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AKA T72 Operating Manual

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AKA T72
OPERATING MANUAL
To contact us, ask questions about our metal detectors via our forum, see videos and learn more
about our products please go to: http://www.aka-detectors.com
GENERAL INFORMATION-----------------------------------------------------------------------------------------------2
GENERAL DESCRIPTION OF THE DEVICE---------------------------------------------------------------------------2
PACKAGE CONTENTS------------------------------------------------------------------------------------------------------3
TECHNICAL SPECIFICATIONS---------------------------------------------------------------------------------------------3
GETTING STARTED----------------------------------------------------------------------------------------------------------4
POWER SUPPLY----------------------------------------------------------------------------------------------------------------4
CONTROLS AND CONNECTIONS ---------------------------------------------------------------------------------------5
DISPLAY SCREEN--------------------------------------------------------------------------------------------------------------7
SENSITIVITY CT, PB SENSITIVITY / CT VOLUME----------------------------------------------------------------7
GROUND BALANCE--------------------------------------------------------------------------------------------------------8
DISCRIMINATION SEARCH MODE AND SETUP-------------------------------------------------------------------11
DYNAMIC AND STATIC MODES OF OPERATION------------------------------------------------------------------13
MODE S ALGORITHM------------------------------------------------------------------------------------------------------15
MULTI-FREQUENCY-------------------------------------------------------------------------------------------------------15
PARAMETER MENU--------------------------------------------------------------------------------------------------------16
ADDITIONAL MENU (ADD. MENU)-------------------------------------------------------------------------------------20
USER PROGRAMS----------------------------------------------------------------------------------------------------------21
USING THE HODOGRAPH FOR IDENTIFICATION --------------------------------------------------------------22
SEARCHCOIL REPLACEMENT -----------------------------------------------------------------------------------------23
SEARCH AND IDENTIFICATION METHODS -----------------------------------------------------------------------24
EXAMPLES OF SOME COMMON TARGET VDI's-----------------------------------------------------------------28
WARRANTY INFORMATION ----------------------------------------------------------------------------------------------29
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  • Page 1: Table Of Contents

    AKA T72 OPERATING MANUAL To contact us, ask questions about our metal detectors via our forum, see videos and learn more about our products please go to: http://www.aka-detectors.com GENERAL INFORMATION-----------------------------------------------------------------------------------------------2 GENERAL DESCRIPTION OF THE DEVICE---------------------------------------------------------------------------2 PACKAGE CONTENTS------------------------------------------------------------------------------------------------------3 TECHNICAL SPECIFICATIONS---------------------------------------------------------------------------------------------3 GETTING STARTED----------------------------------------------------------------------------------------------------------4...

  • Page 2: General Information

    GENERAL INFORMATION Metal detector T.72 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.

  • Page 3: Package Contents

    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 T.72 is equipped with mode (Turbo).

  • Page 4: Getting Started

    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 mAh) - up to 40 hours in economy mode Overall dimensions, mm: •...

  • Page 5: Controls And Connections

    -After extended 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.
  • Page 6 Located on the front panel are the LCD graphic display (with a resolution of 128 x 64 dots) and 11 touchpad controls. ST SENS : Sets the sensitivity of the ST (short tone) channel RT SENS : Sets the sensitivity of the threshold RT channel (Real Time) SOUND : Sets the volume of the audio DISC : Select the Discrimination edit mode AM / mode : Switch between all metals/discrimination...

  • Page 7: Display Screen

    DISPLAY SCREEN In search mode the display device displays the Hodograph information of detected objects and information about the current operation modes. 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).

  • Page 8: Ground Balance

    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.
  • Page 9 If the VDI of the CD differs from these values, then in auto GB click OK (to enter manual GB) and adjust the phase of the ground balance in the desired direction. When the VDI of the CD is at 0 (+1 or –...
  • Page 10 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.

  • Page 11: Discrimination Search Mode And Setup

    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”...

  • Page 12: Search Mode "All Metal

    of the search. 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.

  • Page 13: Dynamic And Static Modes Of Operation

    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.

  • Page 14: Mode "Turbo

    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 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.

  • Page 15: Mode "Economy

    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”...

  • Page 16: Parameter Menu

    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 –Is the average universal frequency for a wide range of applications. You can search for both medium and small coins as well as the spoils of war.
  • Page 17 Mode MM is characterized 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"...
  • Page 18 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.
  • Page 19 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.

  • Page 20: Additional Menu (Add. Menu)

    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.

  • Page 21: User Programs

    It should be remembered 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.

  • Page 22: Using The Hodograph For Identification

    - It is 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.

  • Page 23: Searchcoil Replacement

    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); • hodographs of objects of non-ferrous metals and large ferromagnetic objects lie in the right quadrant (positive vector angle);...

  • Page 24: Search And Identification Methods

    After this, your device will automatically navigate into the ground balancing mode. Perform the auto ground balance on the clean area of ground you located prior to changing the coil. Refer to appropriate paragraph under section “Ground Balance”. Alternatively if a section of clean ground cannot be located perform the balance procedure using a piece of ferrite or red brick.
  • Page 25 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.
  • Page 26 S-Mode Algorithm As can be seen above, the S-type algorithm curve has hardly changed. Examples of hodographs for some objects are shown below.

  • Page 27: Searching For Large/ Flat Non Ferrous Targets With A High Vdi Angle

    The example below 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. 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.

  • Page 28: Examples Of Some Common Target Vdi

    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. As accurately as possible carry out Ground Balance. 2.

  • Page 29: Warranty Information

    To know more about our products, learn detecting tips, see what setting AKA users use, please refer to: www.aka-detectors.com. You will find a bulletin board where you can ask questions as well as...

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