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Discriminating Metal Detector

Signum MFT

7272М

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this manual

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Instruction Manual

Summary of Contents for Signum MFT 7272?

Page 1: ...Discriminating Metal Detector Signum MFT 7272М Attention Please read this manual thoroughly Instruction Manual ...

Page 2: ...Селективный металлодетектор Сигнум MFT 7272М Руководство по эксплуатации 2 ООО фирма АКА 7 495 621 0481 http aka 2000 ru aka_md mail ru ...

Page 3: ...PB SENSITIVITY CT VOLUME 9 GROUND BALANCE 10 DISCRIMINATION SEARCH MODE AND SETUP 14 SEARCH MODE ALL METAL 15 DYNAMIC AND STATIC MODES OF OPERATION 16 MODE TURBO 17 MODE ECONOMY 17 MODE S ALGORITHM 17 MULTI FREQUENCY 18 PARAMETER MENU 19 ADDITIONAL MENU ADD MENU 22 USER PROGRAMS 23 USING THE HODOGRAPH FOR IDENTIFICATION 25 SEARCHCOIL REPLACEMENT 26 SEARCH AND IDENTIFICATION METHODS 26 SEARCHING FO...

Page 4: ...nimizing 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 ...

Page 5: ...r ECT 1 ea Magazine for 6 batteries type AA 1 ea Operators Manual 1 ea Headphones 1 ea Carrying 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 Ø260mm DD via RT 25 mm dia coin 60 см 23 5 in Helmet 150 см 59 in Display modes Audio 5 modes RT RT M RT ST RTL ST STP visual LCD display with ...

Page 6: ...ed 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 fig 1 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 recom...

Page 7: ... the device is shown in Figure 2 Sensor coil Electronic unit Grip Armrest Telescopic shaft Socket for headphones Battery compartment Fig 2 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 ...

Page 8: ...imination 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 Pinpoi...

Page 9: ... 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 ...

Page 10: ...raph 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...

Page 11: ...or 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 an...

Page 12: ... 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 ...

Page 13: ...vate 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 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...

Page 14: ...round 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 ever...

Page 15: ...n 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...

Page 16: ... right hand side of the Fig 11 Screen there will appear the letter C and on the left the value of the gain for the static mode along with the ability to change this parameter 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 change...

Page 17: ...play 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 de...

Page 18: ...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 ...

Page 19: ...d by a fast algorithm for the signal processing although there is a nominal loss in sensitivity 30 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...

Page 20: ...reas 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 with...

Page 21: ... 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 overl...

Page 22: ... 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 levels of iron and non ferrous objects In the case of overloading the electronic circuit due to large or s...

Page 23: ...ou 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 c...

Page 24: ...ommended 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 desi...

Page 25: ...ossible 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 comp...

Page 26: ...e paragraph under section Ground Balance Alternatively if a 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 Pressing exits the balancing mode Your device is now ready to work with the new coil Attention All of the above procedures are necessary when maki...

Page 27: ...ular plane of the scan or the coil the device will issue a single low frequency short tone 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 3...

Page 28: ...shows the travel times of these types of signals from an iron bottle cap stopper Normal operating mode 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...

Page 29: ...mail ru 29 Селективный металлодетектор Сигнум MFT 7272М Руководство по эксплуатации As can be seen in Figure 19 the S type algorithm curve has hardly changed Fig 19 Examples of hodographs for some objects are shown in Fig 20 25 Fig 20 Fig 21 Fig 22 Fig 23 ...

Page 30: ...jects and the distance between them Fig 25 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...

Page 31: ...areas with little to no metal trash use the AGT 3 In the 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 Try to 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 d...

Page 32: ...r penny 47 Celtic gold stator 46 50 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 h...

Page 33: ...ill 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 tha...

Page 34: ...Селективный металлодетектор Сигнум MFT 7272М Руководство по эксплуатации 34 ООО фирма АКА 7 495 621 0481 http aka 2000 ru aka_md mail ru ...

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