Aka Sorex Pro 7281 User Manual
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Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 21 Position of some metal targets on the VDI scale(for 7 kHz searchcoils). VDI Scale Objects From -90 to -86 hot rocks, incorrectly set up ground. From -86 to -70 small nails and other metal scrap. From -70 to -50 medium size wrought nails, small arrow heads. From -50 to -35 large wrought nails, medieval knives, flat arrow heads, horseshoes, locks and other fairly big iron objects. From -35 to -10 in this iron sector ferrum is hardly presented, and nonferrous objects masked by iron come across, small odd-shaped objects made of low-conductivity nonferrous alloys (bronze crosses, thin golden earrings, chains). Pay special attention to arrow-like and thin loop-like hodographs in this sector. From -10 to +10 foil, small bronze crosses, small shotgun pellets, small pieces of gold. From +10 to +30 pre-Peter Russian coins (flakes), sailor hat bottle caps; 1,2,10,15,20 kopeks USSR coins, minted before 1961. From +30 to +50 Golden chervonets of Nicholas II, screw plugs; USSR 3.5 kopeks, minted before 1961; Horde dirham. From +50 to +70 poula, flake of the Copper Riot, small coins of the Russian Empire and early USSR, billon coins of the Russian Empire and early USSR, small silver coins of the Russian Empire of the 18th century and the beginning of the 19th century From +70 to +86 Large copper coins, silver rubles, as well as large flat or spherical iron objects (helmets, kettles, plows, axes etc). From +86 to +90 ground on the unbalanced device, hot rocks, as well as very deep large objects made of high conductivity metals (for instance, aluminum bowl, big silver salver). Hot rock is notable for stretched rubber signal, while signal from a metal object is usually concentrated in a small point. As we see, even in the nonferrous VDI sectors , trashy targets are found with valuable objects side by side. In other words, any valuable target may always have nonferrous trash with similar characteristics. Besides, do not forget that targets VDI is truthful in the reliable detection zone only and if there is no other metal object nearby. For example, iron underlaying golden chervonets of Nicholas II may take its VDI from standard +37 to plugs +18/+22. At full sensitivity limit in the ground it may suddenly sound like deep copper coin with VDI +85. It is a common feature not only for your device, but for all devices of this type. So, any cut-off and no-dig of the potential trash is a compromise between comfort and loss of valuable catch. You never know, may be that hundredth kind of plug, you did not dig after 99 of dug-up ones, was a rare princedom age coin. Warning! When using searchcoils with a low frequency of excitation current VDI parameters will have lower levels. And vice versa, higher frequency gives higher VDI.
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 22 Discrimination Sector Setup To setup required discrimination sector, press , several times, select entry setup left discriminator border. You will see a VDI digit in the square frame above the left border of the discrimination sector. Use buttons and to change this number, moving the border to the left, increasing range of targets accepted, or to the right, decreasing the range. Targets with VDI located on the scale to the left from the discriminator border, will be cut-out. Press one more time to get to the setup right discriminator border. You will see a VDI digit in the square frame above the right border of the discrimination sector. Use buttons and to change this number, moving the border to the right, increasing range of targets accepted, or to the left, decreasing the range. Targets with VDI located on the scale to the right from the discriminator border, will be cut-out. To exit discriminator setup press , or automatic exit 7 seconds after the end of the last setup input. Warning! We recommend to setup VDI value of the left discriminator border equal to the low tone border (LTB). All metals search mode In this mode the device responds to all objects, either iron or nonferrous, with the tone corresponding to objects VDI. The advantage of this mode is in high descriptiveness and informativity, giving an insight into quantities and structure of the ground metal. Apparent disadvantage is a high sound overflow, especially in trashy areas. Your device allows reducing sound overflow using iron object sound volume decrease (setup Sound Volume Fe). In this mode the device also responds to some so-called hot rocks of the prolate form. SOREX Pro identifies most of these rocks and does not give sound response to them. If you are not interested in such signals, and they even disturb you, use discrimination mode, in practice it corresponds to the all metals mode. Setup left and right discrimination border to -86 and +86 respectively. Static mode (Pin-Point) This mode is used basically as a secondary mode to clarify target location in the ground. After target detection in dynamic mode (primary search mode), put the coil
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 23 slightly aside from the assumed target location and press . Warning! Avoid turning this mode on in the zone of target sensitivity (put the coil rather far aside). Then smoothly pass it above the detected target, keeping constant distance from the ground. Sound signal volume and frequency will increase upon approaching the target, decrease upon moving away. Frequency and volume peak will be noticed at the centre of the target respectively. To finish centre clarification make two perpendicular passes. Signal peak cross, right under the centre of the coil is a target centre. At the same time, target centre clarification may be visually controlled on the screen of your device. Onscreen scale cells will be filled when approaching the target centre and brighten when moving away from the centre. Target centre corresponds to the fully filled onscreen scale. Use buttons and to adjust static mode sensitivity. If the signal is too strong and continuous, the target is large and relatively close to the surface. Raise the coil to the level where the target is less responsive and you will be able to detect target contour in the ground by crisscrossed passes. To exit the mode press one more time. Searchcoil replacement. Changes of search conditions may require replacement of a searchcoil with another searchcoil of different size and operating frequency. For example, moving from relatively clear zone to the trashy zone. The search goal may also be changed: from large to small objects. Such change increases operating frequency. Unlike other models of the line, Sorex PRO has built-in systems of automatic and semi-automatic (forced) adaptation of the searchcoil.. The automatic searchcoil replacement system detects change of the converter operating frequency and initiates adaptation process which includes selection of a new frequency and preparation of the electronic module hardware for the operation in changed frequency conditions. The automatic system is performing well for recurrent replacement of searchcoils with different frequencies. However, if you replace searchcoils with different sizes working on the same frequency we recommend you to use semi-automatic adaptation system. Operating frequencies may vary because of the technical parameter spread, but it does not mean that the automatic system would be started. The spread of technical parameters of the searchcoil may decrease sensitivity and make VDI numbers incorrect. The semi-automatic system avoids these errors. This system is useful for the correction of the influence of
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 24 significant (over 10 degrees) ambient temperature gradients, i.e. gear the device to changed temperature conditions. To initiate forced (semi- automatic) adaptation hold button with further shutdown of the device. The device automatically initiates the ground balancing (GB) when the searchcoil adaptation is over. The ground balancing is a shift of the ground vector to the horizontal axis. It shall be made in compliance with guidelines of the Ground Balancing chapter. In previous models of the product line the value (degrees) of this shift was equal to the GB value and it was displayed in the bottom left part of the display after the sound indication. However, each unit had unique GB level due to the spread of phase characteristics of searchcoils. For Sorex PRO the aforementioned phase shift (with a random pattern) is taken as default 0 for the GB behavior in the searchcoil adaptation mode. In this case all further GB phase corrections made during the search will be performed against this predefined 0-level. What are the advantages of this approach? 1. The standardization principle is used in all units: all GB shift values are similar. For example, if several devices get right GB in the adaptation mode in a certain temperature and in one area, and then perform correction in operation balance in changed temperature conditions, all devices will show relatively similar GB phase shift. 2. It is more comfortable to trace from 0 all balance changes caused by temperature and mineralization. It enables better control over the GB quality and better device overall performance and quality control. Such approach allows quick and efficient evaluation of area cleanness for the balancing. Nevertheless, we still display the value of the technically-dependent phase shift (F0) in the top left part of the screen with forced GB phase zeroing in the adaptation mode. This information is intended for the device testing during manufacture. To exit GB mode and enter the search mode also press . If your device is equipped with several interchangeable searchcoils, we recommend you, in case of idle periods (for instance, seasonal stop-over), to make hard-reset of the detector before you start the search (attach the searchcoil and turn on the device holding). It should be mentioned here that the device has a built-in diagnostic system for the searchcoil excitation circuit. In case of circuit discontinuity and disconnected converter the device onscreen message says ADAPTATION OF THE COIL IS IMPOSSIBLE with the appropriate icon in the right part of the screen showing the searchcoil symbol.
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 25 Visual Identification Tool - Hodograph In the hodographic image mode target information is shown as a vector on the graph with axis Х and Y. Its size, form and angle depend on the electric parameters of objects such as conductivity, magnetic penetration, depth, geometry etc. It is almost impossible to describe all nuances, understanding comes with step-by-step progress in visual image memorizing and it depends on practical experience. But there are some consistent patterns which may help you to start the capture, such as: 1. Hodographs of small and medium objects made of iron are located in the left half of the screen. In other words, they deflect to the left from the centre of the horizontal axis along the bottom border of the screen. 2. Hodographs of nonferrous metal objects in most cases are located in the right half of the screen. In other words, they deflect to the right from the centre of the horizontal axis along the bottom border of the screen. Rarely, small low- conductivity metal objects as well as nonferrous objects masked by iron objects may give hodograph in the left half of the screen, but with a great deflection from the zero. (to – 35 VDI). Hodographs of large iron objects (helmet, axe, tin plate) also appear in the right half of the screen. 3. Larger reflection surface and higher conductivity of the object give stronger hodograph inclination to the right. For instance, with equal diameter and thickness, copper coin hodograph would be closer to the horizontal axis than the bronze coin hodograph. That happens because copper conductivity is higher than bronze alloy conductivity. 4. Hodographs of medium and large iron objects of non-round shape often have a form of wide loop, located both in the left and in the right half of the screen simultaneously. Hodographs of nails, arrow heads and other small iron objects have a shape of straight vectors in the left half of the screen. 5. Hodographs of nonferrous metal objects in most cases have straight shape or a narrow loop shape in the right half of the screen. The advantage of hodographic indication over VDI Two representative target hodographs are shown on pictures. These objects (a coin and a piece of rusty tin) give a nonferrous signal on all similar devices. In both cases target VDI would be +76. It is seen in hodograph shape only that in first case (left picture) the target is sure to be nonferrous. N ail Grenade F 1- F oilTinc anC oinmm15 Ø C oinmm25 Ø D rain hat c h
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 26 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. Dont touch the ground with the searchcoil. Its 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.
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 27 Make additional scanning to detect object type above the center of the object, i.e. on the maximum signal line, keeping distance between the searchcoil and the ground if possible. For the same purpose it is necessary to scan found object in the direction with the least ground relief changes. In this case the ground interference is barely noticeable. Single tones or tone sequences may go along with searchcoil interaction with metal objects. Pay attention to the following: If detector responds by single tone short signal with high pitch and signal level is pretty stable then there might be a small nonferrous metal object under the searchcoil at the 5 cm depth and deeper. If several (3 as a rule) high pitch signals are heard it means that same object is in the zone near the searchcoil (less than 5 cm). At the same time signal level on the display is pretty high more than 50. Two low frequency short signals mean that there is a long ferromagnetic object (i.e. nail) located along the scanning direction. If such object is located across the scanning direction or perpendicular to searchcoil plane, then the device gives single low frequency short tone. It’s important to mention that DD-searchcoil has a complicated interaction pattern with metal objects in close zone (signal levels more than 80). That is why try to choose scan gap (distance) to provide 20 - 50 of signal level while identifying object type. In other words, try to indentify objects beyond close range zone if conditions allow you to do so. The so-called hot rocks cause problems during search operations ,their VDI is more than +84. To distinguish hot rocks and relatively large flat nonferrous objects (for example, five kopeks of Catherine II) VDI within +78 ...+86, device has special high-tone signal that differs from the usual signal tone for a nonferrous metal object. Hot rocks signal can be excluded using discriminator and setting value of first border to +86. However the most effective hot rock neutralizer is not a discrimination HRN (hot rocks neutralization) algorithm. With discrimination exclusion of sound response to hot rocks, due to ground influence, the aforementioned valuable objects with interference vectors close to hot rocks can be missed. This disadvantage is eliminated by the NHR-algorithm. Identification of flat iron objects Such objects include steel beer caps, pieces of roof layers, pieces of cast iron and so on. These are the objects causing most identification difficulties and they are often mistaken for nonferrous objects, such as coins. The right identification of such targets shall be provided by the SSF algorithm, as it was mentioned. Remember, that this algorithm requires wide scanning sweeps. Nevertheless, there is a range of technical tricks that let us distinguish such
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 28 objects. If such target gives a strong response (rating 10 and higher), the searchcoil edge scanning technique may be applied. With this scanning technique the aforementioned targets would give low tone of sound indication, and the display would show specific shift of the hodographic picture to the left (to the iron sector). These targets may also be scanned by a searchcoil located at the angle of 45° to the ground surface. It may not lead to the low-tone sound indication, but, at the same time, the hodographic picture will be more loop-like with a left-shift tendency (to the iron sector). As a rule, such output of both types of indication means that the object is made of iron. Search specifics in trashy areas The search in these areas is the most complicated due to obvious reasons in terms of the application of a metal detector. It is impossible to give well-defined and concise “trashy” technique due to the variety and multiplicity of such models. However, some general guidelines listed below may significantly increase performance in such areas. Of course, the main M/T algorithm should be used 1. Select correct general sensitivity of the device (adequate to the area trash level). The higher the trash level is, the lower the general boost and identification channel sensitivity should be – ST. Use the “Economy” mode. Remember, high sensitivity does not always mean high search performance. 2. Try to move a coin in close proximity to the search coil. You’ll see that there is one target, but the unit gives three short tones. This comes from the fact that the actual interaction of the DD sensor with a target in the close zone is complicated. What would happen, had there been several objects? It’s obvious that multiple targets located in the close zone are likely to tangle comprehension of the sound and visual information. This fact leads to the important practical conclusion. Do not search in trashy areas with a minimum gap between the search coil and the ground, especially those with the on- surface trash. Choose adequate scanning gaps. In this case they may amount more than 25% of the diameter of the search coil used. 3. Use short sweep technique (5-15 cm) to search for, identify and locate useful targets. 4. The right scanning direction for a group of targets may minimize influence of neighboring objects. Based on the above stated, the most important factor of the «trashy» area search performance shall be your field experience and practical skills.
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 29 Additional menu Sorex Pro has the additional menu extending sound indication capabilities and including ground balancing automatic tuning option. To enter additional menu in any menu press and hold . To browse menu entries press and . To select menu entry and enter the submenu press or . To select the submenu parameter press and . To change the parameter selected in the submenu press and . To exit the submenu and enter the menu, to exit the menu and enter the search mode press . Menu entries: 1. Tone borders (Border 2, Border 3, Border 4); 2. Tone tuning (RT Frequency, LT Frequency, Frequency 2, Frequency 3, Frequency 4, Frequency 5); 3. Add. Parameters (K-filter, K-filter MT, Speed MT). Tone borders In this submenu you can change borders of VDI sound sectors according to your major search targets. Narrowing or widening them you can achieve sound recognition of the group of targets common to your search area. To exit the submenu press . Tone tuning In this submenu you can change tonality of identification signals comfortable for your ear. The bigger number is, the higher the tonality goes. The lowest tonality corresponds to the iron, the highest one corresponds to large high-conductivity metal objects. When you change the tonality we suggest you to consider that the tonality of the threshold tone has its own separate value. It is not recommended to assign this or close tonality to any group of targets, otherwise its identification signal will merge with the threshold tone signal and it would be indistinguishable against such background. Add. Parameters (additional parameters) These parameters are introduced for additional test by developers and any change of these parameters without prior consultation may lead to errors in device operation. Quick review of settings status. If you the device had been idle for a long time and you do not remember the status of its settings, this signature option will help you. This option lets you check settings of the device immediately.
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 30 Hold the button in the operating mode to see settings The status of settings is displayed on the screen depending on two search programs you have selected. Exit settings quick review pressing or automatic exit in 7 seconds. Evaluation of the target size When using the main algorithm MSF the column of the signal duration is shown in the left part of the screen. It renders information on the size of the zone in which the device interacts with the objects. The height of this column may depend either on the size of the object or the sweep speed. Thus, if you train to make sweeps with steady cycles (tempo), the size of targets may be evaluated. Taking into account that the each sweep has its own speed it is very important to evaluate target size only when it is in the middle of the sweep, provided that the target is located under the center of the searchcoil. This option is not active in the M/T mode. It can be explained by specifics of the operation of this algorithm. In trashy areas the evaluation may be incorrect due to several targets in the searchcoil response zone. Troubleshooting In case of any malfunctions, first of all, reset your device to factory settings. Turn off the device, press M button on the panel and turn on the device, holding it till the startup screen appears. You will see a Factory Settings onscreen message. In most cases this reset will solve the problem. Phantom search signals when there is no metal targets are possible in following cases: 1. Incorrect ground balancing. With incorrect ground balancing, when the balance phase (a digit in the left corner of the screen) is shifted to the minus values too much, false responses are possible in the nonferrous metals sector when bumping the searchcoil over mounds and plants. Balance the device accurately or adjust ground phase value by 1-2 degrees in the manual balancing mode pressing +. If the balancing phase is shifted to the plus values too much, false responses are possible in the iron sector. Balance the device accurately or adjust ground phase value by 1-2 degrees in the manual balancing mode pressing -. 2. Weakened contact in the slot of the coil jack in the module. Put the device into horizontal position and tap the unit cable with your finger. If the device responds with sound signals, the problem is in the slot. Slightly force apart pin sections of the unit (approximately 1 mm) and screw the nut tightly. If it did not help, your device is likely to have a defective searchcoil jack soldering, or the jack is damaged and repair is necessary. 3. If a light finger tapping on a coil (see section Searchcoil Replacement) connected to a balanced device such device gives short tone signals, then the searchcoil is defective and subject to repair or replacement. The 15 DD searchcoil may give light phantom responses when bumping over the edges of the coil circle, it is a design feature of the large searchcoil.