Aka Sorex 7281 version 104 User Manual
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AKA LLC Moscow Selective Metal Detector SOREX 7281 - light - portable - multifrequency - supersensitive - fast - multipurpose Operating manual Version 1.01F and 1.04F For Sorex 7281 product support and discussions visit http://www.reviewdetector.ru Warning! Read carefully before use.
Selective Metal Detector «Sorex» 7281. Operating manual AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 2 Content CONTENT ........................................................................................................................ 2 GENERAL GUIDELINES .................................................................................................... 3 PRODUCT FEATURES. ..................................................................................................... 3 DELIVERY SET ................................................................................................................. 4 SPECIFICATIONS ............................................................................................................. 4 GETTING STARTED .......................................................................................................... 5 POWER SUPPLY .............................................................................................................. 5 CONTROLS AND CONNECTIONS. ..................................................................................... 5 CONTROL BUTTONS. ...................................................................................................... 6 DEVICE SETTINGS............................................................................................................ 6 «М» MENU. ................................................................................................................... 6 «A/V» MENU .................................................................................................................. 8 «S» MENU. ................................................................................................................... 11 GROUND BALANCING ................................................................................................... 13 DISCRIMINATION SEARCH MODE SETUP ...................................................................... 17 POSITION OF SOME METAL TARGETS ON THE VDI SCALE(FOR 7 KHZ SEARCH COILS). .. 18 DISCRIMINATION SECTOR SETUP. ................................................................................ 19 “ALL METALS” SEARCH MODE ...................................................................................... 19 STATIC MODE (PIN-POINT) ........................................................................................ 20 SEARCH COIL REPLACEMENT. ....................................................................................... 20 VISUAL IDENTIFICATION TOOL - HODOGRAPH ............................................................. 21 THE ADVANTAGE OF HODOGRAPHIC INDICATION OVER VDI ....................................... 22 MULTIFREQUENCY ....................................................................................................... 22 SEARCH AND IDENTIFICATION METHODS ..................................................................... 23 ADDITIONAL MENU ...................................................................................................... 25 TROUBLESHOOTING ..................................................................................................... 26 WARRANTY .................................................................................................................. 27 QA/QC CERTIFICATE ..................................................................................................... 28
Selective Metal Detector «Sorex» 7281. Operating manual AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 3 General Guidelines Sorex 7281 Metal Detector is designed to search for and identify metal objects in dielectric (dry sand, wood etc) and low-conductivity environment (soil, brick walls etc). The device can be used in the following areas: - criminalistics; - engineering corps; - housing and utilities infrastructure, civil construction and firefighting, detection of buried utilities, pipelines, cables, manhole hatches, waterposts, valve caps etc; - archeology and search for buried treasure The device is designed to work in the following conditions: ambient temperature from -5 to +50°С; relative humidity up to 98% at a temperature of 25°С; atmospheric pressure from 630 to 800 mm Hg Product features. Sorex 7281 is a selective eddy current metal detector working on the induction balance. The device is produced in two versions: - version 1.01 powered by one Li battery (type 14500 3,7V); - version 1.04 powered by 4 АА batteries. The key feature of this device is that it is one of our lightest models. Its weight in basic configuration (search coil 6х10”DD-14) is approximately 1 kg (version 1.01). Another Sorex 7281 key feature is an on-board hardware/software automatic customization adaptor for any search coil we produce regardless of operating frequency or search coil size. The distinctive feature of the model is the original spatial filtering technology (SFT) that allows minimizing interference of soil Ferro-oxides (mineralization) and therefore improving identification of deep and small-scale objects. Dynamic mode is the main search mode of the device, i.e. object detection with the constant search coil motion. The device also has a static mode allowing to detection of the exact location of the object (Pin-Point). The device has two types of object detection indicators: - multimode programmable sound, - visual (hodograph, VDI (Visual Digital Index), signal rating (level). The device has two independent search channels: RT and ST RT channel (real-time) is a detection channel and it works on a real time basis, i.e. sound indication is synced with the search coil sweep above the object. In this channel sound indication is a single-tone signal and its volume and frequency may change when the search coil is near the object, and highest values appear above the center of an object. The size of the object may also be estimated by the sound time value from the object.
Selective Metal Detector «Sorex» 7281. Operating manual AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 4 When the object signal in the RT channel exceeds the set-up threshold, the ST channel turns on. The ST channel (short tone) is the object type identification channel. Once the threshold of the object signal level is exceeded, it is identified in the ST channel and followed by the appropriate tone signal, and the display shows the hodograph. Short tone frequency identifies object type (high tones - nonferrous metal, low tone - ferrous metal, default - 5 tones). Each channel has its own independent sensitivity control - ST Sensitivity and Threshold volume tone. Delivery set • Electronic module 1 item. • Search coil DD 6X10” with rod 1 item. • Shaft* 1 item. • Arm rest 1 item. • Battery (Li-Ion, 3.7V)** 2 items. • Charger** 1 item. • Bracket*** 1 item. • Headphone** 1 item • Carrying bag** 1 item • Search coil protector**** 1 item _________________________ *) the device may be equipped with extendable arm providing no-disassemble portability option **) only for version 1.01 ***) electronic module bracket hanger in the arm rest zone for better mechanic balancing of the device (sold by supplementary order) ****) sold separately or in supplementary order. Warning! For additional accessories and search coils visit our website www.aka.2000.ru Specifications Maximum detection range of metal objects (in the air, search coil 6X10DD - 14 kHz) ST channel: - coin Ø25 mm (brass), without electromagnetic interference - 38 cm; Operating frequency range (version 1.01F), kHz - 2…20; Operating frequency range (version 1.04F), kHz - 1…22; Power supply (number of batteries, type, voltage): Version 1.01 - 1, type Li-Ion, 3.7V; Version 1.04 - 4, type АА, 4.8-6V Runtime: - Li battery 3.7V 900 mAh (version 1.01) - 7-8 hours; - 4 batteries 2800 mAh type АА (1.2V) - 20-40 hours; - 4 batteries type АА (1.5 V) - 10-20 hours. Dimensions, (package) mm: - 520х170х85; Weight (without batteries): - 950 ±5% g.
Selective Metal Detector «Sorex» 7281. Operating manual AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 5 Getting started Assemble metal detector. To assemble: - attach arm rest to metal shaft with two screws. - attach search coil to the internal (plastic) rod; - insert rod with the attached search coil into the metal shaft for the required length using latches and holes in the shaft; - tighten collect clamp; - wrap the search coil cable around the shaft evenly and tightly (loose cable may cause false signals); - attach electronic module to shaft skids. - connect search coil slot to the electronic module WARNING! Do not overtighten attachment and mounting fittings of the telescopic shaft. This applies especially to the plastic screw of the search coil and collet Power Supply Depending on the hardware version the device may have either Li type 14500 (version 1.01) or 4 AA batteries (version 1.04). Battery discharge control system automatically switches the device into power saving mode when voltage is less than 3.1V (1 Li power supply variant) and 4.2V (4 AA batteries variant). WARNING! Please insure that the battery (batteries) is properly installed (installation polarity is shown on the battery compartment). The device can be damaged in case of wrong polarity or power supply voltage. Controls and connections. LCD graphic display, headphone jack and 7 detector control buttons are located on the front panel of the device (see picture). Search coil slot, on/off switch and battery compartment is located on the rear panel of the unit.
Selective Metal Detector «Sorex» 7281. Operating manual AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 6 Control buttons. «all metals». Switch between "discrimination and all metals modes «balance – S menu». Automatic ground balancing On. Switch device to manual ground balancing mode pressing one more time. Switch to S menu holding the button. «M menu». Pressing this button enter the main settings menu. «plus». Change values in settings mode. Warning! In search mode is used for on the fly change of sound indication type RT-ST / RTT-ST (РВ-КТ / РВП-КТ). minus Change values in settings mode. Warning! In search mode is used for the on the fly switch between norm 1 and met. trash modes. «search – static» . Used to turn on/off of the static search mode (pinpoint). Also exits settings modes (menu, ground balancing) in the search mode. «audio – video menu». Enter audio and video settings of the device. Device Settings Warning! All changed settings remain in the device memory after the switch- off; the device switches-on with latest settings. All device settings are changed pressing and . Exit settings mode pressing . «М» menu. Enter M menu and browse its entries pressing several times on the device panel. Set up parameters - pressing and . Press for exit or automatic exit 7 seconds after the end of the setting. Menu entries. 1. Sensitivity 2. Threshold tone. 3. Search conditions. 4. Left discriminator border. 5. Right discriminator border. Sensitivity.
Selective Metal Detector «Sorex» 7281. Operating manual AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 7 This option allows adjusting sensitivity of your device. You may change its value from 0 to 21. Remember, increasing device sensitivity you get search depth increase but it comes along with possible interference from power lines and false responses from the search coil bumping obstacles. Chose appropriate sensitivity at the search area taking into account the formula highest value appropriate for stable device operation in this area. It is recommended to reduce device sensitivity in the areas with a lot of metal trash. Due to strong random noise from a large quantity of surface iron the device is unlikely to detect a coin located lower than this iron; while the depth is tolerable in the clear area (it could be even deeper). At the same time the device may not distinguish small nonferrous object (for instance, a flake [small odd-shaped coin]) located on the same level as the iron or a bit higher, from the total search coil snap including the deep iron. While the device with reduced sensitivity will see this coin because it is not dazzled by the iron below the coin. To sum up all the abovementioned: high sensitivity does not guarantee high search performance. Use this setting as the condition may demand and in accordance with the search target. WARNING! The “Metal Trash” mode has its own sensitivity tuning (see below). Threshold tone. This option allows adjusting sensitivity (detection depth) of the threshold tone of your device. The threshold tone is a detection channel signal informing you of the metal object detected by the device. After detection and during search coil motion the sound volume of the threshold tone increases, the highest value is above the center of the target. Over device operation and acoustic experience gained, the combination of threshold tone and identification signal tone, duration and loudness of threshold tone would give you the full information on the size and relative target depth. Even two-target detection with one identification signal would be possible, but this is an exigeant stunt. We recommend setting the threshold tone sensitivity to 16-17 in clear areas and reducing it to the comfortable level in trashy areas. Maximum values of threshold tone sensitivity exceed device ability to identify target metal. That is why it may be applied for the search of metal objects at depths impenetrable for the identification, when any metal object detection is essential. Search conditions. Search conditions imply presence or absence of such influencing factors as metal trash, rough plants, rugged ground surface (plowland). Selection of Met. Trash mode increases device operating speed as well as its ability to distinguish
Selective Metal Detector «Sorex» 7281. Operating manual AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 8 metal objects earthed close to each other. At the same time the sensitivity and identification reliability for deep targets with weak response, which in any case could not be fully implemented in the trash, are slightly reduced (up to 20% from the maximum). In case of area with rough plants or rough and rugged ground surface (plowland), the search coil will suffer from shock impacts leading to frequent false responses. The Norm FA mode is recommended in this case. FA means additional filtering algorithm in the signal processing system. This mode may also be useful when there is a high level of electromagnetic interference (power lines). But it should be noted that such mode slows down device operation to some extent. In case of absence of aforementioned interference factors we recommend to use the Norm. 1 search mode. Please note! In the search mode switch from Met. Trash to Norm. or Norm FA pressing . Left discriminator border. Use buttons and to set up left discrimination sector border. All targets with VDI, as well as hodographs, located to the right of this border, will give the sound signal when they are detected by the device. Targets with VDI located to the left of this border do not give sound response. VDI by regulated border is shown in the frame. Right discriminator border. Use buttons and to set up right discrimination sector border. All targets with VDI, as well as hodographs, located to the left of this border, will give the sound signal when they are detected by the device. Targets with VDI located to the right of this border do not give sound response. Hodograph of the objects cut by the discriminator will be shaded VDI by regulated border is shown in the frame. «A/V» menu To enter «A/V»menu (audio-video menu) and browse its 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.
Selective Metal Detector «Sorex» 7281. Operating manual AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 9 Menu entries 1. Sound Volume 2. Fe 3. Type of video indication 4. Low tone border 5. Weak signal scaling 6. Type of sound indication. Sound Volume. This option allows adjusting 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 adjusting headphone sound volume. Sound Volume Fe. This option allows making 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 convenience. Type of video indication. This option allows switching between types of data display on the main operating screen. 1. Hodograph, small numbers VDI and target rating (top picture) 2. Large numbers VDI and target rating + vectograph. (bottom picture.) VDI (Visual Digital Index) - a digital index with angle size that allows to associate the number with the type of the metal object. Hodographic display of the target signal is the most informative and it becomes very powerful visual identification after some time. We strongly recommend you this particular graphic mode. It has been checked and appreciated by thousands of your colleagues over the last years. But if it is too complicated for you or you got used to the digital display of other devices, you can always switch to the second mode Large VDI. LT (low tone) border. This option allows moving the sound border of nonferrous low tone (LT) to the iron sector by the required value. Its well-known that small objects, especially pieces
Selective Metal Detector «Sorex» 7281. Operating manual AKA LLC+7(495)623-4026 621-0481 http://aka.2000.ru [email protected] 10 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 identifying 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 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). Weak signal scaling (W.S. Scaling) (Масш. С.С.) 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 scales 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. Type of sound indication This option allows changing type of sound indication between RT-ST and RTT-ST. RT-ST is the most informative type of sound indication for the «all metals» operation mode. Threshold detection tone and target identification tone work independently of one another and give 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-ST 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. Please note! In the search mode you can switch type of sound indication on the fly pressing .