Mode "Economy; Mode S Algorithm; Multi-Frequency - AKA T72 Operating Manual

MODE "ECONOMY"

In the "Economy" the sensor operates at the minimum excitation current. This mode allows you to
improve the comfort of your search on soils with a complex and variable salinity (for example in the
surf of the beach), or at locations with extreme iron debris.
Attention! After switching to "Economy" mode it is advised to ground balance the device.
For reference, the detection range in this mode, when air testing a large 43cm copper coin, such as a
Victorian Penny, is approximately 35cm (10" DD coil @ 6,5-7 kHz). Thanks to the significant reduction
in the consumption of power in this mode you can run up to 40 hours on a set of fully charged
batteries. Switching to the turbo is made through the "Extras" Menu, section "Extra Settings""(see
below).

MODE S ALGORITHM

From our experience we know that the majority of metal detectors react to flat iron objects as
nonferrous. To assist in solving this problem the specially developed S algorithm is used to assist in
properly identifying these targets. The most effective use of this algorithm is in identifying small flat
iron objects (15 cm2), such as beer caps, rusted pieces roof tin, etc., with a signal rating greater than
10. If the device detects an object with a "questionable" non-ferrous signal (high tone) and it has a
rating over 10 then using the S-Algorithm can help to identify these type targets.
There is no need to use this algorithm for a definitive low-pitched signal, i.e. when the subject is
clearly iron. Remember though, to monitor the signal rating level of the target. It should be pointed
out that this mode does not apply to general searching, but only to help clarify the type of metal of a
non-ferrous response and to decide on the need to dig. The S Algorithm has virtually no effect on the
hodograph display of non-ferrous targets. It should also be noted that when increasing the surface
area of iron objects the effectiveness of the S-algorithm decreases.
To switch to this mode, use the button +/ALGO , the values of the parameters RT and ST sensitivity
and volume should be displayed. To return to the main search mode press the +/ALGO button again.

MULTI-FREQUENCY

You may be interested to know that most of the detectors manufactured in the world will have a
comparable sensitivity, for example, a brass disk with a diameter Ø25 mm and copper disc at Ø50
mm, despite the fact that the second object is much larger. It is also known that small targets (coins)
are detected better at higher coil excitation frequencies.
The fact is that by the virtue of certain physical laws each target class has its own optimal frequency
at which the sensitivity to these targets are maximized. In order to give the unit the opportunity to
search effectively for both large and small targets, many manufacturers produce 2, 3 or 4-frequency
metal detectors. The T.72 allows you to work with coils with the operating frequencies from 1 to 30
kHz, thus maintaining acceptable sensitivity to almost any type of target.
The metal detector can be equipped with many different coils/sensors of different shape and
frequencies ranging from 1 to 30kHz. What could be the practical guidelines for choosing a coil with a
different operating frequency?
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