Discrimination is the detector's ability to search only certain metals. Without discrimination, a metal detector would give an audible signal even in aluminum foil (a highly conductive metal) and the seeker would not be able to go far without-and fill the pockets with objects found but without value.
A favorite proverb of searchers treasures is that discrimination should be used with discrimination. Discrimination on a metal detector should be set high enough to make the detector to ignore false alarms (i.e. to aluminum), but at the same time, any gold could no longer be found, it has a lower conductivity of aluminium.
Most detectors have a scale of 0-10 at discrimination settings. Users will find their own favorite settings, and depending on the land who do their own research. For example, if the search on the ground, many prefer not to use any discrimination because the land did not have much rubbish.
In case you are looking for in a park, a setting of about 2-3, because in general the discrimination of 4 out of 10, metal detectors may not find gold. Of course all these little tips for beginners above, concerning discrimination, are relative.
These detectors are based on a grid of concentric search coils with 2. Outdoor coil (coil transmission) is designed to generate an electromagnetic field which when it detects an object load and it's magnetic il in turn generates a low-intensity electromagnetic field what is with the field generated by the coil exterior (when the field generated by the coil is minimal object is generated field and vice versa). This electromagnetic field is detected by the indoor coil (coil reception).
Pi (Pulse Induction)
These detectors are based on a grid search with a coil (single released technology) or two concentric coils (double pulse technology). Search coil generates a load metallic object magnets, this in turn engenders its own electromagnetic field makes commandline with initial torque. This couple is analyzed in the break between two pulses by the detector.
Recommendation: this type of detector is recommended for deep searches. Is a search object detector intended for very small sizes not buried at great depths. Represents the most suitable solution for detection of metallic treasures, vases, various objects. It is used also in archeology and security.
BFO (Beat Frequency Oscillator)
This detector is based on a detection coil what swings with the same frequency, synchronous with a precision oscillator located inside the detector. When a metallic object is in the range of the search coil (ii) its frequency change, realizing such an imbalance between the two oscillators.
Considering the fact that most manufacturers keep out to provide details of the performance of detection depth will offer is a list of the main models of existing detectors on the market as well as their performance in detection depth. These data were collected by me over the internet. Personally I only tested some of these detectors. For other good take your those who say they have tested these detectors and they offered me this data.
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More details on discrimination in metal detecting can be found in the video below:
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