User manual MINELAB SOVEREIGN GT

[. . . ] MINELAB S O V E R E I G N GT Contact Details: Minelab USA 871 Grier Drive, Suite B1 Las Vegas, Nevada 89119 UNITED STATES OF AMERICA email: minelab@minelabusa. com tel: +1-702-891 8809 Minelab Electronics Pty Ltd PO Box 537 Torrensville Plaza South Australia 5031 AUSTRALIA email: minelab@minelab. com. au tel: +61-8-8238 0888 Minelab International Limited Laragh, Bandon Co. Cork IRELAND email: minelab@minelab. ie tel: +353-23 52101 www. minelab. com MINELAB User Manual © 2005 Minelab Electronics Pty Ltd This document contains proprietary information that is protected by copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without written permission from Minelab Electronics Pty Ltd, 118 Hayward Avenue, Torrensville, SA 5031, Australia. Notice: The words `Sovereign', `Broad Band Spectrum' & `BBS' are all trademarks of Minelab Pty Ltd. [. . . ] mode the detector will null or cancel target signals made from unwanted metals. The degree of discrimination is set by using the Disc and Notch control knobs. When the Disc/All Metal Switch is in Disc position and with Disc and Notch control at minimum, the Sovereign GT will cancel all ferrous metals and signal on all non-ferrous targets. As the Disc control is increased (turned clockwise) some non-ferrous metals will be cancelled and as the control is increased further, more non-ferrous metals will be cancelled. In addition, when in Disc mode, the target signals from non-ferrous objects will vary in tone depending upon their level of conductivity. Effectively, this allows general identification of the type of object detected before recovering it from the ground. For example, a US quarter or Australian $1 coin will produce a high pitch signal, whereas aluminium foil will produce a low pitched signal. Pull-tabs, rings, and other coins will produce various intermediate tones, depending upon the object's conductivity. The higher an object's conductivity, the higher the signal tone will be. Also, provided the Threshold / Silent search switch is in the Threshold position, when the Sovereign GT rejects a ferrous or a non-ferrous object, the background threshold tone will momentarily disappear then return again at a pitch similar to the ignored signal. A ferrous object will cause the returning threshold pitch to be much lower than normal, while a pull-tab that is being ignored will cause it to be higher than normal. If the Sovereign GT produces a high-pitched, rapidly pulsing sound, the detector is being overloaded by a substantially large piece of metal close to the coil. Raise the coil a few inches above the ground and pass it over the area again to check the target. By lifting the coil away from the ground, it enables the Sovereign GT to accurately analyse the object detected. Note: If a target signal seems to have "blanked", but the threshold hasn't changed to a different tone (assuming the threshold switch is selected) it may in fact be a very deep target on the edge of the detection depth. Digging down an inch or two will get the coil closer and will enable it to be identified. p16 7. 5. 1. Iron Mask On/Off A fundamental problem for most conventional detectors is the inability to recognize a valuable target when it is located near a ferrous item. This is a particular problem in areas heavily littered with trash, which is common on old relic sites. The Sovereign GT, using Iron Mask / On is particularly good at making the distinction between a non-ferrous target and iron trash, recognizing the non-ferrous target and providing an audio signal. With Iron Mask / On, the search depth is also a little greater and non-ferrous targets may be located more reliably amongst ferrous trash. However, with Iron Mask /On, the detector may give the occasional "beep" on large ferrous targets and the threshold may not be quite as stable. For this reason, beginners may prefer to detect with Iron Mask / Off. [. . . ] However, it is important to leave an area searched in the same condition you found it. When searching parklands or properties where the grassland or lawn is sensitive to disturbance, always use special tools to enable the recovery of targets without digging large holes. This retains the surface "plug" of grass and soil to be returned undisturbed. All holes that have been dug must be properly refilled. [. . . ]