تويت
The most common and demanded variety metal detectors - are devices that operate on the so-called balance principle induction (IB). The main advan***e - the ability to distinguish metal ******s on their conductivity and ferromagnetic properties, as well as the ability to build up from the ground.
We have provided this type of microprocessor-****d induction dual-frequency metal detector Koschey-18M. In this device, as in all other our metal detectors, implemented a number of original technical solutions, which enable us to win on a number of parameters compared with analogues. More technical details can be found in the loop our journal articles and technical ********ation links that exist in the archive at the bottom of this page.
At present, the unit comes with firmware V2.2. Also been developed and tested firmware V3.3 (for underwater devices). To Homebrew device is available as a set semi-finished products, as well as a set of Master Keith VM8043.
Basic Specifications
Maximum depth of detection of ******s (by air):
The coin is 25mm in diameter to 30cm
Helmet to 1m
Maximum depth to 2m
Indication:
Visual graphical and ****ual, LCD 132h32 point
Sound 18-tone or 2 tone
Search Mode selective and nonselective
The number of working frequencies 2 (7 and 14kHz)
Battery life:
with acid battery 1.3a / h to 12chasov;
with NiMH battery 2 A / h up to 20h;
Diameter sensor 200mm;
The length of rod adjustment (800-1400mm);
Weight, not more:
with acid battery 1.3a / h 2.0kg;
with NiMH battery 2 A / h 1.8kg;
Appearance metal detector Koschey-18M in the collection:
We have provided this type of microprocessor-****d induction dual-frequency metal detector Koschey-18M. In this device, as in all other our metal detectors, implemented a number of original technical solutions, which enable us to win on a number of parameters compared with analogues. More technical details can be found in the loop our journal articles and technical ********ation links that exist in the archive at the bottom of this page.
At present, the unit comes with firmware V2.2. Also been developed and tested firmware V3.3 (for underwater devices). To Homebrew device is available as a set semi-finished products, as well as a set of Master Keith VM8043.
Basic Specifications
Maximum depth of detection of ******s (by air):
The coin is 25mm in diameter to 30cm
Helmet to 1m
Maximum depth to 2m
Indication:
Visual graphical and ****ual, LCD 132h32 point
Sound 18-tone or 2 tone
Search Mode selective and nonselective
The number of working frequencies 2 (7 and 14kHz)
Battery life:
with acid battery 1.3a / h to 12chasov;
with NiMH battery 2 A / h up to 20h;
Diameter sensor 200mm;
The length of rod adjustment (800-1400mm);
Weight, not more:
with acid battery 1.3a / h 2.0kg;
with NiMH battery 2 A / h 1.8kg;
Appearance metal detector Koschey-18M in the collection:
The appearance of the electronic unit. Faceplate combined with an ergonomic keyboard membrane. Housing is made impact-resistant plastic. To connect the sensor used dustproof BNC connector with gold plated contacts.
Electronic unit with the cover removed:
Answers to questions (FAQ)
Q0 Where to see the scheme, as most do sensor, how to set up, how to use the device and so on?
A0 Answers to most of these simple questions you poluchitete, after reviewing all ********s from the archives at the bottom of this page.
Q1 I want to try to make a sensor of another size. How do I calculate?
A1 When you change the size of the sensor is desirable to keep the inductance coils (with an accuracy of + / - 20%). You also need to maintain their relative sizes. In the first approximation we can assume that the inductance proportional to the diameter of the coil and the square of the number of turns in the coil.
For example, we want to make a probe diameter of 25cm. Tenured sensor has a diameter of 19.5 cm Ie rate increase will be 1.28. The diameter of the transmitting coil of the new sensor (with walls) will be about 24cm. Calculate the new number of turns = 21/SQRT (1,28) = 19. The diameter of the receiving (and compensating) coil in the nominal sensor 12cm. Diameter spool in the new sensor will be 12 * 1.28 = 15cm. Number of turns = 210/SQRT (1,28) = 186. The number of turns of the compensating coil = 9/SQRT (1,28) = 8.
Q2 In what settings, has a metal detector the highest sensitivity?
A2 Increased 8
Frequency 7kGts
Filter 1
Threshold Wed 2 ... 5 (depending on the interference situation)
In the V2.2 firmware are the correct settings for the fifth profile. But to use such a profile should be wisely - only if you allow the mineralization of soil and noise conditions (see instruction manual).
Q3 Is it possible to reduce the consumption of the product?
A3 Yes, in two ways - either by reducing the resistance of the transmitting coil, either by increasing its inductance. To reduce the resistance of the coil possible by increasing the diameter of the wire. But in this case will be significantly vozrostat and weight sensor. Zoom inductance of the coil can increase number of turns (or its diameter). In this case, the mass sensor will not increase so much, but, unfortunately, will decrease and depth. For example, here are two payment schedule (for the frequency 7kGts). The first - shows consumed current dependence on the number of turns of the transmitting coils, as well as the diameter of the wire (at a constant diameter of the sensor). The second graph -- dependence of the depth found coins from the number of turns transmitting coil (at a constant diameter and constant parameters of the sensor spool). Ie If you care about reduce the consumption of the device -- (eg, expected long expedition and nowhere to recharge batteries), then you can make in this case additional "low power" sensor. His transmitting coil must contain a greater number of turns compared with full-time sensor, which is described here. In the compensating coil should also be proportional increase the number of turns.
Q0 Where to see the scheme, as most do sensor, how to set up, how to use the device and so on?
A0 Answers to most of these simple questions you poluchitete, after reviewing all ********s from the archives at the bottom of this page.
Q1 I want to try to make a sensor of another size. How do I calculate?
A1 When you change the size of the sensor is desirable to keep the inductance coils (with an accuracy of + / - 20%). You also need to maintain their relative sizes. In the first approximation we can assume that the inductance proportional to the diameter of the coil and the square of the number of turns in the coil.
For example, we want to make a probe diameter of 25cm. Tenured sensor has a diameter of 19.5 cm Ie rate increase will be 1.28. The diameter of the transmitting coil of the new sensor (with walls) will be about 24cm. Calculate the new number of turns = 21/SQRT (1,28) = 19. The diameter of the receiving (and compensating) coil in the nominal sensor 12cm. Diameter spool in the new sensor will be 12 * 1.28 = 15cm. Number of turns = 210/SQRT (1,28) = 186. The number of turns of the compensating coil = 9/SQRT (1,28) = 8.
Q2 In what settings, has a metal detector the highest sensitivity?
A2 Increased 8
Frequency 7kGts
Filter 1
Threshold Wed 2 ... 5 (depending on the interference situation)
In the V2.2 firmware are the correct settings for the fifth profile. But to use such a profile should be wisely - only if you allow the mineralization of soil and noise conditions (see instruction manual).
Q3 Is it possible to reduce the consumption of the product?
A3 Yes, in two ways - either by reducing the resistance of the transmitting coil, either by increasing its inductance. To reduce the resistance of the coil possible by increasing the diameter of the wire. But in this case will be significantly vozrostat and weight sensor. Zoom inductance of the coil can increase number of turns (or its diameter). In this case, the mass sensor will not increase so much, but, unfortunately, will decrease and depth. For example, here are two payment schedule (for the frequency 7kGts). The first - shows consumed current dependence on the number of turns of the transmitting coils, as well as the diameter of the wire (at a constant diameter of the sensor). The second graph -- dependence of the depth found coins from the number of turns transmitting coil (at a constant diameter and constant parameters of the sensor spool). Ie If you care about reduce the consumption of the device -- (eg, expected long expedition and nowhere to recharge batteries), then you can make in this case additional "low power" sensor. His transmitting coil must contain a greater number of turns compared with full-time sensor, which is described here. In the compensating coil should also be proportional increase the number of turns.
