Pros and cons of buying used metal detectors. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / metal detectors
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About the used metal detector market
In the metal detector market, there is a constant rotation of devices among search engines. This is due to the desire to purchase a more powerful metal detector. This is entirely justified.
A metal detector is a fairly reliable electronic mechanism. It has been noticed that most often only search elements (coils) that are subject to constant mechanical impact on the ground, hard grass, and stones fail. With such an impact, microcracks often appear on the coil, through which moisture gets inside and, over time, leads to the closing of the turns of the search element. Such an element cannot be used, it produces a result that does not correspond to reality.
Such a malfunction can be identified at the time of purchase. The main sign of a faulty coil is that when the metal detector moves through the air, at a level of 7 m above the ground, the metal detector gives signals that supposedly it "sees" metal, mostly "color".
When replacing the search element with a new one, this malfunction disappears.
Checking a used metal detector upon purchase
When buying a used metal detector, you need to check the operation of both the device itself and the search element.
The electronic part of the metal detector is checked by switching between all possible modes. It is necessary to place the metal detector horizontally at a level of 1 m above the surface. Take several objects of different composition (coin, lighter, iron object, etc.) and check the work by moving these objects in front of the metal detector coil.
In this way, you can see how deeply the metal detector “sees”, what signals it gives out on various metals.
After checking the metal detector in a static horizontal position, it must be checked in the working position.
This method is described for outdoor testing. Indoors, it is necessary that the distance from the walls to the metal detector is at least 2 m.
To check it is necessary:
- pick up a metal detector;
- lower to the surface;
- make several movements, as during the search.
Author: Dubrovsky S.L.
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