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] 11 surface pattern, soil salinity which influence conductivity, searchcoil operating frequency. A higher frequency will cause higher levels of selected filtering. Algorithm (MSF/SSF/MT). This option is meant for quick change of main operating algorithms: MSF – medium speed algorithm for clear and medium-trash areas; SSF – special algorithm with better identification of magnetic properties of objects; Warning! When target is scanned with the SSF algorithm, the scanning searchcoil swings must fully cover target detection zone. M/T (FSF) – fast algorithm for very trashy areas. «A» audio menu To enter «A» menu (audio menu) and browse it entries press several times on the device panel. To set up parameters press and . Press for exit or automatic exit 7 seconds after the end of the setting. Menu entries 1. Sound Volume. 2. Sound Volume Fe. 3. Sound Volume of weak signals. Sound Volume This option allows to adjust device sound volume to your own preference. External speaker turns off when the headphone jack is inserted into the slot on the front panel and this option allows to adjust headphone sound volume. Sound Volume Fe This option allows to make separate adjustment of sound volume for iron only in order to increase comfort and reduce sound overflow in the all metals mode. But this may cause some reduction in sound descriptiveness. Adjust this setting for the sake of your convinience. Sound Volume of weak signals Regulate sound volume weak ST signals from small and deep targets. Low values of this parameter allow to control signal level by the siund volume in wider range of their change. However signals from small and deep objects might be too
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 12 small. That is why this parameter is set up according to practical experience and personal preferences of the user. Maximum sound volume will be similar for all signal levels. «A1» additional audio menu To enter the «A1» menu press and hold . To browse its entries press button several times several times on the device panel. To set up parameters press and . Press for exit or automatic exit 7 seconds after the end of the setting. Menu entries 1. Type of sound indication. 2. ST Type 3. LT border. 4. Startup melody. Type of sound indication This option allows to change type of sound indication of the RT channel (threshold tone) between RT, RTT and RTM. RT is the type of sound indication for the «all metals» operation mode. Threshold detection tone works within the total length of the signal from the object, no matter what the identification channel is (ST), the combination of the threshold tone and ST gives total sound information on the nature, size and depth of the target, but they are notable for high sound overflow that may cause discomfort in trashy areas. In sound indication RTT the threshold tone increases till the moment the device is able to detect the metal the target is made of. Once it is done, the threshold tone cuts down and the separate identification signal sounds. This mode is less informative, but it is more comfortable and has no sound overflow. In this mode the threshold tone may be turned off completely by decreasing its sensitivity to 0 in the M menu when needed. RTM sound indication type is a multi-tone signal of the detection channel (RT). Its specialty is the real-time sound indication with the searchcoil approaching the target, but unlike usual single-tone detection signal, this type of sound is based upon multi-tone principal, which depends on the signal VDI. In other words, the detector tries to identify a target as early as the searchcoil approaches the target. The described indication type is an additional one. It may be useful in case of big signals from targets, for instance, in trashy areas. ST Type
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 13 This option allows to change type of sound indication of the ST channel (short tone) between RT, PST and MST. ST is the type of sound indication for the «all metals» operation mode. Threshold detection tone works within the total length of the signal from the object, no matter what the identification channel is (ST), the combination of the threshold tone and ST gives total sound information on the nature, size and depth of the target, but they are notable for high sound overflow that may cause discomfort in trashy areas. PST (polyphony short tone). For example, signal vectors of nails are located in left corner of the screen. They have negative VDI. Signal vectors of coin-shaped nonferrous targets are distributed in the right corner and their VDI is positive. This fact defines the elegance of the sound indication of such targets. Iron - low tone of SI, nonferrous targets - high tone. However, the practical experience proves that there is a range of targets (iron plugs, caps, tin pieces) which have signal vectors (hodographs) either in the left or in the right corner of the display, i.e. signal phases may get any values during scanning from 0 to 180 The idea is to express this fact in the sound indication and make the polyphony short tone - the number of tones with various frequencies which would define this class of objects. This is the essence of the PST. It is obvious that such mode is more informative but it requires more trenchant hearing analysis related to practical skills. MST sound indication type (modulated short tone). This option allows increasing sound indication capabilities, making short tones more informative in weak signal zones. Tone modulation is made by the width of tone burst depending on the object signal length and size of the object itself. The option contribute greatly to the distinctions between false responses of signal indication in the identification channel and signals from the objects. LT (low tone) border This option allows to move the sound border of nonferrous low tone (LT) to the iron sector by the required value. Its well-known that small objects, especially pieces of golden jewelry, as well as nonferrous targets wiped out by the ground mineralization or slightly covered by the iron, quite often may give the iron signal in the minus sector of VDI. But usually they give signal between medium - large iron and foil, and that allows to identify them with no iron catch. Medium-large wrought iron (wrought nails) is located approximately at -45 - 40 sectors of the VDI scale. The foil would be in sectors close to 0, respectively, i.e. sectors 0 to -35 are suspicious and subject to exploration in terms of beach jewel search, search for small medieval crosses or coins on the trash. Having moved the LT border to the required sector you would not miss those targets on the iron signal working in the «all metals» mode. It would give the nonferrous tone despite the minus signal VDI. Pay special attention to the coin arrow or narrow hodograph loop of
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 14 the signal in this sector. There is 95% probability that this is a nonferrous target. Together with the speed of target distinguish in the trash mode this setting will increase your chance not to miss nonferrous targets surrounded by the iron. Select value of the low tone shift taking into account a specific search area, trying to hold it on the edge of the iron common to the area. If you dig the area with an interesting medium-large iron (arrow heads, medieval knives, locks, splinter holders, etc) you may shift nonferrous tone to the medium-large iron sector -45 (maximum possible -50). Startup melody This option allows selection one of two startup melodies of your choice or turn off the startup melody at all. «V» video menu To enter the «V» video menu press and hold several times on the device panel. To browse its entries press the same button several times. To adjust parameters use buttons and . Press for exit or automatic exit 7 seconds after the end of the adjustment. Menu entries 1. Contrast. 2. Weak signal scaling. 3. Storage. Contrast This option allows adjusting display contrast according to ambient lighting and for better visual perception. Weak signal scaling (Zoom weak sig.) This option was brought to increase capabilities of visual hodographic identification. It allows to increase sizes of weak signal hodographs as well as to evaluate the signal level by the size of the hodographic picture. For instance, setting up 1:2 scale you can increase and thoroughly examine a low-signal hodograph. Scaling 1:7 you can evaluate signal levels in a wider range by the size of the picture respectively. Storage (Accumulation)
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 15 When the storage mode is off the display will show only the hodograph of the latest target identified by the device. Once the next target is identified, the previous hodograph is deleted. Mode 2, 3 - the display also saves hodographs from last two or three targets identified by the device. 3 or 2 storage mode is more informative than the off mode, and it allows to identify the target more accurately by means of several hodographs resulted from target scanning from different angles. «S» menu To enter the «S» menu press and hold several times on the device panel. To browse its entries press the same button several times. To adjust parameters use buttons and . Press for exit or automatic exit 7 seconds after the end of the adjustment. Menu entries 1. F button. 2. Economy mode». 3. EMI filter. F button The programmable F button is intended for the quick access to general modes during the search. The following actions may be assigned to this button: - Economy mode switch; - change type of sound indication; - change ST type; - change main algorithm of searchcoil signal processing. Pressing and . Economy mode The key feature of this mode is a shift to a low power consumption resulted from the reduction of ECC excitation current. Besides, this mode allows performing ground balancing more accurately when working at the highly mineralized sea beaches. This mode is recommended for trashy areas where high sensitivity is not required. Warning! Use button to switch the Economy mode on and off (assign the appropriate function first, see above) during the search.
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 16 The appropriate symbol (E) is shown in the bottom right corner of the display when the Economy mode is on). EMI filter (electromagnetic interference). The search near sources of electromagnetic interference is a common problem (overhead lines, pipelines equipped with cathodic protection and so on). There are many FS in such areas and the sensitivity of the device has to be reduced with all the circumstances that follow. EMIF is intended for the neutralization of such FS with the sensitivity preserved. Set up the adequate filtering in the following manner: Increase this level gradually and get comfortable hearing FS minimum from the EMI. Remember that excessive level of EMIF may miss small targets and slow down device operation. Ground balancing Device ground balancing is the most important aspect of the device search settings. Incorrect balancing may reduce search capabilities of the device, causing unstable operation and false responses. Brief description of the procedure. Each object has its own shape, conductivity and magnetic compound, all of them are assumed to be VDI (Visual Digital Index). We remind that VDI is an angle preference, its number equals to the inclination of the signal vector (hodograph on the device display) from the vertical axis. The ground, depending on the mineralization level (presence of iron oxides), covers target signal with its own signal, changing its VDI till it converts small and deep targets, as well as large targets made of high conductivity metals (copper, silver, aluminum), into the iron. The accurate detector ground balancing in the search area is performed in order to reduce the ground influence to the minimum. Major balancing purposes: 1. To make the ground invisible for the device, i.e. avoid phantom signals from the ground with no targets in it. 2. Set up correct (standard) reference system for VDI. Accurately balanced device must cut-out ground signal mathematically and identify the target correctly getting joint signal from target and ground. It should be noted that during air tests the balanced device will keep making correction for the ground ... which is not available at the moment. During an air test it may lead to an invisible large aluminum or copper object (pan, 5 kopeks of Catherine II), if the ground has got too deep into plus. And if this too deep is too big, those targets may be detected as iron ... and the tester might get very frustrated. Or, to the contrary, it would decrease VDI of those targets, when balance gets too deep into minus, and sensitivity to them in the air goes up incorrectly ... resulting in unreasonable happiness and hopes of the tester. Memorize a simple formula: One degree of balance phase change gives VDI change for all targets by the same one degree to the change direction (+ or -). I.e. if you have 5 kopeks of Catherine II detected as iron in the air with VDI -86 instead of
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 17 appropriate +82+84, then your device ground balance was set up by +10+12 degrees more than required for the air test. Ferrite piece balancing is required before the air test of the device. Put the device on the non-metal surface, turn on automatic ground balancing, count to three, and set a piece of ferrite to the centre of the searchcoil surface from the distance of 25-30 cm, finishing the balancing. Puzzled? Lets make it easier: Take a CD and pass it flatwise in front of the searchcoil. If the CD gives vertical hodograph and VDI within -1 0 +1, then the device is ready for the air tests. If VDI of the CD differs from this values then in the manual balancing mode (press twice ) correct the phase of the ground balancing by the difference level and to the required direction. Did the CD get VDI -1 0 +1? Congratulations, your device is ready for the air battle. Balancing Procedure. We would like to bring your attention to the automatic balancing procedure developed by experienced users. 1. Find a metal-free area. You can find it by the threshold tone response in RT-ST mode. On the unbalanced device there is a response to the pure ground, but the sound would be quiet and diffused, without strict localization, while the sound would be sharp and with strict increase above the metal object. Select an area with no localized sharp threshold tone increase swinging the searchcoil 5-10 cm to the left and to the right above the ground. If there is no localized sharp threshold tone increase, it is the area suitable for balancing. 2. Having found the metal-free area, raise the coil 30-40 cm above the ground, press , wait for 3 seconds, and move the coil to the ground smoothly but not slowly. Warning! Do not move the coil to the ground closer than 10% of the searchcoil diameter (for the searchcoilØ26 cm – 2-3 cm). It is related to the change in the pattern of the searchcoil physical interaction with the ground in the so-called Close Zone and it may impact balancing accuracy resulting in false responses in clear areas with high values of sensitivity during search. Short tone (thrum) notifies of the finished balancing. If there is no tone or it does not sound during lowering, but sounds when moving up, repeat the procedure with the same formula: 30-40 cm above the ground, 3 seconds, lower the coil to the ground. Follow the ground vector on the screen in the process. It should shape as a strait, slightly trembling line, on the horizontal axis of the scale. If it makes sharp angles or tear around the screen, it means that you are trying to balance on the metal object in the ground. In this case the device may balance but it would be incorrect for the operation, and you will notice it by numerous phantom signals from the ground. If it happened, just rebalance the device in the clear area. If you had balanced mistakenly in the area where
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 18 the auto-tune system got frozen and could not rebalance (extraordinary but possible event), dont worry and turn off the device, turn it on holding + button, similar to the coil replacement procedure (see Searchcoil Replacement Procedure). After you have learned how to choose the balancing area, memorize the approximate balance digit in lower left corner of the screen in the balancing mode. Its sharp difference, especially in same weather conditions, during next balancing may be caused by metal in the ground, and you should change the ground balancing area for your device. If there were a metal object under the coil that had not allowed to make automatic balancing (objects with VDI close to 0; foil, for instance), then the device would give two consequent short tones, with a tonality similar to the iron signal in the search mode, and an exclamation mark in a triangle would popup on the screen with the sound. So, the balancing should be performed in another area. The digital value of the balance level (phase) pops up in lower left corner of the screen when balancing is over, this is the value the device will use to correct the VDI of the target, eliminating the ground influence. Digits, showing ground mineralization level will be displayed in the right corner, in accordance with the device scale. It is worth to mention that every device has a unique average angle of the ground balance phase and may also depend on the technical parameter spread of the searchcoil and ambient temperature. But, taking those values into account, don not forget that your device stays in the automatic balancing mode and it can elect to rebalance by ... a shovel, boots, your partner. That is why, if you want to review device screen and balance numbers after the automatic balancing, press the button one more time , and enter the manual balancing mode to turn off the automatic mode. Letter Р will replace letter А in lower right corner of the screen. To exit ground balancing press several times on the device panel. So, to enter manual balancing mode press buttons two times successively In this mode use buttons and to adjust balance to the required position, swing the coil vertically above the ground (move up 20-30 cm/ move down 3-5 cm), keeping track of the ground vector result getting in line with the horizontal axis of the scale, and device move-up/down buzz should disappear. Incorrect Ground Balance Vector (top picture). Correct Ground Balance Vector (bottom picture). On irregular mineralization soils, for instance on a plow land, the device cannot always be accurately balanced in the automatic mode, because when a vertical balancing is performed, there is one soil under
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 19 the searchcoil (a clod or an air layer) and during scanning these pieces go one after another, sometimes it leads to phantom responses of the device identification channel. At the same time, ground phase digit in automatic balancing operation may differ by 3 degrees on the same place. If you face such problem, perform manual ground balancing in the following way: Find a clear area, 60 cm wide. Go to manual setup mode and making short horizontal search passes (but quicker) with a 50 cm amplitude, 3-5 cm above the ground, you will see a straight ground line on the screen (if it jerks, there is a metal). Upon that, if the balance is incorrect, you will hear a buzz from the ground and onscreen ground line wont be horizontal. Use buttons and to make it horizontal, the buzz will stop, your device is balanced accurately. To increase the identification depth of large silver and copper coins (samovars, bowls and other large objects made of high conductivity metals) slightly, after the automatic balancing, it is possible, in the manual ground setting mode, to adjust the digit of the balance phase by 1-2 degrees to the minus values. Great adjustment (or drift) of the balance to the minus will lead to false responses with nonferrous signal, when bumping the coil over the ground and plants. Drift or correction of the ground balance to the plus would lead to low sensitivity to large copper coins (5 kopeks of the Catherine II), such objects may even become invisible and give iron response. If, by any reason, there is no clear area found, the balancing may be performed on a slice of excavated soil (1-1.5 kg), with all metal objects removed from it and having it in a plastic bag for the sake of convenience. After that fix the device and have its coil at the distance of 40-50 cm from the ground (put it on a bush, rest it on a tree with a coil on top), turn ground balancing pressing , count 1,2,3, and move the ground to the coil smoothly but not slowly from the 30-40 cm distance from the external or operating side. (Similar to automatic balancing in the usual mode, but this time the soil has to be moved, not the coil) It is not recommended to put the device on the ground for such balancing. Warning! If the ground signal is weak (quartz sand) to the extent that the balancing program cannot run, it is possible to balance the device using a ferrite piece or a red brick fragment automatically, putting them on the ground. Actually, an air test balance is suitable on such ground and even with balance adjustment by couple degrees to minus in order to increase sensitivity to large targets, if they are expected. Sharp temperature changes on the searchcoil may impact balancing accuracy, the balance may shift and become incorrect with such changes. That is why, if you take the device from a heated car and start working in a low temperature conditions (early spring, late fall), rebalance one or two times while the coil adapts to the ambient temperature. The t icon on the right corner of the screen will tell you that since the last balancing the
Selective Metal Detector SOREX PRO. Operating manual. AKA LLC +7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 20 temperature of the searchcoil has changed by the value (approximately 8° С) which requires ground rebalancing . In case of significant temperature drops (more than 15°С against normal +20°С) we recommend to perform electronic module and searchcoil adaptation procedure one more time (see Searchcoil Replacement). In this case the processor of your detector will choose the optimum frequency of the excitation current for these temperature conditions. Thereby all basic device parameters are sure to be kept, including absorbed current. In sea beach operations and other complicated soils with high conductivity we recommend to use the General Boost option for better balancing accuracy. Sometimes parameter decrease allows making balancing operation more accurate. Especially on sea beaches. Discrimination search mode setup Discrimination is device capability to respond to one type of objects, giving detection signal while ignoring other objects the operator is not interested in, for instance, nonferrous object signals only or large iron objects (helmets, kettles, buckets), ignoring small and medium iron trash (nails). This capability increases search comfort, but one should remember that a valuable object may be missed in this mode. Anyway, you get to choose. The discrimination range of your device is set up by the allowed width of the search sector (a VDI sector between left and right borders of the discriminator). When the discrimination mode is on your device will respond to objects with a VDI and hodograph located within the allowed response sector only. For example, sector covering almost all nonferrous objects and large-size iron objects (helmets, plow pieces, kettles etc), and ignoring small, medium and medium-large objects made of iron, will have the range of -30…+88. Sector with shotgun pellet, foil ... and small pieces of jewelry, crosses blocked, will have the range of +10…+88. Sector basically generated for the search for copper and silver coins of the Russian Empire ... and other valuable objects blocked (crosses, flakes, golden 5 and 10 rubles coins of Nicholas II and others) will have the range of +50...+86.