User manual MINELAB SD2200V2

[. . . ] The Minelab SD2200v2 INSTRUCTION MANUAL MINELAB WARNING THIS DOCUMENT CONTAINS MINELAB ELECTRONICS LIMITED RIGHTS TECHNICAL DATA, OR RESTRICTED RIGHTS DATA, OR BOTH. © Minelab Electronics Pty Limited This work is copyright. Apart from any use as permitted under the Copyright Act 1968, no part may be reproduced by any process without prior written permission from Minelab Electronics Pty Limited 118 Hayward Avenue, Torrensville, SA 5031 Australia. 4901-0042-1. 1 November 2002 Page 2 The Minelab SD2200v2 The Minelab SD2200v2 Instruction Manual Contents Page No. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 List of Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] In this case, move the coil to a new location and repeat the procedure. When there is no longer a change in the threshold while the coil is being raised and lowered, the detector is said to be "ground balanced". Once the detector is ground balanced, you can then decide to detect in either Tracking or Fixed mode. If the ground is very mild, use Fixed mode and switch back to Tracking temporarily if the threshold becomes noisy. Do not test a target by switching to Tracking when the coil is above it. 5. 2. 9 Iron Discrimination Discrimination is the ability of a detector to distinguish between different types of metal targets and to assist the operator in identifying a target. Some goldfields are littered with "junk", that is, metal objects which are of little value and are an annoyance to detector operators. The SD2200v2 is capable of rejecting a number of iron objects while still detecting non-ferrous metals. The ability of the SD2200v2 to discriminate ferrous targets means that while working these goldfields, much of the iron junk can be ignored with little fear of ignoring valuable targets. Instruction Manual Page 7 Iron Discrimination Switch The main means of iron discrimination of the SD2200v2 is the `blanking' (silencing) of the threshold which occurs when the detector determines a target is of ferrous metal (magnetic). This form of iron discrimination operates when the Iron Discrimination switch is in the Disc position and the detector is fitted with the supplied 11" Double `D' wound coil. Targets must produce sufficiently strong signals for the SD2200v2 to successfully discriminate iron objects. Fortunately, most iron junk is located near the surface and much of it can produce the required signal strength. Note: When used in Disc mode, deeper or small targets, whether ferrous or non-ferrous, will produce the normal target audio signal. When the SD2200v2 is operated in the Disc + ID mode, the same audio blanking will operate as it did in Disc for strong signals. However, there is an additional mode of iron discrimination which can operate with weaker signals. In Disc + ID mode, the operator needs to monitor the pitch of the signal as the coil is swept over the buried metal target. Most ferrous targets will produce a changing pitch signal as the coil is moved back and forth across the target. Some ferrous targets, particularly thin nail-like targets, can also produce steady pitches just like non-ferrous targets. Some gold will also produce a variable pitch, particularly specimen gold or gold containing a matrix of quartz and/or ironstone. Therefore, only signals with highly variable pitch can be trusted to indicating ferrous targets in the +ID mode. The +ID target mode of recognition requires a lot of operator experience. It is recommended that the operator investigate most targets detected in the +ID mode and learn to distinguish the signals. [. . . ] Three other coils are available as accessories for use on the SD2200v2 -- the 18", 11", and 8" Monoloop coils. This action can damage other detectors and such damage is not covered by warranty. Monoloop coils tend to give slightly stronger or more sensitive signals than the Double `D' coil. However, Monoloop coils are also a little more `noisy' if the ground is heavily mineralised. [. . . ]