode.
Objects which are ring-shaped, or flat and round like coins, tend to give a narrower, crisper
response than objects of similar size with irregular shapes. The easiest way to demonstrate
this is with an aluminum screwcap from a soda bottle. In its normal shape, it occupies a
volume, and gives a somewhat broader response than that of a coin. But if you flatten it, the
response will be crisper and more like that of a coin. Again, these differences are most readily
noticed in All Metal Mode.
Long skinny iron or steel objects such as nails usually produce a double response when
scanned lengthwise, and a weaker single response when scanned crossways. This is most
noticeable in the All Metal Mode. However, a coin lying on its edge can produce a similar
response, so rely on both the Target-ID as well as target feel to distinguish between different
kinds of objects. Objects within 2 to 3 inches of the searchcoil will often produce multiple
responses as you sweep across them, because the response field close to the searchcoil is
irregular.
26
Comprehensive Operating Manual & Guide to Metal Detecting
D.S.T. (DIGITAL SHIELDING TECHNOLOGY)
Traditional detector technology requires users to "work into the noise" at high gain settings to
achieve maximum possible depth. The T 's latest technological advance,
2
Digital Shielding Technology (DST ), permits the use of maximum sensitivity settings with
®
minimum background noise. This noise reduction reduces user fatigue and enhances the
detecting experience.

ALL METAL MODE

The All Metal Mode is more sensitive and offers better feel than the Discrimination Mode, and
is used to find all metal objects present in the ground. The searchcoil must be in motion for
objects to be detected. This is a single filter search mode similar to the "fast autotune",
"SAT", or "P4" Mode found in other detectors you might already be familiar with.
SENSITIVITY
This controls the electronic gain, and is adjustable from 1 to 99. In the
presence of electrical interference, high ground mineralization, or variable ground
mineralization, operation will usually be too noisy (wobbly and erratic sound from the speaker)
if the sensitivity is set too high. At settings above 90, the internal circuit noise of the machine
will probably be audible. The sensitivity level setting is largely a matter of personal
preference. However, if you cannot hear at least some noise, the smallest or deepest objects
will not be detected.
HUM LEVEL
This is the same thing that some manufacturers call audio threshold. It is
adjustable from -9 to +9. For maximum ability to hear the weakest signals, adjust this
background hum level high enough so that it is barely audible while the detector is in use in
the field. To eliminate the weakest signals, adjust the hum level into the negative region,
which will allow the machine to run silently if the Sensitivity is not set too high.
The hum level changes slightly with each detent step on the Settings knob. Each number on
the hum level numeric readout corresponds to five steps.
Manual Ground Cancellation can only be performed while in the All Metal Mode, but the
MANUAL GROUND CANCELLATION
resultant setting will carry over if you change into Discrimination Mode. See the previous
section on Ground Cancellation for instructions on how to use this feature.
TEKNETICS
15