Aka Signum MFT 7272M version 1.00.c
Contents
1. 7272M an 7272M Sets the sensitivity of the ST short tone channel Sets the sensitivity of the threshold RT channel Real Time Sets the volume of the audio Select the Discrimination edit mode Switch between all metals discrimination Navigate through the menu and change the settings also turns the Turbo mode on off Move through the menu and change the settings as well as turn on off the S Algorithm Switches between User Programs Access the Ground Balance modes Confirms the selected settings Selects a menu item In search mode switches between Static and dynamic Pinpoint modes In ground balance mode switches between Auto and Manual GB Button to enter the Main Menu AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 7272 DISPLAY SCREEN In search mode the display device displays the Hodograph information of detected objects and information about the current operation modes Fig 5 VDI Number Signal level Battery charge level d T T Turbo mode is enabled see page 14 a A enabled auto adjustment ground balance see page 17 1 C Static Mode enabled pinpoint see page 13 S S Algorithm2. 32 WARRANTY INFORMATION 333 QA QC erre ee rre nnn nn nn n n rrr nnn nnne n nen nun en rr 34 AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 3 7272 GENERAL INFORMATION Metal detector SIGNUM MFT 7272M is designed to search for and identify metal objects in the dielectric dry sand wood etc and low conducting media soil brick walls etc Some applications of use are Criminal Engineering Housing and community services construction and fire fighters to search for underground utilities pipelines cables manhole wells etc Archaeology and treasure search The device is designed to operate under the following conditions Ambient temperature from 20 up to 50 4 to 122 F Relative humidity up to 98 per cent at temperature of 25 c 77 F Atmospheric pressure from 630 to 800 mm Hg GENERAL DESCRIPTION The Signum MFT 7272M is an eddy current selective metal detector that works on the principle of induction balance The main distinguishing feature of this model is the use of its original software and hardware Our multi frequency techno
3. AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru
4. eee eere eon er rn 14 SEARCH MODE ALL METAL LLL LLL LTMMMMMMMM MM M MMM 15 DYNAMIC AND STATIC MODES OF OPERATION eee e LLL 16 MODE RRA A 17 MODE 5 5555555555 17 MODE S ccr rere er ree nre n n rrr rrr nnn e 17 MULTI FREQUENC Y rr rn rn n rrr rrr 18 PARAMETER MENU 22e oe eee ern n n rrr nnn rrr n n nnnm e 19 ADDITIONAL MENU ADD MENU oe ene n n rrr 22 USER PROGRAMS e n n n n n rn nnn nnn nnn nn n 23 USING THE HODOGRAPH FOR IDENTIFICATION ennenen 25 SEARCHCOIL REPLACEMENT LL LLL LLL LT LT MTM MITIS 26 SEARCH AND IDENTIFICATION METHODS 26 SEARCHING FOR LARGE FLAT NON FERROUS TARGETS WITH A HIIGH VDI ANGLE G 30 EXAMPLES OF SOME COMMON TARGET VDl S
5. AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 7272 Thus any decision to dig or not dig likely trash target is a compromise between comfort verses the loss of valuable finds And who knows maybe 99 times you dig a trash target but on the 100 time the same VDI rated target will turn out to be a valuable find Attention When using a search coil with a low frequency excitation current VDI readings will have lower values Conversely for higher frequency the VDI readings will be higher WARRANTY INFORMATION Manufacturer guarantees operational capability of the metal detector provided that the consumer follows operation conditions Warranty period 24 months starting from the sale date Manufacturing defects shall be repaired by the Manufacturer during the warranty period free of charge provided that there is no damages in electronic module and searchcoil This Operating Manual with the sale date mark should be provided together with the device in case of warranty repair Warranty period is calculated from the date of manufacture in case there is no sale date mark Address for claims AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 33 34 MFT 7272M
6. under section Ground Balance Alternatively if a PHASE 88 GS 0007 section of clean ground cannot be located perform Fig 15 the balance procedure using a piece of ferrite or red brick Refer to the instruction pertaining to this under the section Ground Balance t Pressing C the balancing mode Your device is now ready to work with the new coil Attention All of the above procedures are necessary when making changes to the software version flashing If your unit is equipped with several periodically used coils we recommend that you in the case of a shutdown e g seasonal before starting the search to restart the detector i e to avoid confusion to adapt the electronic unit to the sensor coil SEARCH AND IDENTIFICATION METHODS When scanning the ground move the coil smoothly over the surface of the ground while maintaining a constant distance of 2 3 cm This distance is optimal from the viewpoint of suppressing the influence of ground mineralization and hence for the proper identification of the metal objects Avoid touching the ground with the coil It is important that the distance between the coil and the ground remain constant see Figure 16 Keep in mind that the quality of this operation has a direct impact on the correct identification of desired targets Also try not to make sudden movements of the coil horizontally Optimal scanning speed is 40 50 cm s Each pass of the sensor should overlap the previous o
7. brightness of the screen The far left light indicator corresponds to the complete shutdown of the backlight Remember that too much backlight level reduces the operating time of the battery life Contrast Sets the desired level of contrast of the display Accumulation 1 4 Option allows you to store the display from 1 to 4 hodograph images simultaneously Displaying multiple hodographs may be useful for example in the analysis of responses from the same target while scanning from different angles or directions 20 AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 7272 Zoom WS Zoom weak signals 1 2 1 4 1 7 This option was designed to increase the 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 to the 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 SOUND SETTINGS Sound Mode RT RT M RTL ST RT ST ST P There are 5 types of sound modes RT Real Time n this mode the audio output is in sync with the movement of the coil As the coil approaches the target the audio rises and as it leaves th
8. levels of iron and non ferrous objects In the case of overloading the electronic circuit due to large or shallow targets under the coil the device will issue an audible and visual alarm overload DUERLDRD ADDITIONAL MENU ADD Menu The menu is in addition to the main options menu this sub menu extends the capabilities of the sound and the display options as well as an option to adjust the auto tuning of the balance to the soil To enter the sub menu E pus hold down Navigate the sub menu options by using the buttons and 44 Selecting a menu item and enter the submenu by pressing the button navigate the parameters of the s selected sub menu by the buttons 57 and BB to select an en use the button change the values in the selected parameter use buttons oO m and ro exit the sub menu press MENU OPTIONS 1 Tones Settings RT Border 2 Border 3 Border 4 Freq RT 2 Tones settings ST Frequency LT Freq 2 Freq 3 Freq 4 Freq 5 22 AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 7272 3 Other Settings Duration ST Economy Mode GS Filter Rate MM EMI Filter TONE SETTINGS RT In this menu you can adjust the audio VDI boundaries for the RT tones to suit your particular needs As well as adjusting the frequenc
9. options are designed to optimize the operation of the device under normal conditions under various degrees of trash within the search area as well as under various amounts of electromagnetic interference Trashy is defined as an area where the distance between small metal objects nails is 1 2 the diameter of the coil To work in these areas use the MM Otherwise we recommend you use the mode Normal Mode MM is characterized by a fast algorithm for the signal processing although there is a nominal loss in sensitivity 3096 When searching in areas of tall vegetation or in plowed fields with an uneven surface it is inevitable that bumping of the coil will occur In these situations it is recommended that you use the search modes AF1 AF2 AF3 where AF indicates the presence of an additional filtering algorithm of the signal These modes can also be useful in areas with high levels of electromagnetic interference EMI However it should be remembered that such filters may slow down the detector process speed Which AF mode is best will depend on user experimentation in the local area DHR Discrimination of hot rocks On Off This option includes the ability to suppress the sound response in the ST channel to the hot rocks HR We can describe these as rocks with a high ferrous content Because of the physical features of the interaction of the Coil with the HR the reaction to them is often confused with the reaction to l
10. the hodograph examples given are idealized and do not take into account the effect ground mineralization AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 25 7272 REPLACING THE COIL Attention Before you replace the coil find a clean section of ground because after a coil replacement a ground balance is required Or if a clean place cannot be found have a piece of ferrite or use a piece of red brick Secure the desired coil on the rod wrap the wire around the rod and plug the connector into the control box Hold the device at a distance of half a meter between the coil and the ground and away from metal objects turn on the unit while holding down the button on the instrument panel Keep the button pressed until the detector stops playing the melody and the screen for a short time will display the value of the working frequency of the coil Attention The exact frequency displayed can vary depending on the coil and software and is automatically calculated by the device For example a Coil with a frequency 7 0 kHz can vary 20 Hz After this your device will automatically navigate into the ground balancing mode Fig 15 Perform the auto ground balance on the clean area of ground you located prior to changing the coil Refer to appropriate paragraph
11. you may use the discrimination mode and set your sector boundaries at 86 to 86 respectively This will act much the same as all metal accept with the elimination of the hot rocks You may also use the algorithm suppression Disc of Hot rocks see page 15 AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 15 7272 DYNAMIC AND STATIC MODES Dynamic mode is the main mode of operation of the detector It is characterized in that the processor constantly adjusts to relatively slow changes in ground conditions Therefore in this mode the instrument responds to the desired objects only when moving the coil If the coil is stationary over an object then after a while the sound will disappear This is the primary mode your detector is in every time you turn it on Static mode is used as an additional and serves mainly to clarify the location of the found object Pinpoint Unlike dynamic mode there is no constant adjusting and therefore it is not intended for a lengthy search To switch the appliance from the basic search mode to static mode Pinpoint In the right hand side of the Screen there will appear the letter and on the left the 5 E 9 Fig 11 value of the gain for the static mode along with the ability to change this para
12. Discriminating Metal Detector Signum MFT Attention Please read this manual thoroughly Instruction Manual 7272 AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 7272 Contents GENERAL lt 4 GENERAL DESCRIPTION OF THE 4 PACKAGE CONTENTS 22 n2nnnnnnnnsnnnnnnnnnnnnnnnennnnnnnnnnnnnannnnnnnnnnnnnnnnnnnnnnnnnnnnnns 5 TECHNICAL SPECIFICATIONS 22 nnennnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnen 5 GETTING 22 1121 6 POWER 6 CONTROLS AND CONNECTIONS 7 DISPLAY SCREEN ener recen rrr n mme 9 SENSITIVITY CT PB SENSITIVITY CT VOLUME 9 GROUND cree rr eren n nn n n rrr nnn nnne nnnm n nnn rn rrr rrr 10 DISCRIMINATION SEARCH MODE AND SETUP
13. am the angular difference between the signal and the signal of large copper silver coins is about 7 8 degrees At the same time the angular difference between hot rocks is only 4 5 degrees which leads to difficulties in the identification of such targets In view of the above it is possible to give some practical recommendations 1 Asaccurately as possible carry out Ground Balance 2 Inareas with little to no metal trash use the AGT 3 Inthe presence of hot stones when not using the DHR algorithm carefully open up the right border of the sector discrimination to minimize the risk of missing these types of coins 4 Tryto adjust the vector phase of the soil by 2 3 degrees in the counterclockwise direction specific value selected experimentally in Depending on the type of soil To do this perform the automatic ground balance procedure V Then press the button Wto enter into manual ground balance mode and adjust the balance value 2 3 times by pressing EE then check the response of the detector when scanning area clean This procedure requires a more careful scanning of the soil In the case of false positives channel identification ST reduce the angle of the phase by pressing button until their disappearance When searching on the wet grass dew rain there is an increased risk of false signals in the ST channel This effect manifests itself mainly due to the setting of high values of sensitivity in the ST cha
14. arge copper or silver coins This algorithm helps to distinguish between these two types of responses and to eliminate the audio response to the Hot Rocks AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 19 7272 Optionally the software be switched off The inclusion of DHR is reflected on the screen in the form of an inscription of HR in the upper right hand corner under the low battery indicator Reaction to these in the RT channel remains Attention The algorithm is turned off automatically in the program MM1 and MM2 Speed of Auto tracking AGT off 1 6 This option allows you to set the speed limit of the auto tracking of the ground not to be confused with balancing on a ground Auto tracking allows the device to automatically adjust to the slow changes of temperature and salinity of the soil It should be noted that this action should in no way replace the procedure for ground balancing and only adjusts the balance of soil in small amounts during the search In some cases large amounts of metal trash or a cluster of hot stones APB may not work properly In these circumstances you should disable the APB Attention If the device has not been used for a long time for correct operation of APB it is necessary to ground balance Gain 1 10 This paramet
15. coin and nail are in the same plane SEARCHING FOR METAL OBJECTS WITH LARGE EDDY CURRENT LOOPS These types of objects include for example large copper silver coins and other large planar objects of non ferrous metals with a diameter greater than 40 mm Due to the particular interaction between the search coil and these types of targets certain difficulties arise This is due to the very narrow difference between the vector angle of these targets and those of the ground signal LARGE COPPER COIN 40MM HOT ROCKS VECTOR OF THE GOUND SIGNAL Fig 26 30 AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 7272 This useful component of the vector is the projection of AB to the vertical Y axis The smaller the angle difference between the ground signal vector and the vector of the coin the less useful part of the projection of the signal and the less sensitivity More important is the fact that the angular difference becomes even less with the so called hot stone see fig 26 In these cases even a minor incorrect setting of the ground balance can lead to a significant loss of sensitivity to the large copper silver coins or an undesirable annoying response to hot rocks if the algorithm DHR is not used Note that when setting the ground balance such as on lo
16. der sector is highlighted by a rectangular frame fig 10 26 To change the position of the border sector use the search buttons and To set up another border sector fig 10 Click v As already noted the discrimination mode due to the influence of the soil there is a risk of missing objects if the search sector borders are set too narrow Hl 3 To exit discrimination click lt SEARCH MODE Metal Using the search mode all metal as opposed to discrimination mode you detect any metal objects whether they be ferrous or non ferrous Which mode is best to use is a personal preference However it should be noted that searching in the discrimination setup can miss some of the weaker signals from good targets This is due to the effect of the soil on the vector signal of the target and causes the signal to go beyond the search vector boundary The disadvantages of the all metal mode can include difficulty working in trashy areas due to the extreme amount of signals and sounds received Since the sector boundaries in the all metal mode are fully open it may be full of signals from so called hot rocks The detector will issue high pitched signals from these objects This is useful for finding stones of meteorite origin Identifying these hot rocks can be done by noting the high ratings from the VDI 86 and the stretching of the signal If these are bothersome
17. e responses in clean areas with high levels of sensitivity A short tone Hum signifies the completed balancing procedure 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 and then lower the coil to the ground Follow the ground vector on the screen during the process Its shape should be a strait slightly trembling line on the horizontal axis of the ground scale AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 11 7272 If it makes sharp angles or is chaotic on the screen this means that you are trying to balance near a metal object in the ground In this case the device may perform a ground balance however it will be incorrect and you will notice multiple false signals from the ground If this occurs simply re balance the detector in an area clear of any metal targets Once you have chosen a clean location to balance the detector and have done so note the value in the lower left hand corner of the ground balance screen Now should you chose to ground balance again later on and there is a sharp difference between this value now as compared to the previous ground balance there is good reason to suspect that there was metal close by and you will need to gr
18. e see Search coil Replacement In this case the processor of your detector will choose the optimum frequency of the excitation current for the current temperature conditions In saltwater beach operations and other complicated soils with high conductivity we recommend you use the Economy Mode option for better ground balance accuracy Sometimes decreasing sensitivity will allow for a more accurate ground balance especially on beaches In rare cases such as after replacement of the coil or attempting to balance on a metal object a situation may arise when you cannot perform an automatic ground balance This occurs because the current value of the phase vector moves out of the locked system acquisition sheet such as a significant change in ambient temperature You can solve the problem by balancing in manual mode To do this while vy in the automatic balancing press the e to go to the manual mode and using the buttons and nN get the vector of the ground signal moving from left to right in strictly the horizontal direction After that the balancing procedure will operate normally DISCRIMINATION SEARCH MODE AND SETUP Discrimination is the ability of the device to respond to certain types of objects and ignore the others For example you can configure the appliance so that it will respond only to objects of non ferrous metals while ignoring everything else In some cases this allows you to increase the comfort of the sea
19. e audio falls respectively This type of display allows for a maximum depth of detection without any type of audio of the type of the object all targets of a single tone Real Time is used when you want to search for deep targets for example to search for military items RT M Real time Multifrequency This is a single channel RT search mode with tone or audio ID This differs from other audio ID modes in that the ST channel is not used We can think of this as Threshold tone ID Audio response is in real time while searching and can provide more target information than may be available in the ST modes especially under certain target rich environments The number of tones can be set in No of tones and may be set from 2 to 4 RT ST Real Time Short tone This is the preferred sound setting Sound indication of the object occurs in 2 stages Real time sound appears first RT with a medium tone and then after the object is identified the RT threshold tone is replaced by the ST tone of an appropriate frequency The duration of the tone can be changed using the Duration ST RTL ST Real time before the threshold Short tone Along with RT ST this is the other main type of sound indication Different from the RT ST this setting is characterized by the fact that when the ST tone is generated the RT tone drops out This setting will help with audio overload to the user when detecting in trash or in areas with many targets ST P Short Tone Po
20. e is able to adjust the ground balance in the proper direction Bob the coil vertically above the ground rising to 20 30cm dropping by 3 5cm making sure that the vector of the soil is along the horizontal axis and that the hum is gone when raising or lowering the coil Vector of improperly balanced soil fig 7 Vector of properly balanced soil fig 8 PHASE 480809 GS 0000 When working on the ground with uneven salinity Fig 8 such as arable land it is not always possible to accurately ground balance the unit in automatic mode This can be due to the uneven or lumpy nature of the soil This can sometimes leads to false responses from the identification channel this situation the phase of the ground balance can vary by more than 3 12 AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 7272 degrees If you encounter this problem then perform the ground balance procedure as follows Find a clean patch of ground with a width of 60 centimeters Switch to manual ground balance and making short horizontal search sweeps with a width of 50cm at a height 3 5cm above the ground you will see a straight line on the ground the screen if the line jumps then there is metal present In this case if the balance is wrong you will hear a buzz from the soil and the soil lin
21. e on the on the screen will not be horizontal Press and until the line is horizontal and the buzz disappears Your device is fine tuned to the ground For a small increase in the depth of the identification of large silver and copper coins kettles basins and other large pieces of highly conductive metals it is possible after performing automatic ground balancing to enter the manual balance mode and set the GB point from 1 to 2 from the automatic GB reference point Care should be taken when setting the ground balance point either negative or positive When set negative it increases the possibility of receiving false positive responses when bumping the coil on vegetation or the ground When set positive you risk the chance of losing sensitivity to large silver or copper coins that will either become invisible or ID as iron In the event that a clean patch of ground is not found you can excavate a small amount of local soil 1 1 5 kg removing all metal objects and place in a bag for convenience Now lean the detector with the coil facing up against a bush or tree with the coil at least 40 50cm off the ground With the bag of soil in hand you can now and press ET the GB button and count 1 2 3 Then smooth and slow starting from a distance of 30 40 cm present the soil to coil As if doing auto balance on the ground in the normal mode but now you are moving the soil to the coil instead of vice versa Placin
22. el However this can reduce the comfort in searching Recommended settings are 6 7 VOLUME 1 9 This setting adjusts the overall volume of the audio response from detected objects Select the value based upon individual comfort preference The current values of these parameters are displayed on the screen above the relative buttons Fig 6 AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 9 7272 To change any of these settings press the appropriate button The value of the selected option is highlighted on the screen with a rectangle around the appropriate value Press the button Or A to set the required value In order to exit the parameters simply click the button again When neither the RT ST or Volume 4 values are displayed on screen the buttons A will now act as on off modes for the Turbo and S algorithm see below GROUND BALANCE Balancing the device to the ground is the single most important part of the device settings for accurate search results Improper ground balancing can result in decreased responses to targets and may result in instability as well as an increase in false ground signals To explain the basic physics behind the ground balance procedure Every object has its own shape conductivity and magnetic component wh
23. enabled see page 14 4 M Metal Trash mode is enabled see page 16 Number of the current user program 1 4 see page 14 Fig 5 VDI number Visual Discrimination Indication This is the index of electrical conductivity of the object or the angle between the vertical axis and the predominant direction of the hodograph time curve In this case hodographs which are on the left side of the screen have a negative VDI and the right have a positive VDI number The amplitude of the signal from detected objects is displayed in standard numerical units ST SENSITIVITY RT SENSITIVITY VOLUME This section introduces the three main parameters that you ll use most often For each of these settings there is an individual button on the control panel SENSITIVITY ST 1 14 Increasing this setting allows you to increase the depth of targets you re searching for but it reduces the accuracy of identification and increases the risk of false positives The recommended value is 9 10 Warning Setting of the ST sensitivity above 11 and especially 14 can lead to a significant increase in the amount of false positives from the soil in high salinity or when bumping the search coil SENSITIVITY RT 0 9 Adjusts the sensitivity of the threshold or RT channel you hear constantly during the search The value of this parameter is set as a compromise between sensitivity and comfort Increasing this value increases sensitivity in the threshold chann
24. equency 3 kHz can be successfully used on non trashy areas to search for both ferrous and non ferrous targets as well as the spoils of war 7 kHz 15 the average universal frequency for wide range of applications You can search for both medium and small coins as well as the spoils of war This frequency is convenient for terrain reconnaissance 14 kHz Frequency optimized for small and medium sized coins especially when the latter are located on edge This frequency is the best choice for hunting on the saltwater beach 18 AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 7272 PARAMETER MENU By pressing the button you have access to a number of additional parameters which are divided into 3 groups Fig 13 Navigating the menu MATH 11 DETECT SETTINGS 1 DETECT SETE EHG DISPLAY SETTINGS rocks UFF Hutotrackings 2 aln T SOUND SETTINGS Freg shift 13685 DISPLAY SETTINGS 11 SOUND SETTINGS L1 ontras Accumulation 1 Ws l1 zoom Fig 13 By using the buttons 5 e Ml 4 and Q The value the upper right corner of the screen indicates the user program number that you are currently editing SEARCH OPTIONS Conv Search Normal Normal MM metal trash AF1 Filtering algorithm AF2 AF3 These
25. er is used to set the sensitivity of the device in the Real Time and Identification channels at the same time In most cases we recommend that this value is not set to more than 7 Smaller values can be useful for example to search for large objects that are not deep or in trashy areas Shift Frequency 5 the Central frequency of the device 5 This parameter adjusts the operating frequency shift and is designed to reduce the effect of the mutual influence of devices operating in close proximity to each other By adjusting this parameter on both instruments the users can achieve a minimum influence on each other and improve the comfort of working together at close distances without significant loss of sensitivity and identification For a more effective suppression of the mutual influence of two nearby detectors it is recommended to spread their operating frequencies Always remember that nearby operating instruments can significantly reduce the search depth It is best to choose the level of difference between the operating frequencies experimentally by setting the distance between the devices and testing the sensitivity of the devices Remember that the detectors must be located in the same plane which corresponds to their actual relative position during the search Attention After adjusting the frequency shift of the device remember to perform the ground balance procedure DISPLAY SETTINGS Backlight Allows you to change the
26. ffect on the hodograph display of non ferrous targets It should also be noted that when increasing the surface area of iron objects the effectiveness of the S algorithm decreases To switch to this mode use the button the values of the parameters RT and ST sensitivity and volume should be displayed To return to the main search mode press the button again MULTI FREQUENCY You may be interested to know that most of the detectors manufactured in the world will have a comparable sensitivity for example a brass disk with a diameter 25 mm and copper disc at 50 mm despite the fact that the second object is much larger It is also known that small targets coins are detected better at higher coil excitation frequencies The fact is that by the virtue of certain physical laws each target class has its own optimal frequency at which the sensitivity to these targets are maximized In order to give the unit the opportunity to search effectively for both large and small targets many manufacturers produce 2 3 or 4 frequency metal detectors The Signum MFT 7272M allows you to work with coils with the operating frequencies from 1 to 30 kHz thus maintaining acceptable sensitivity to almost any type of target The metal detector can be equipped with the following sensors 15DD 3 7 kHz 9 5 x12 5DD 7 3 14 kHz 10DD 7 3 kHz 6h10DD 7 14 KHz What could be the practical guidelines for choosing a coil with a different operating fr
27. for the type of object detected When the received signal exceeds the threshold of the RT channel the detector issues a short audio tone ST and the screen displays the hodograph vector time curve of the detected object The frequency of the short tone indicates the type of object detected high tones non ferrous metal low tone ferrous metal The number of tones can be specified by the user the default is 4 tones 4 AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 7272 Each channel has an independent adjustment of its sensitivity The sensitivity of the RT and the sensitivity of ST The RT channel has a higher sensitivity than the ST channel and its main objective is to locate the object and alert the operator that there is something there The Signum MFT 7272M is equipped with mode Turbo This is a high coil current mode which is used to improve response from good signals at depth There are also 4 custom user programs The detector is equipped with a manual or automatic ground balance system with the ability to adjust auto track rate APB PACKAGE CONTENTS e The electronic unit with a telescopic pole 1 ea e Search coil eddy current transducer ECT 1 ea e Magazine for 6 batteries type AA 1 ea e Operators Manual 1 ea Headphones 1 ea e Carr
28. g the excavated soil on the ground is not desirable Since you were not able to perform a ground balance previously due to the presence of metal in ground placing the bag of soil on the ground may cause an incorrect ground balance Attention If the signal from the ground is too small such as quartz sand and the auto balance cannot be performed then the balancing procedure can be performed either by using a piece of ferrite or a piece of red brick These can be placed on the ground and the auto balance procedure performed In principle using the procedure for balancing for an air test will also work and you may set the balance point 1 or 2 degrees negative if you are searching for large objects Sharp temperature changes on the search coil 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 In case of large temperature drops of more than 15 C compared to a normal air temp of 20C we recommend that you perform electronic module and search coil AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 13 7272 adaptation procedure one more tim
29. he rod with the sensor in a metal bar to desired length using the tabs and holes in the rod tightly and evenly wrap the sensor cable around the rod Freely hanging cables can Cause falsing connect the sensor connector to the electronic unit WARNING Do not over tighten the attachments and fittings for the telescopic shaft This applies in particular to the plastic bolt for the search coil and shaft collets Thanks to a specially designed three knee construction shafts do not need to be disassembled for transportation simply push the knee shafts into each other all the way and the device is ready to be carried compactly fig 1 fig 1 POWER SUPPLY The device is powered using 6 AA batteries or 6 rechargeable NIMH Rechargeable batteries and charger are not included and must be purchased separately We recommend that you use NiMH batteries from SANYO ANSMANN 2500 capacity VARTA or 2850 Ma h The use of standard alkaline batteries is possible but not cost effective as the rechargeable batteries pay off after 4 5 recharges When using batteries with a capacity of 2500 Ma h continuous operation is approximately 16 hours in the main mode and 6 7 hours in Turbo mode Several recommendations on the use of nickel metal hydride batteries Avoid fully discharging the batteries with each cycle use as this shortens their lifespan Slight memory effect is eliminated by one complete discharge approximately once a month After exte
30. he variety of influencing factors However it is possible to point out some general patterns Earlier we mentioned that the signal is a vector quantity characterized by amplitude and phase If you hold any metal object to the coil it is evident that the magnitude of this vector will vary The end of the vector will describe on a coordinate plane some shapes lines loops etc These shapes are called Hodographs The latter most closely describes the complex interactions of the coil with metal objects When analyzing the hodographs should be remember a few general rules hodographs of small and medium sized ferromagnetic objects are in the left quadrant i e have a negative vector angle e hodographs of objects of non ferrous metals and large ferromagnetic objects lie in the right quadrant positive vector angle e the larger the area of the surface of an object the higher the electrical conductivity hence the greater the slope of the hodograph to the right e travel times of medium and large ferrous objects as a rule have the shape of a loop e hodographs of non ferrous metal objects are mainly straight e a properly ground balanced unit will have a vector along the horizontal axis Examples of the hodographs of some objects are shown in Fig 14 Thus analyzing the shape and position of the hodograph along the coordinate plane there can be a certain degree of probability as to the identity of the object type It should be noted that
31. ich together are called the VDI Visual Digital Index Remember that the VDI is the angular response that is numerically equal to the angle of deflection of the signal vector time curve hodograph display on the vertical axis The soil or ground depending on the degree of mineralization presence of iron oxides imposes its signal on the target signal thus changing the VDI upscale This is especially true on small or deep targets as well as large highly conductive targets copper silver aluminum This can actually push these high VDI targets up and over into the high negative VDI range known as VDI wrap around To minimize this effect it is crucial to perform a proper and accurate ground balance procedure The basic objectives of balancing 1 Make the soil invisible to the instrument i e exclude false signals from the ground where there is no target 2 Install the correct standardized reference system number for the VDI When receiving a signal from both the ground and a detected object the detector must subtract mathematically the signal from the ground in order to display a correct VDI indication of the detected target Keep in mind that when performing air tests inside after the detector has been previously balanced in soil may result in incorrect VDI readings This is due to the correction factor for the VDI previously set in the last ground balance This may result in the loss or invisibility of large aluminum silver a
32. ignificant reduction in the consumption of power in this mode you can run up to 40 hours on a set of fully charged batteries Switching to the turbo is made through the Extras Menu section Extra Settings see below MODE S ALGORITHM From our experience we know that the majority of metal detectors react to flat iron objects as nonferrous To assist in solving this problem the specially developed S algorithm is used to assist in properly identifying these targets The most effective use of this algorithm is in identifying small flat iron objects 15 cm2 such as beer caps rusted pieces roof tin etc with a signal rating greater than 10 If the device detects an object with a questionable non ferrous signal high tone and it has a rating over 10 then using the S Algorithm can help to identify these type targets 7 495 621 0481 http aka 2000 ru aka_md mail ru 17 7272 There is no need to use this algorithm for a definitive low pitched signal i e when the subject is clearly iron Remember though to monitor the signal rating level of the target It should be pointed out that this mode does not apply to general searching but only to help clarify the type of metal of a non ferrous response and to decide on the need to dig The S Algorithm has virtually no e
33. logy MFT allows the use of any search coils manufactured by us regardless of their operating frequency Hz That is the device itself will make adjustments and calibrate to the selected coil The device uses the original technology of signal processing sensor technology space and harmonic filtering SFT minimizing the hindering effect of ferrous soil salinity and thereby increasing the reliability of the identification of deep and small objects Basic search mode Dynamic search mode i e detection of an object occurs with constant motion of the search coil To pinpoint the exact location of the detected object the device has a static mode of operation Pinpoint The device has 2 methods for identifying the object detected Audio programmable multi mode Visual Hodograph VDI value rating level signal RS The device has two independent search channels RT and ST The RT channel real time works in real time i e sound indication is given simultaneously with the movement of the search coil over the object Sound indication in this channel is a single tone signal volume and frequency of which can change when an object approaches the search coil Also using the duration of the tone we can get an estimate of size of the target detected When the received signal from an object exceeds the specified RT threshold the channel generates the ST audio or short tone Channel ST short tone is the audio identification channel
34. lyphonic Ability to give both a low tone and high tones at the same time For example when giving a signal from the small flat iron targets beer bottle caps small pieces of sheet metal etc Num of tones 2 3 4 5 Sets the number of tones for audio identification LT Boundary The boundary for the low tone iron This option allows the user to set the boundary for the low tone In areas of mineralized soil as well as areas with small iron nails targets such as small shallow gold and other low VDI targets will indicate a negative VDI Usually these give a signal between the medium large iron VDI range and foil VDI range These will not fall completely within the range of iron but also not quite at the range of foil For example medium wrought iron targets such as wrought iron nails will have a VDI vector of 45 to 40 Foil will have a VDI vector of or close to this Therefore those targets with a VDI from O to 35 are considered suspicious and subject to research when looking for small gold jewelry small medieval daggers or coins within debris When setting the boundary of the LT remember these facts in order to not miss valuable targets when searching under these conditions So if we receive a good tone even if the hodograph indicates a loop with 9596 confidence we can say that this is possibly a good non ferrous target Together with the separation rate of the MM search mode this setting will increase your chances of not missing a n
35. membered that increasing the value of the filtering level increases the comfort of the search but it can lead to missing deep or highly conductive targets The value of the filtering level should be selected experimentally for each particular detecting situation as it is desirable to keep this setting as low as possible while still maintaining a comfortable search level RATE MM Not fully described This adjusts the setting for the algorithm for targets spaced close together This may be set experimentally Current setting of 5 is recommended EMI FILTER MM not fully described However it appears to be self explanatory USER PROGRAMS The device provides the ability to edit and save 4 independent search programs In each program the user may choose to set the value of any of the available options To switch between user programs press button C The currently selected program is displayed in the lower right hand corner of the display The factory setting values for all 4 programs are shown in Table 1 AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 23 7272 Table 1 Settings 1 1 Prog 1 Prog 2 Prog 3 Prog 4 Sensitivity RT 7 7 BC Volume 9 6 6 6 VolumIT 9 6 L9 9 J Settings Backlight Con
36. meter by using the buttons and fig 11 The gain of the static mode is selected experimentally depending on the specific conditions The choice of this parameter will depend on the relief of the ground littered area temperature changes etc We recommend starting values of 6 7 As already mentioned the active mode pinpoint is used to determine the the exact location of the object Let us give some practical tips on how to Use this mode After locating an object in the static mode and deciding it is worth digging it is time to define its exact location To do this move the search coil off of the approximate center of the target either left or right line A see Figure 12 Then turn on the static mode Pinpoint As accurately as possible while maintaining the distance between the ground and the coil scan the object backwards Determine on line A the location coordinate where the tone of the sound was the highest Connection points in static mode Increase in sound Fig 12 16 AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 7272 Then move the coil away from the target perpendicular to the primary direction A scanning e g forward along this line This retraction of the coil in this direction must pass through the
37. nated by using the algorithm DHR instead As you know a particular problem for induction metal detectors is the identification of flat AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 27 7272 ferromagnetic objects such as steel caps stoppers lids cans etc objects with relatively large diameter of the eddy currents This is largely helped out by using our proprietary development The Hodograph Display see Fig 19 In the interaction of such objects with the coil assuming that the level of the signal is above 20 then time curves of these objects as a rule are twisted or looped in nature and scattered around the screen depending on the direction of the scan Fig 17 shows the travel times of these types of signals from an iron bottle cap stopper Normal operating mode STEEL CAP amp OR 209 Fig 17 To solve the problem with identifying steel caps stoppers you can use the S algorithm which greatly simplifies the process of identification of small up to 40 50 mm flat iron objects If you have received a questionable audio response of an object check using the S algorithm to see if it is a cap Do not forget to monitor the signal level This algorithm works effectively only when the signal level is 10 or higher Analy
38. nd copper targets If the ground setting is too positive the VDI will be offset positive and vice versa if the ground balance is negative 10 AKA 7 495 621 0481 http aka 2000 ru aka mdQmail ru 7272 This may also lead to targets air testing as iron as well as a false increase in sensitivity when air testing Remember that for every 1 degree of ground balance offset from the 0 or neutral point we get a corresponding increase or decrease in the VDI scale for a given target IE a 1 degree ground balance will increase the VDI by 1 For example if you are air testing a large copper coin that would normally give a VDI of 82 to 84 but is now air testing with a VDI of 86 The result is that the device ground balance is set 10 to 12 degrees too positive for performing an accurate air test Balancing with a piece of ferrite is required before performing an air test of the device Put the device on a non metal surface turn on automatic ground balance mode count to three then bring the ferrite to the center surface of the coil from a distance of 25 30 cm 10 to12 to complete the balancing procedure Puzzled Let s make it easier Take a CD and pass it flatwise in front of the search coil If the CD gives a vertical hodograph and VDI of 0 1 or 1 then the device is ready for ai
39. nd we hope that in the near future you will make your own comfortable and effective program 24 AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 7272 As we gain experience the company reserves the right without notice to change the value of the factory settings A very useful practice is to switch between user modes to access changes in menu options A good example of this is changing Backlight settings To do this there are a pair of identical search programs 1 and 2 3 and 4 the only difference is the value of the backlight one pair of programs is on the other is off Further if you need to change the current state of the backlight no need to go to the menu and look for the desired setting You can just toggle the search program USING THE HODOGRAPH FOR IDENTIFICATION We have previously mentioned about using the hodograph for identifying targets But what is the GRENADE hodograph and what it is for The received signal is characterized not only by its amplitude and phase but it is also a vector quantity Amplitude and phase depend on the electro physical parameters of objects Manhole cover such as conductivity magnetic permeability depth geometry etc To accurately describe the Fig 14 nature of the received signal from an object is very difficult given t
40. nded periods of storing the device it is usually good practice to fully discharge and charge the batteries a total of 4 5 times Remember that due to the self discharge nature of the batter capacity falls by About 5 per day so it is advisable to charge batteries before each use DO NOT use rechargeable batteries that have different capacities in the same set WARNING When connecting the battery magazine to the device connector insure the battery is properly connected polarity is indicated on the battery cartridge and insure the voltage source is correct In the case of incorrect polarity or improper voltage the device can be damaged 6 AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 7272 CONTROLS AND CONNECTIONS Appearance of the device is shown in Figure 2 Sensor coil Electronic unit lt lt Armrest a v Battery compartment Fig 2 M Telescopic shaft VLL Socket for headphones On the rear panel of the device are the coil connector on off switch and the serial number of the device fig 3 Located on the front panel are the LCD graphic display with a resolution of 128 x 64 dots and 11 touchpad controls fig 4 Fig 3 AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 7
41. ne 26 AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 7272 Use additional scans to more accurately identify the type of object by centering above the target Sweep the coil through the maximum signal area as accurately as possible maintaining a constant distance between the coil and ground For the same reason scan the target with coil in the direction of the least amount of surface change in the ground In this case the effect of soil will be minimal When the search coil interacts with a metal object there may be a single tone burst or possibly several tone bursts in rapid succession Therefore one should pay attention to the following When the detector responds with a single short high tone and the signal level is rather stable it is a good probability that the targets is not very large and of a non ferrous nature at a depth of more than 5cm On the other hand if the detector gives a series of short high tones usually 3 then the targets is shallow and in the so called near zone less than 5cm The Signal level will also display a value of 50 or greater A series of two short low pitched sounds indicates that in the area of the coil is an extended ferrous object like a nail located along the scanning direction If the object is located along the perpendicular plane of
42. nnel and to the presence of a weak electric conductivity in the dew and plant liquids To a large extent almost completely this effect can be eliminated by placing the search coil in a protective plastic case plastic bag full time protection etc In the case of searching in trashy areas it is sufficient to reduce the sensitivity of the ST channel AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 31 7272 EXAMPLES OF SOME COMMON TARGET VDI s VDI data are for units with a 7 kHz Normal mode Turbo and Economy off and DHR off From 70to 35 large wrought nails medieval knives flat arrowheads horseshoes locks and other fairly large iron articles From 35 to 10 In this sector there is little iron accept those targets that may be masked by iron small objects of irregular shape of the low conductivity of non ferrous alloys bronze crosses thin gold serpentine chain Pay particular attention to the arrow and narrow loop travel times in this sector From 10 to 10 foil small crosses of bronze very small lead fine gold small 22 shell casings From 10 to 30 Hammered short cross silver cut half 22 Roman minim 14 some small thin hammered silver coins US 5 cent nickel 50 pence 24 20 pence 28 small lead shot From 30 to 50 Hammered sh
43. on ferrous target mixed in the iron Try to set the border for AKA 7 495 621 0481 http aka 2000 ru aka md Gmail ru 21 7272 these lower tones appropriately If you perform a search in places where the medium large iron can be interesting Arrowheads knives medieval items etc you can move the non ferrous tone to the sector border where the majority of large iron indicates at 45 50 possible maximum Volume WS Volume of weak signals 1 9 Adjusting this parameter allows you to change the volume of the ST from weak signals from small or deep targets Smaller values of this parameter can control the level of the volume signal for a wider range of target depths However at very low settings signals from small or extremely deep objects can be too quiet Very high settings will reduce the differential volume level between deep and shallow targets Therefore the value of this parameter is selected experimentally to individual user preferences Volume LT 1 9 Parameter adjusts the volume of targets within the setting of the LT border iron Sometimes it is useful to reduce the volume or even mute the sound from iron in order to make the search more comfortable This parameter value is selected based on the personal preference of the user The value of Fe 9 Volume adjusts the volume
44. original coordinate Re enable the static mode Scan the object along the line as accurately as possible keeping a minimum distance between the ground and the sensor The recorded coordinate of the maximum frequency tones sound on line B will determine the exact location of the object To return to the dynamic mode press the button again MODE TURBO In the Turbo mode the search coil operates at the forced excitation current This mode allows you to increase the sensitivity of the device and to improve the immunity of the device from external electromagnetic interference Attention The Turbo mode greatly increases current consumption and as such battery operating time is greatly reduced Switch to TURBO and back by using the button while in search mode It is necessary to ensure that the settings ST RT sensitivity and volume on the display screen are not displayed MODE ECONOMY In the Economy the sensor operates at the minimum excitation current This mode allows you to improve the comfort of your search on soils with a complex and variable salinity for example in the surf of the beach or at locations with extreme iron debris Attention After switching to Economy mode it is advised to ground balance the device For reference the detection range in this mode when air testing a large 43cm copper coin such as a Victorian Penny is approximately 35cm 10 DD coil 6 5 7 kHz Thanks to the s
45. ort cross silver penny 47 Celtic gold stator 446 450 larger lead shot i e musket balls Minnie balls also lead seals Aluminum tabs larger 14K gold rings From 50 to 70 AE antonianus 64 US copper penny US zinc Penny UK pound coin From 70 to 86 Large copper coins cartwheel penny King George coppers Victorian penny UK pound coin US dime Quarter Half dollar and dollars as well as large Planar or spherical iron objects helmets plows axes etc From 86 to 90 ground response from an unbalanced device hot rocks as well as very large objects from deep highly conductive metal e g aluminum basin a large silver tray Hot Stone signals differ in that they sound stretched while the signal from the metal target is usually concentrated in a small point As we can see even in the good VDI sectors we have targets that are trash That is there will always be trash items mixed in with the more desirable targets with very similar characteristics Also do not forget that the purpose of VDI is only true in the area of consistent definition of the instrument and in the absence of other metal objects nearby For example a piece of iron underlying a gold ring will cause the normal VDI of 37 to now read 18 22 And at the limit of sensitivity in the ground it may suddenly sound like a deep copper coin with VDI 85 This is not unique to your device but for all other devices of this type 32
46. ound balance again If the coil all the same was a metal object giving an automatic balance items with VDI close to O e g foil the device will give two consecutive tones similar in tone to that of iron in the search mode while at the same time the screen will display an exclamation point within a triangle Accordingly you will need to ground balance again on a clean spot of land After balancing in the lower left corner of the screen will display a numerical value of balance phase this is the amount by which the device will adjust the VDI excluding the effect of the soil In the right corner of the screen it should be noted that the average phase angle ground balance is different for each instance of the device and can also depend on the technological variability in parameters of the coil and the ambient temperature However do not forget that your device remains in the automatic balancing mode and at any moment may deem it was time to rebalance to your shovel boots or hunting partner If you want to review the results and values of the current automatic ground balance procedure press MEI to enter manual mode and disable automatic balancing In the upper right corner of the screen will appear M instead of the letter A To 1 exit the ground balancing click C3 the instrument panel Switching between modes is as simple as performing successive clicks of While in the manual balance mode by pressing or AY on
47. r tests If the VDI of the CD differs from these values then in auto GB click GB and adjust the phase of the ground balance in the desired direction When the VDI of the CD is at 0 1 1 your device is ready for air testing 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 mode On an unbalanced device there will be a response to the clean ground however the sound will be soft and diffused without a strong localization While the sound would be sharp and with a strong increase in sound above a metal object Select an area with no localized sharp threshold tone increase while swinging the search coil 5 10 cm to the left and to the right above the ground If there is no localized sharp threshold tone increase then the area is suitable for balancing 2 Having found the metal free area raise the coil 30 40 cm above the ground press wait 3 seconds and move the coil to the ground smoothly but not too slow Warning Do not move the coil to the ground closer than 10 of the search coil diameter for the searchcoil 26 cm 2 3 cm This is related to the change in the pattern of the search coils physical interaction with the ground in what is called the Close Zone and it may impact balancing accuracy resulting in fals
48. rch Be aware however that the more discrimination that is used there is an increased risk in missing valuable objects In any event the choice is yours The discrimination range is set to the position and width of the search sector The metal detector will respond only to those objects that have travel time curves Hodographs which fall between the left and Right border sector For example to search for non ferrous objects your sector search screen may look like that in Fig 9 Pressing Button allows the user to fig 9 quickly switch between modes All Metal and Discrimination and then back again The sector on the screen indicates that you are in a discriminatory setup An Audio response will occur only on those objects that fall in the clear Hodograph area while targets that fall within the hatched area will not generate an audio response 14 AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 7272 Disc To configure the discrimination click Now by positioning the left and right edges of the search sector you can set the desired area level of discrimination At the top left and top right of the screen are the current values of the search sector These are in degrees of inclination relative to the vertical axis of the screen The currently selected bor
49. the scan gt 2 or the coil the device will issue a single low frequency CM short tone 2 0 4 0 5 Fig 16 It is important to note that the DD sensor is characterized by a complex pattern when interacting with metal objects close to the coil or the near zone signal levels greater than 80 Therefore when trying to determine the target ID adjust the coil height to a level that will give a signal strength of 30 to 60 in the Turbo mode and from 15 to 30 in the normal search mode In other words if conditions allow try to identify objects above the near the zone Let s us discuss some of the challenges with the so called hot rocks VDI greater than 84 In order to better differentiate between hot rocks and relatively large flat non ferromagnetic objects Large copper or silver coins with a VDI range of 78 to 86 the device uses a special high pitched tone which is different from the usual tone indicated on such non ferrous targets If you desire the signal from hot rocks can be deleted by setting the discriminator sector value with the right edge of the 86 However the most effective means of suppressing the audible reaction on hot rocks is to use the DHR algorithm Disc of hot rocks The risk from using discrimination settings to eliminate an audio response to hot rocks is this Due to effect of the ground valuable targets whose vector angle is close to that of hot rocks can being missed This risk is virtually elimi
50. trast and Cont CT directly with the search capabilities of the device are not affected and can be chosen based on the preferences of the particular user However one should pay attention to two points Unless absolutely necessary do not place a high value for the Backlight setting Doing so may reduce the operation time with one set of batteries Itis also not recommended to set too high a level for the parameter Duration ST when working in trashy areas for a clearer separation of closely spaced targets Factory default values for all parameters are stored in memory and the user can always go back to them To perform this you must first turn on the device while at the Same time holding down the button and hold it until the end of the melody Program 1 is designed for easy and comfortable search of shallow objects Program 2 designed to search in trashy areas Has a good response but slightly inferior in sensitivity Program 3 is the main program of research combining the best combinations for a comfortable search with near maximum sensitivity Program 4 for when you want to search at slightly greater depths however it is worth remembering that it reduces the comfort of searching identifying deteriorating properties of the device as well as the time from one set of batteries is reduced by 2 3 times Remember that the default settings are not an absolute but offered only as a starting point to assist your search Experiment a
51. y of the audible threshold You can narrow or spread out the audio range to fit any particular detecting needs TONE SETTINGS ST In this menu you can change the frequency of the ST border tones to fit your personal preferences The higher the number the higher the pitch The lowest tone corresponds to iron while the highest to the highly conductive metals Please consider when changing the lower ST tone that the tone of the channel RT has its own distinct value adjustable via menu SETTING TONE It is recommended to try and not set the ST tones to the same or similar value as the RT tone as it will become indistinguishable from the latter OTHER SETTINGS Duration ST This parameter sets the level of the duration of the tone bursts in the Sound Modes RT ST and RTL ST The far left position corresponds to the shortest tone duration Economy Mode On Off This parameter switches the current excitation level in the coil and allows you to adjust the sensitivity and power consumption to fit different search conditions see above GS FILTER OFF 1 20 This option allows you to choose the level of suppression of false alarms caused by soil with high electrical conductivity saline soils sea beach etc This is especially important when using a large size 10 and 12 5 x9 5 search coils operating at high frequencies 14 20 kHz due to the characteristics of the interaction of these coils with highly conductive soils It should be re
52. ying Bag 1 ea batteries sold separately purchased separately or as an option TECHNICAL SPECIFICATIONS The maximum detection range of metal objects air test with coil 260mm DD via RT 25 mm dia coin 60 cm 23 5 in Helmet 150 cm 59 in Display modes Audio 5 modes RT RT M RT ST RTL ST STP visual LCD display with a resolution of 128x64 pixels Search modes metals sectored discrimination with 2 step Control modes Dynamic programmable Static with adjustable threshold Power Supply 6 batteries type AA LR6 Continuous operation time 16 18 hours in normal mode 6 7 hours in Turbo mode Rechargeable batteries 2500 up to 40 hours in economy mode Overall dimensions mm e Telescopic rod 1200 Max e Electronic unit 120x70x115 e Search coils 0260 mm 380 mm 150x260 mm 240x320 mm Weight of the device 1300 g without battery The device allows the ability to work in water depths of up to 15 meters without submerging the control box AKA 7 495 621 0481 http aka 2000 ru aka md Qmail ru 5 7272 GETTING STARTED Assemble the metal detector To do this install the appliance in a metal bar tighten the Collet Chuck install the inner plastic rod sensor install t
53. zing these types of questionable targets is made much easier and does not require as much user experience The main job of identifying is performed by the processor Examples of the hodographs for the same cap stopper using the S mode algorithm is shown in Fig 18 S Mode Algorithm di es CAP STOPPER Fig 18 28 AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 7272 As be seen in Figure 19 the S type algorithm curve has hardly changed Fig 19 Without S Algorithm With S Algorithm 20mm Copper Coin lt 20 coin and the coil in the same plane _ Silver coin thin Coin and Coil in the same plane 50mm diameter steel cap cap and coil in the same plane Nail lying parralel to the direction of the AKA 7 495 621 0481 http aka 2000 ru aka_md mail ru 29 7272 Nail lying perpendicular to direction of the scan Fig 24 The example in Fig 25 shows a hodograph for two nearby objects Dimensions of the Hodograph loops will depend on the ratio of the size of these objects and the distance between them 20mm Copper Coin where the coil
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