Selective Metal Detector SOREX PRO. Operating manual.
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In second case (right picture) it is safe to say that there is a flat iron target
under the coil, a piece of iron roof coating, fragment of a kettle, for example.
Multi-frequency
You are likely to be amazed by the fact that most devices produced worldwide
have similar sensitivity, for example, to a brass disc with the diameter 25 mm and a fifty
mm copper disc, although the second target is much bigger. It is known that small targets
(coins) are better found in high searchcoil excitation frequencies.
The point is that due to specific physical laws, each target group has its own
optimum frequency which gives maximum sensitivity to those targets.
To provide device performance in the search for large and small targets many
manufacturers produce 2, 3 or 4 frequency detectors.
Sorex Pro is a multi-frequency device which allows working with searchcoils of
any excitation frequency within the range of 2-22 kHz, putting into action the principle of
the sensitivity acceptable for almost any group of targets.
Standard Sorex Pro set may include the following searchcoils:
15DD – 3 kHz, 9,5х12,5DD – 7(3) kHz, 10DD – 7 kHz, 6х10DD – 7(14) kHz.
Are there any practical recommendations on the selection of converter with a
certain operating frequency?
3 kHz may be successfully applied in trashy areas to search for large targets
made of ferrous and nonferrous metals as well as spoils of war.
7 kHz – medium universal frequency for a wide range of goals.
It can be used for the search for medium, small coins and spoils of war.
This frequency is suitable for the on-the-ground reconnaissance.
14 kHz is a frequency suitable for small and medium coins, especially when they
lay "on the ridge". This frequency is efficient for the beach search».
Search and identification methods
General Guidelines
Sweep searchcoil above the surface keeping constant distance of 2-3 cm.
This distance is optimum in terms of neutralizing soil mineralization, hence optimum for
the right identification of the metal object type.
Warning! An important thing to remember.
Moving the searchcoil to the ground surface (not to the grass, but to the soil in
particular) closer than 2-3 cm you get into the so-called "Close Zone" (CZ) of the
searchcoil interaction with the low-magnetic and low-conductivity environment - the
soil, as it was mentioned in the "Ground Balancing" section. In this zone the physical
interaction pattern changes significantly, and that may lead to false responses of sound
indication with high sensitivity levels.
Don't touch the ground with the searchcoil. It's important to keep constant
distance between searchcoil and ground surface. Have in mind that proper object
identification, number of false responses and sound indications of high sensitivity levels
depend on the performance of this operation.
Try to avoid horizontal searchcoil jerks. Optimum scanning speed 40-50 cm/s
Each successive scan must overlap the previous one at least by a half.
