Minelab GP 3000
Contents
1. Figure 2 6 The GP 3000 battery assembly sTEP4 Ensure thatthe power switch on the control box is switched off and plug the connector on the power cable 19 into the battery connector plug on the control box This cable connects the battery and headphones to the detector Adjust for your own comfort sTEP1 Adjustthe bungy cord 21 from the knuckle 22 on the shaft to correct length to take some of the weight when prospecting step 2 Adjustthe hand strap on the handle 9 for your own comfort COMPLETE ASSEMBLY INSTRUCTIONS Battery The GP 3000 is supplied with a 6V DC rechargable battery pack plus both mains gt m 2 m 0 and vehicle chargers This chapter provides details on battery installation use and performance BATTERY AND CHARGING Go gt j m m 0 When charging the battery must be kept in an upright position Do not leave the mains charger on for extended periods because reduced battery life may result BATTERIES AND CHARGING The Battery The 6V rechargeable battery should provide enough power to operate the detector for 14 15 hrs when fully charged The battery may be recharged at any time during the discharge cycle It is very important to fully charge the battery before storage Do not leave a battery fully discharged for longer than one day Never use a 12V battery because this would damage the detector2. Y Audible Signaal f O No Sound Small Target Large Target Too Low P0532 A Figure 4 6 Threshold control too high CONTROL FUNCTIONS Boost Shallow N Deep Figure 4 3 Enhances the signals produced by different types of targets Shallow enables target signals from small objects close to the Surface of the ground to be amplified This allows for easier detection This setting is best suited for quiet ground N Normal may be used for normal detecting conditions This setting responds to all signals without boosting Deep may be used when searching for large targets at greater depth in noisy ground Random soil signals are smoothed making Small changes In the audio signal from large deep targets easier to hear This may mask some signals from very small targets near the Surface Threshold Figure 4 4 Adjusts the background audio signal or threshold level The Threshold control should be set just above the point where the threshold is just audible and stable This level should not be ata level where prolonged use may be irritating Ideally itshould be a smooth gentle hum Small targets or large deep targets may not produce a distinct target signal but may cause only a small variation in the threshold level If the threshold level is set too high or too low these very small variations may be missed In Figures 4 5 4 7 the dotted line represents the l
3. aig Change Soil switch to Salt setting for salty environments To use the salt setting you will have to use the specially designed GP 3000 range of coils RECOVERING THE TARGET User Info This chapter provides a glossary of terminology user guides technical specifications warranty and repair details and troubleshooting tips TECHNICAL SPECIFICATIONS P0610 A The GP 3000 Length Weight Configuration Transmission Technology Ground Rejection Search Mode Controls Audio Output Coil standard Coil accesory Battery Table 7 1 Technical specifications Maximum 1300mm Minimum 1100mm Complete with 11 coil 24009 exluding battery Shaftmount Bi level Pulse Induction Dual Voltage Technology DVT Automatic ground balance Motion detector Power On Off 2 pos switch Boost Shallow N Deep 3 pos switch Threshold 1 turn control Volume 1 turn control Signal 1 turn control Tone 1 turn control Tune push switch Level Adjust 1 turn control Iron Discriminate All Metal Disc 2 pos switch Soil Sensitive N S alt 3 pos switch Coil Double D M Cancel 3 pos switch Balance F ixed T racking 2 pos switch 6 35mm 1 4 headphone socket Headphones Supplied 11 Double D 18 Double D 18 11 and 8 Mono 6VDC 12Ahr sealed lead acid 14 15hrs Patents Apply Note In the interest of product improvement Minelab reserves the right to m
4. Purchase Date Faulty Part s eee If necessary use the space provided overleaf to continue your description of the fault Owner s Name PO o E fee nh ac sat oe dtd Sch senses ptieste ojnc cet oc PAS sss tans ae hs Phone Day lt lt o ooOoOOOOOOOO HOME eaae a See aes a Fax Email SERVICE REPAIR FORM WARRANTY In the unfortunate circumstance that the detector needs to be returned to Minelab for service please fill out the Minelab Service Repair Form or a photocopy of the same and enclose it with the detector Please supply as much detail about the fault as possible This will assist our service engineers to rectify the problem quickly and efficiently WARRANTY The GP 3000 control box has a 2 year warranty covering parts and labour Refer to your warranty card for details The GP 3000 11 amp 18 Double D coils have a warranty for one year against malfunction Refer to either your supplier or Minelab directly for service The commencement of the warranty Is the date of purchase The Minelab warranty does not cover damage caused by accident misuse neglect modifications or unauthorised service For specific details of the Minelab warranty please refer to the Product Warranty card Itis the responsibility of the owner to pay all transport costs for the detector to Minelab The repaired detector will be returned to the owner freight free This warranty is not t
5. Figures 5 4 5 5 Iron discrimination with the GP 3000 is the silencing or blanking of the threshold which occurs when the detector determines a target is comprised of ferrous metal There is no discrimination when Iron Discrimination is set to All Metal Targets will cause the tone and volume of the threshold to vary These variations convey no consistent information about the type of metal detected Iron discrimination operates when Iron Discriminate is set to Disc Objects must produce sufficiently strong target responses for the detector to successfully discriminate Fortunately mostiron rubbish is located near the surface and should produce the required strong signal response Aoa When Disc is used small or deeper targets whether ferrous or non ferrous will produce a normal target signal Ifa target response Is too weak for the detector to discriminate it will internally change to the all metal mode As soon as the target response becomes strong enough the detector will resume discrimination Pinpointing is best performed using All Metal aie When a target has been located using Disc the coil should be rapidly passed back and forth over the target centre several times Remember to set Ground Balance to Fixed for this The coil should always be passed smoothly over the surface of the ground while maintaining the coil height above the ground This is especially important when attempting to discriminate a target When
6. fe zZ QUICK START INSTRUCTION sTEP1 Setthe Coil switch to Double D sTEP2 Set Soil switch to N Normal sTePp3 Set Balance switch to Fixed sTEP4 Setlron Discriminate switch to All Metals sTeP5 Set Boost to N Normal for general detecting sTEP6 Set Volume to maximum and Signal to 2 o clock sTeP7 Turn Power Switch on steps Adjustthe Threshold control so thata faint sound is heard through the headphones sTEP9 Adjustthe Threshold Tone to suit your hearing sTEP 10 To tune the detector hold at waist height with the shaft horizontal Keep the coil vertical sTEP 11 Slowly move the coil around your body through a half circle until the noise from the interference is loudest fe U m J fe zZ sTEP 12 Hold this position keep the coil motionless and push the Tune switch once to startthe tuning function STEP 13 Tuning takes approximately 60 seconds A series of 3 beeps will indicate thatthe optimum frequency has been selected sTEP 14 For Discrimination change the Iron Discriminate switch to Disc and set Level Adjust to the middle of its range sTEP 15 Setthe Ground Balance by moving the coil up and down While coil is in motion change Balance switch from Fixed to Tracking STEP 16 Once Ground Balalnce has been achieved switch back to Fixed sTEP 17 The detector is now ready for operation QUICK START INSTRUCTIONS EASY REFERENCE DETAILED OPERATING INSTRUCTIONS Turn the GP 3000
7. 3000 may behave erratically or be ineffective in either M Mono or Cancel modes Minelab Monoloop coils can be used on the GP 3000 with excellent results and we recommend their use in conjunction with the coil switch in the M mono mode This allows the use of monoloop coils in soils where prospectors previously had to revert to using Double D coils In extreme mineralization particulary heavy ironstone concentrations you may experience a loud signal spike when attempting to ground balance or while searching The signal is random and very sharp and it is not characteristic of a normal target signal To preventitfrom occuring keep your coil a few centimeters from the ground or optto use the standard GP coilin Double D mode Balance Fixed Tracking Figure 4 21 The GP3000 may be operated with fixed ground balance or automatic ground balance When Balance is set to Fixed the ground balance remains atthe current level When Balance is changed from Fixed to Tracking the detector begins to automatically ground balance through a two sta process thatis described on page 33 To obtain the best performance from your dete how different ground conditions affectthe det Ground Balancing on page 33 for more detai Operation However experienced you are at using a metal detector it is important that you read this chapter to understand how to use the GP 3000 to its full capacity fe U m D
8. 4 1 MINELAB GP 3000 NE e Ohi Shallow OE Deep C2 9 Battery Connector Power Boost Audio Volume Smart Point P0612 B Figure 4 1 Rear Panel Power On Off Figure 4 2 On P0518 A Power Figure 4 2 Power On Off switch Smart Point A quality initiative from Minelab Electronics This switch turns the power from the battery to the detector On and Off Xozi Always switch the detector Off before connecting or disconnecting the coil or battery pack and when not in use The Smart P ointis an intuitive new feature of the GP 3000 Itis primarily a diagnostic test port that ensures that your detector is operating at peak performance before it leaves the factory Smart Pointalso allows Authorized Minelab Service Engineers worldwide to service and test your machine to ensure consistant and maximum performance atall times For service information please contact your local Authorized Dealer Xo Do not attempt to open the Smart Point as doing so may damage your detector and void your warranty CONTROL FUNCTIONS Q fe J e m 0 i Q e J e m 0 Shallow Deep P0519 A Boost Figure 4 3 Boost switch Threshold oo Audio Figure 4 4 Threshold control Target Target D Y Audible Signal k No Sound Too High P0509 A Figure 4 5 Threshold control too low
9. Do not dip the coil into the hole If the signal has decreased in volume or is less defined itis probably ground noise Ifthe signal remains the same or becomes louder itis likely a metallic target If you are still not sure make the hole deeper and repeat the process You may also notice that mineral noises are often experienced from one direction only on the return swing itis no longer there A halo effect which may be built up around a buried metal object makes the object appear to be larger to the detector than it actually is This will be reduced once the target is disturbed from its position in the ground e g a small object detected ata substantial depth may be more difficult to detect once recovered from the ground If the objectis reburied the halo effect will disappear aia Do nottry to eliminate what might appear to be a faint isolated ground noise by balancing the detector because you may be balancing out the targetresponse from a deeply buried metallic target IDENTIFYING TARGET SIGNALS Pinpointing To find an object and reduce the size of the hole required to remove itfrom the ground itis necessary to pinpoint the exact location of the object Ifa targetis heard first confirm it by setting an accurate ground balance and then pinpointing To ground balance change the Balance switch to Tracking and pass the coil around the area of the target making sure that the targetis notdetected keep t
10. On Hold the coil away from the ground and metal objects and switch P ower Take time to read this manual coal thoroughly to obtain the best When the GP 3000 is turned Off important performance from your new information e g tuning frequency and ground balance is GP 3000 detector saved in internal memory If detection recommences in the same location the user should not have to re tune or re ground balance the detector Set the Volume Control Volume should be setso that target signals are clear and easy to hear but loud signals are not uncomfortable to your hearing Setthe Volume by passing the coil across a large target and adjusting volume to a comfortable level Now testa very small target at this level Set the Threshold control Adjust the Threshold control until the threshold is just audible through the headphones Small surface objects as well as large deep objects will produce very small changes in the threshold It is important to set the Threshold control correctly to ensure that these targets are heard Experiment with known targets to assist in setting all controls to suit your hearing fe v m J fe zZ DETAILED OPERATING INSTRUCTIONS i U m J z fe zZ You will need to re ground balance every time you select a new position for either the Soil or Coil switches Set the Tone control e Adjustthe Tone control until the thre
11. This damage is not covered by warranty The GP 3000 power supply is internally regulated and using an external regulated power supply is not necessary and may damage your detector Low Battery Indication lf the battery level drops below the desired power to give full function a series of alarm signal pulses are given athalf second intervals sTEP1 Turn the detector Off before disconnecting the battery sTep2 Disconnectthe battery cable from the detector and connect to the appropriate charger Caution Battery Chargers Two types of battery chargers Mains and 12V Vehicle Charger are supplied The Vehicle Battery Charger is designed for use with vehicles which have a negative earth electrical system Mostcars in Australia manufactured after 1970 should have negative earth electrical system Connecting the charger to a vehicle with a positive earth system will cause the fuse in the cigarette lighter plug to blow and the LED indicator will not light Mains Battery Charger The mains battery charger will charge the battery from local mains AC power outlets sTeP1 Connectthe mains charger to a mains outlet sTep2 Connect charger to battery STEP3 Switch the mains outleton The charger will recharge a completely flat battery in approximately 24 hours Partially discharged batteries will require a shorter period to recharge Allow approximately 1 5 to 2 hours charging for each hour the battery was in us
12. detecting a piece of iron a normal target signal should be heard until the detector determines thatthe objectis ferrous Atthis point the signal will blank The strength of the target response required for discrimination to occur may be altered by using Level Adjust Level Adjust Control Level Adjust gives the user the ability to select the sensitivity and likelihood of a target being discriminated as ferrous when used in the Disc mode This may also affect how the detector responds to ground mineralisation compared to metal targets when used in Disc Mode There is usually some overlap between signals from useful targets and some types of iron rubbish The user may set Level Adjust to select the amountof discrimination between two extremes Fully anti clockwise All targets detected but some iron will give a normal signal as per Figure 5 4 Fully clockwise Little iron detected but some small non ferrous targets potentially mistaken as ferrous Turning the control anti clockwise increases the strength of a signal required for iron discrimination to be activated The Level Adjust also affects the Tracking mode When settully clockwise itis unlikely the detector will balance out genuine targets but some ground noise may still give false signals When set fully anti clockwise the detector will balance out ground noise effectively but some faint weak target signals may be missed after repeated
13. detector in close operator needs to take turns announced by three beeps tuning Do not try to tune two Aozi While the detector is selecting the preferred detectors at one time frequency the coil must be kept motionless and clear of metal objects DETAILED OPERATING INSTRUCTIONS Sometimes itmay not be possible to remove the effects of interference completely by using the Tune control alone Once the detector has been tuned for a particular location itshould not require readjustment unless conditions change or new interference is introduced e g other detectors being used in the same area Ifthe interference persists after tuning consider using the Coil switch set to Cancel position Boost Shallow N Deep Boost selects the type of processing and filtering applied to the detector Signals e N Normal may be used for general detecting conditions This does not boost any signals e Shallow boosts signals from small targets close to the surface This makes faint target signals easier to hear This setting may also boost any ground noise therefore Shallow is well suited for quiet ground conditions Deep may be used when searching for large targets atdepth This smooths the threshold and targetsignals from small targets making Small changes in threshold easier to hear Selection of the more suitable position should be after considering both targetsize depth and ground conditions et When Boost is chang
14. normal target signal Level Adjust Figure 4 19 Level adjust gives the user the ability to select the sensitivity and likelihood of a target being ferrous or non ferrous Italso affects how the detector recognises mineral effects in the ground as Opposed to metal targets when ground balancing eee It is important that you read pages 37 and 38 in Chapter 5 for more information Soil Normal Sensitive Salt Figure 4 20 Optimises the detector for different soil conditions and targets by changing the signal processing N Normal may be used in all areas including areas with highly mineralised soil This position has very good sensitivity to a wide range of nuggetsizes and is the mostversatile of the three positions Sensitive may be used when searching for small nuggets especially in areas with highly mineralised soil The extra Stability allows the coil to be used closer to the ground in areas of excessive ground noise Sensitive may not work well if the ground is salty This setting may also reduce the depth at which large nuggets are likely to be found e Salt may be used in areas containing high salt content be they neutral or heavily mineralised In highly mineralised areas without salt this setting may be less sensitive than Normal or Sensitive to small nuggets Coil Double D M Cancel Double D Figure 4 21 4 Mm Changes the sensitivity and search pattern of the coil to allow the Canc
15. Minelab GP 3000 Minelab Electronics Pty Ltd This document contains proprietary information which is protected by copyright Apart from any use as permitted under the CopyrightAct 1968 no part may be reproduced by any process without written permission from Minelab Electronics Pty Ltd 118 Hayward Avenue Torrensville SA 5031 Australia WARNING This document contains Minelab Electronics Pty Ltd rights technical data or restricted rights data or both Patents and trademarks apply Since there may be a range of options available in this detector type equipment may vary according to the model or items ordered with your detector Certain descriptions and illustrations may differ in this manual from the exact model that you purchased In addition Minelab reserve the right to respond to ongoing technical progress by introducing changes in design equipment and technical features at any time INTRODUCTION riasin aE aE 1 ADOUCHIS MINUA arisna E E ETEEN OEE OAN 2 TOO UCING THE MIMS laD OOD iina aaea Ea 3 ASSEMBLE Virno 5 UADACKING your GP 3000 easy rererente seresa tien uenesnae nnd accom 6 Listof pre assembled sections and parts nsresnasisncmiscv rte cunsds sineeciiesaetatainennnearanins 7 Complete ds SOMO IY ANS MUCHONS atacachicrcstoneeredeait aaran ciesmeena tt araninaa nag 8 BATTER Ye Sakasi ssi a deaths dansk its 13 Baten and Naro nenne aware utyaceadegn vac aia oclug tra cha a ictal ea wcecam ender eea i ana ne
16. N TERMS DETECTOR CARE AND SAFETY The GP 3000 is a high quality electronic instrument It has been designed for professional gold prospecting use and the electronics circuitry is encased in a rugged housing Take care of your detector in the following way Keep the detector clean and dry It is very important to keep all electrical connectors clean and dry The control box is not waterproof even though It has been designed to be water resistant Take care to avoid it becoming wet The coil is water resistant and may be used in rain or wet conditions The coil is not waterproof Do not immerse the coil in water Regularly replace such items as teardrop washers and skidplates to give long life to your detector Do not expose the detector to high temperatures or leave it in the sun for longer than is necessary Shading will help protect it Do not leave the detector in a closed vehicle especially in the sun The coil housing will eventually wear through if you scrub the ground with it while searching Use ofa replaceable skid plate will help to protect your coils To prevent dirt entering between the coil and the skidplate silk tape e g Leukosilk which is available from chemists may be used The use of some other tapes e g insulation tape may resultin some loss of sensitivity The control box and coil should not come into contact with petrol or other oil based liquids If any part of the detector comes into contact with corr
17. Nuts 13 Figure 2 3 Armrest assembly You will need to assemble the GP 3000 from all the various components so we have provided you with detailed assembly instructions Assembling and fitting the armrest Figure 2 3 refer also Figure 2 2 STEP 1 STEP 2 STEP 3 STEP 4 STEP 5 Place the two armrest halves 11 on either side of the upper shaft 8 and ensure that the bolt holes are aligned Slide the two nylon bolts 12 through the bolt holes and screw the nylon wing nuts 13 onto the bolts by a couple of turns Slide the T section on top of the control box 10 into the armrest with the battery plug at the rear Tighten the nylon wing nuts by hand Attach the armrest straps 14 using the press studs on both sides of the arm rest Push the armrest straps 14 through the slots in the neoprene armrest cover 15 and then push the cover over the armrest 11 COMPLETE ASSEMBLY INSTRUCTIONS Bungy Knuckle 22 Handle with Wrist Strap 9 Bungy Cord 21 P0512 A Attaching the handle and bungy cord Figure 2 4 Handle and bungy cord Tear drop Washers 5 Nylon Nut amp Bolt 6 Ala z5 po A SA 11 Double D Coil 1 amp Skid Plate 3 P0513 B Figure 2 5 The coil pivot end of the lower fibreglass shaft Figure 2 4 refer also Figure 2 2 Slide the handle 9 onto the end of the upper shaft 8 and setit to a comfortable position
18. Tighten the two screws in the base of the handle with a small flat tipped screwdriver to hold the handle in position STEP 1 Slide the bungy cord knuckle 22 of the bungy cord onto the upper shaft 8 STEP 2 Assembling the intermediate and upper shaft sections Figure 2 5 refer also Figure 2 2 Slide the intermediate shaft 7 into the end of the upper shaft 8 and snap into place Check that the coil 1 has a skid plate 3 attached Check that the coil pivot end of the lower fibreglass shaft 4 has two teardrop washers 5 installed ALO The washers should always be full thickness and should be replaced regularly as they wear out and allow the coil to become loose STEP 1 STEP 2 STEP 3 Push the lower fibreglass shaft 4 into the mounting brackets on the coil and ensure that the spring clip atthe rear of the fibreglass shaftfaces the rear of the coll STEP 4 Attaching the coil Figure 2 5 sTEP1 Lineup the holes in the coil with the pivot end of the fibreglass shaft 4 sTEP2 Pushthenylon boltthrough the holes and fit the nylon wing nut then tighten by hand ett Do not over tighten the nut as the coil housing may be crushed or damaged COMPLETE ASSEMBLY INSTRUCTIONS HINT If the coil cable is able to move around especially near the coil it will be seen by the detector and Cause random noises which may be confusing CAUTION Use only the 6V battery supplie
19. ains maximum sensitivity to metal targets Cancelling the effects of ground mineralisation is referred to as ground balancing This ensures that target signals from objects such as gold are not confused with interfering ground noise The GP 3000 has automatic ground balancing This continually adjusts to minimise the effects of ground mineralisation when Balance is set to Tracking The GP 3000 may be operated with fixed ground balance or automatic ground balance e When Balance is set to Fixed the ground balance remains at the current level e When Balance is changed from Fixed to Tracking the detector begins to automatically ground balance through a two stage process Operating the GP 3000 in Fixed mode In medium to quiet ground you will achieve better depth by operating your GP 3000 in the Fixed position and switch back to Tracking when ground changes or threshold becomes noisy If the ground is highly mineralized or variable then Tracking is the preferred position While in Tracking mode the detector usually stops ground balancing when a target signal is detected However a weak target response may not be recognised as a target if the coil is repeatedly passed over an object and it may be balanced out For this reason Balance should be changed to Fixed when pinpointing a target GROUND BALANCING le U m J fe zZ U m J fe zZ 20 100mm a P0506 A Figur
20. ake changes without notice TECHNICAL SPECIFICATIONS TROUBLESHOOTING Use the following table to check for suggested solutions to problems Table 7 2 Troubleshooting FAULT SUGGESTION No sound Turn Threshold control fully clockwise Turn Volume control clockwise Check power cable and connections Check headphones Check battery Threshold but no target signal Try testing different coils Random noises Check for other detectors interfering R etune using Tuning button Charge the battery Set Coil switch to Cancel Ground balance again Check for thunderstorm build up Battery will not charge using vehicle Check for power to cigarette lighter socket in vehicle charger Check 10 amp fuse in charger plug Battery not holding charge Try alternative charger Check power cable Very noisy threshold Check for interference and re tune Try detecting in a different location Set Coil switch to Cancel If you need to return your detector to Minelab for service please supply as many details as possible about the fault This will enable our service engineers to rectify the fault quickly and efficiently Return the detector in a cardboard box for protection along with the Service Repair Form supplied in this manual Please supply yourname address and phone number along with purchase date and serial number when sending detector parts for repair TROUBLESHOOTING SERVICE REPAIR FORM
21. ay the target signal is unaltered for a small target but is limited for a bigger target see Figure 4 10 e Ifthe Volume were to be turned down close to minimum it potentially will limit all signals to such a degree that most targets will be lost see figure 4 11 ALONS Threshold should be reset after adjusting the Volume level CONTROL FUNCTIONS i O fe J fe m 0 i 2 je J e Im 0 P0522 A Audio Figure 4 12 Signal control AS Minimum Low P0510 A Figure 4 13 Reduced pitch variance Maximum P0536 A Figure 4 14 Increased pitch variance Tone P0523 A Audio Figure 4 15 Tone control CONTROL FUNCTIONS Signal Pitch Figure 4 12 Adjusts the pitch response of the target signal In Figures 4 13 and 4 14 the curving line represents the high low pitch response to a target The dotted line represents the threshold tone Atminimum position the high low pitch variance to a targetis reduced e Atmaximum position the high low pitch variance to a targetis increased Tone Figure 4 15 Adjusts the tone of the threshold The user may set this to the preferred tone e g the tone at which the operator s hearing is most sensitive Atminimum position threshold is set ata low tone Turning clockwise increases the tone to higher pitch Front Panel Figure 4 16 NE GP 3000 MINELAB e Al
22. d COMPLETE ASSEMBLY INSTRUCTIONS Attaching the lower fibreglass shaft Figure 2 2 STEP1 Slide the lower fibreglass shaft 4 into the intermediate shaft 7 sTep2 Adjustshaftlength and coil angle for a comfortable position Minelab recommends thatthe shaftlength be setto givea comfortable sweep length of approximately 2 meters The lower fibreglass shaft can be setinto position by locating the spring clip into the holes provided in the intermediate shaft and hand tightening the locking nut atthe end of the intermediate shaft Securing and connecting the coil cable easy Always ensure that the control box is turned off before connecting or disconnecting the coil sTeP1 Wind the coil cable around the shaftand plug the coil connector into the coil Socket on the control box Check that the cable is wound firmly around the shaft without strain leave enough Slack atthe bottom of the cable near the coil to allow for adjusting the angle of the coil without placing strain on the coll cable sTep2 Fasten the cable into position using the Velcro straps provided 20 Fitting and connecting the battery pack Figure 2 6 sTEP1 Fitthe battery 17 into the backpack pouch 18 sTep2 Connectthe headphones 16 and the power cable 19 to the appropriate sockets in the cap of the battery sTep3 Puton the backpack 18 1 ss Power Cable to Detector 19 6 Volt Battery 17 Battery Pouch 18 P0503 A
23. d worked out areas and find the gold others have missed Minelab wished to thank you for purchasing our most advanced gold detector ever and are confident the GP 3000 will lead you to success in your quest for gold and treasure INTRODUCING THE MINELAB GP 3000 Contact Minelab Minelab is always interested in your opinions so if you have any questions or comments regarding the GP 3000 or any other Minelab product please feel free to contact us via your local Authorized Minelab dealer or write to us Minelab Electronics Pty Ltd Minelab USA Minelab International Limited PO Box 537 2700 E Patrick Lane Laragh Torrensville Plaza Suite 11 Las Vegas Bandon South Australia 5031 Nevada 89120 Co Cork AUSTRALIA UNITED STATES OF AMERICA IRELAND email ho minelab com au email minelab minelabusa com email minelab minelab ie tel 61 8 8238 0888 tel 1 702 891 8809 tel 353 23 52101 Visitour site on the World Wide Web http www minelab com for the latest information i on Minelab products and services Assembly This chapter provides details and instructions on assembling and adjusting the GP 3000 UNPACKING YOUR GP 3000 P0616 A The GP 3000 as shipped Figure 2 1 Contents of the GP 3000 pack A Mains Charger Control Box B Headphones J 11 Coil C Power Lead K ShaftAssembly D Arm Rest Optional Extras E Handle Assembly Hard Carry Case F Instruction Man
24. e The flashing rate of the charger LED will increase as the battery charges Go Vehicle Battery Charger The vehicle battery charger will charge the battery from the cigarette lighter socket of most motor vehicles gt j m 2 m 0 sTEP1 Connectthe charger to the cigarette lighter socket and turn the ignition switch to Accessories This supplies 12V power to the cigarette lighter socket This voltage is converted by the charger to charge the detector battery A red LED indicator will flash while the battery is charging When the battery is flat the LED may flash fast enough so as to appear constantly on As the battery charges the LED will flash ata slower rate STEP 2 Leave the battery to charge for approx 10 hours using this charger lf the battery voltage of your vehicle drops below 11V the charger will stop operating Therefore the battery charger should not flatten the vehicle battery Check that your vehicle battery is in good condition before camping in remote areas Run your engine above idle speed for atleast 30 minutes each day to keep your vehicle battery charged BATTERIES AND CHARGING Controls It is important to familiarise yourself with the features of the GP 3000 control panel A few minutes spent reading this chapter will be a worthwhile preliminary to detecting a a 2 fe J fe p i e e Z po e p DETECTOR SOUND Threshold a
25. e 5 2 Setting the ground balance GROUND BALANCING Ground Balancing Procedure Figure 5 2 Move the coil up and down between 20mm and 100mm above the ground and while moving the coil change Balance from Fixed to Tracking e The fast ground balance lasts only 5 sec after switching to Tracking Therefore itis important to be moving the coil as the Switch is changed e Keep moving the coil until all ground noise has stopped A persistent signal may indicate a targetin the ground fthis occurs then move the coil to a new location and repeat the procedure e When there is no longer a change in the threshold while the coil is being raised and lowered the detector is ground balanced e When the detector has been ground balanced the user may select either Fixed or Tracking for detecting See previous page lf the ground is highly mineralised or variable use Tracking Ifthe ground mineralisation is very mild to medium use Fixed and Switch back to Tracking periodically to re ground balance Do nottesta target by switching to Tracking when the coil is above it aiitm it may useful to repeat the ground balance procedure if ground conditions change rapidly IRON DISCRIMINATION Discrimination is the ability of a detector to distinguish between different types of metal objects and to assist the user in identifying a target Some goldfields are littered with rubbish e g metal objects which are of l
26. ed Threshold may also need to be adjusted i U m J fe Zz External amplifiers may be used in addition to the Boost switch provided that they have loudness limiters builtin This prevents loud Signals becoming unpleasant or dangerous to the user s hearing DETAILED OPERATING INSTRUCTIONS GROUND BALANCING e Where possible always search in Fixed position for best depth Use Tracking in areas with excessive ground noise e When searching in Fixed position remember to re balance periodically by changing into Tracking then return to Fixed to continue searching e Always Pinpoint a potential target in Fixed If mineralization is excessive you may need to lift the coil off the ground by acm or 2 Rather than keeping it right on the ground this will help to reduce the effects of high ground mineralization and let you hear more targets much easier The Level Adjust control also effects the Tracking mode by altering the detectors perception of what is ground noise and what is a weak target see pages 37 and 38 The ground contains not only sand but also many different chemicals minerals and salts These extra materials are referred to as ground mineralisation This ground mineralization may often produce a sound from the detector Known as ground noise The GP 3000 has the ability to cancel out the effects of ground mineralisation This minimises ground noise and ret
27. ed can cause instability or chattering of the detectors threshold The types of interference commonly occur due to power lines underground cables radar other detectors or climatic conditions like thunderstorms Mostground contains certain minerals which can cause false signals to be given by a detector Heavily mineralized ground requires different ground processing than does neutral or lightly mineralized ground see Ground Balance Ground containing heavy salt concentrations require entirely different processing again Sea Salt Monoloop coils are the style of coil where the multiple strands of wire are wound in a Single loop around the circumference of the coll The field of search of Monoloop coils tend to be cone shaped Metals not containing significant levels of iron Non ferrous metals are non magnetic such as Gold Silver Copper Brass Lead or Aluminium The method of locating the precise location of a target prior to digging Pinpointing uses the design of the search coil windings to determine the exact position of the detected target RX refers to the response or electromagnetic field which is received back by the coil and is used by the control box circuitry to detecta metal item in the ground Salt Search Coil Search Pattern Threshold Target Response Target Signal Tracking The presence of high salt content in the ground being searched will have a similar but different effect on the metal detec
28. el mosce g GP 3000 range of Double D coils to become multi versatile coils with il different characteristics to suit different environments This is achieved by Coi altering the pattern of transmit TX and receive RX fields of the coil O fe J e 0 Figure 4 21 Coil switch and how the control box interprets the response Double D can be used in most areas of medium to very high mineralisation being the mostable to cope with ground noise Itis also excellentfor pinpointing targets as the response is strongest from the centre of the coil M Mono may be used in mostlocations of low to medium mineralisation and for locating small nuggets with Soil switch set to Sensitive P inpointing is not centred in the middle of the coil but to one side and may give a complex signal when the target is very close to the coll e Cancel may be used in areas with very high electrical interference where the Tune function has difficulty selecting a quiet operational frequency e g near power lines electric fences or under poor atmospheric conditions CONTROL FUNCTIONS i Q e Z J e 0 Fixed Tracki Ng P0529 A Balance Figure 4 22 Balance Fixed Tracking Switch Pinpoint in Cancel will again be to one side of centre and signals may be complex if target is close to the coil This setting will limit sensitivity to deep targets Needs Coils not specifically designed for the GP
29. evel at which the audio output becomes audible signals cannotbe heard if they are below the dotted line Ifthe threshold level is settoo high then small variations in audio signal might not be discernible above the threshold level Figure 4 5 An example of this would be to hear a whisper within a crowded noisy room Small Large Target Target O Audible Signal xe lt ia N J No Sound Just Right P0533 A y Volume P0521 A Audio Figure 4 8 Volume control E Maximum P0508 A Figure 4 9 Maximum volume 8 _ G Mid range P0534 A Figure 4 10 Mid range volume g 9S Minimum P05035 A Figure 4 11 Minimum volume If the threshold level is set too low there is no audible background Signal and small target signals will not go above the threshold of audibility Figure 4 6 ANAE A Soft audible headphone signal which is comfortable to listen to for extended periods is recommended Figure 4 7 Volume Figure 4 8 Sets a maximum limiton the loudness of the target signal obtained from a large target Refer to Figures 4 9 4 11 The dotted line in these figures represents the level of volume set by the volume control e ifthe Volume is setto maximum fully clockwise the target signal is unaltered and proportional to the target size and depth see Figure 4 9 ifthe Volume control is turned down to half w
30. ground with the coil horizontal STEP 11 Take a handful of the diggings and pass over the coll Your hands and wrists must be free of any metallic jewellery and watches sTEP 12 If there is no signal place the handful carefully in a new pile and repeat with another handful Neues Always refill any holes before leaving and scatter leaves etc to restore the area to its original condition Any rubbish you recover should be taken away with you and disposed of properly Recovering Deep Targets The GP 3000 has depth capabilities that will surprise both new and experienced prospectors If the target appears to be buried deeply it should help to use the following technique sTEP1 Use the cross sweeping method to locate the target accurately sTEP2 Diga hole large enough to inserttne coil approx 100mm deep STEP3 Keep testing the target location as you dig deeper sTeP4 Take care that the targetis notin the wall of the hole You may dig pastit Try pinpointing again to check your hole is in the correct position aiana Removing rubbish and refilling holes will help metal detector users maintain a good reputation This should lead to more areas being readily accessible for prospecting Salty Environments The GP 3000 will find objects at great depths in salty environments However the interfering signals caused by highly concentrated salt may notbe able to be completely balanced out if using automatic ground balance alone
31. he coil away from where the targetis While the coil is moving around the area of the target change Balance to Fixed This will give a very accurate ground balance on this area One of the pinpointing techniques may then be used When a targetis detected sweep the general area with the coil taking note of where the strongest signal is received By shortening the length of the sweep it should be possible to draw an imaginary line in the ground where the strongest signal is located Line up the target at 90 from the initial direction and repeat the process The objectis located where the two imaginary lines cross see Figure 6 4 TARGET COULD BE SWEEP ANYWHERE IN THIS DIRECTION gt AREA EXACT LOCATION OF TARGET a S IMAGINARY LINE OF STRONGEST SIGNAL SWEEP COIL AT 90 DEG P0173 A TO PREVIOUS SWEEP Figure 6 4 Pinpointing technique Newt Pinpointing will not locate a target in the centre of the coil if operating with the Coil switch set to M Mono or Cancel IDENTIFYING TARGET SIGNALS RECOVERING THE TARGET When you are sure of the location of the target it is necessary to dig a small hole to recover it In order to preserve the environment the hole should be as small as possible Always replace the soil and grass which is removed Itis essential to carry atleast one of the following digging tools with you when searching e small strong digging spade e pick e sh
32. ints and techniques for better detecting and happy prospecting that will help you to utilise the power of your GP 3000 3000 with DVT DETECTING TECHNIQUES Check your footwear Some user tips The battery should be worn in the backpack supplied This places the battery atthe furthest practical distance from the coll e Ensure that you do notsetthe shaft length too short e Ifthe coil is too close to your body it might detect your pick the battery or any other metal which you are carrying If false signals are occurring as you sweep the coil check that they are not produced by any metal that you are carrying Note When detecting do not wear steel cap boots or shoes with metal eyelets Move the coil closer and then further away from your body in order to check ifthe signals are coming from items such as your pick or battery If they are you must increase the distance between the coil and these items Motion detection The GP 3000 is a motion detector Therefore the detector must be moving over a target to detect it CORRECT l Parallel Sweeping Procedure J Figure 6 1 7 M e The coilshould be sweptover the ground in a side to side ee Sweeping motion e While sweeping the coil itis important to keep it parallel to and at INCORRECT g the same height from the ground atall times Lightly skidding the coil across the ground can sometimes help in this depending
33. its signals Operating in Mono the coil has some of the characteristics of a Monoloop coil Use of Mono will often increase the sensitivity of the detector but may also be a little more unstable in heavily mineralised ground Pinpointing will be off to the left of centre Cancel changes the electromagnetic field of the coil so that it is particularly stable in areas of electrical interference This position is ideal in areas where the operator wants to detect close to suburbia or under power lines etc Set the Tune control Figure 5 1 Tuning should be done initially with the Coil switch in Double D or in M Mono If the interference is still severe after completing the tuning operation change the Coil switch to Cancel and then re tune the detector again 60 e Hold the detector at waist height and the coil vertical beep beep beep e Keeping the coil vertical slowly move it through a half circle around Bi your body Figure 5 1 The tuning process e Listen for an increase in interference as you move the coil When the interference is loudest stop moving the detector hold it motionless in that position and momentarily press the Tune switch U m D fe zZ The detector will then scan through the available range of transmission frequencies and automatically selectthe frequency that results in the greatestreduction of noise from electromagnetic l l interference When tuning
34. ittle value and are an annoyance to detector users The GP 3000 is capable of rejecting many iron objects while still detecting non ferrous metals The ability of the detector to discriminate ferrous targets means that while detecting in littered goldfields much of the iron rubbish may be ignored with a high probability that valuable targets will not be missed Double D Coil Ground Surface q gt Audio Blanking Normal Audio Normal Audio Ferrous Non Ferrous Disc mode Ferrous Target signal blanks as coil passes over target Target Signal Nee Non Ferrous Signal is more steady as coil passes over target NOTE The above zoning is only a stylistic example of how the Discrimination mode works The above areas are not determined by depth but by the strength of signal P0507 A P0507 A Figure 5 3 Discrimination levels IRON DISCRIMINATION 5 fe U m J fe zZ AN Normal Signal P0514 A Louder Figure 5 4 A normal signal on a non ferrous target Disc Ferrous Response Blanking Louder P0514 B Figure 5 5 Discrimination target signal on a ferrous target fe U m J z z Discrimination will give the best results when used in combination with the specially designed GP 3000 coils Discrimination will not work correctly when using mono coils IRON DISCRIMINATION lron Discriminate
35. l Metal Sensitive Double D Fixed Level Adjust Disc Salt Cancel Tracking Iron Discriminate Soil Coil Balance Coil Connector 4 P0613 B z Figure 4 16 Rear Panel O m dp Tune Tune Figure 4 17 Reduces the effects of electromagnetic interference from sources such gt o524 aS power lines radio transmitters and other metal detectors Figure 4 17 Tune control Automatic tuning is started by pressing and releasing the Tune switch The tuning process takes approx 60 sec and completion is indicated by three sharp beeps CONTROL FUNCTIONS i Q e Z po e m 0 All Metal Disc P0525 A Iiron Discriminate Figure 4 18 All Metal Disc switch Level Adjust pos2s a Iron Discriminate Figure 4 19 Level Adjust control Sensitive Salt P0527 A Soil Figure 4 20 Soil Normal Sensitive S alt Switch CONTROL FUNCTIONS lron Discriminate All Metal Disc Figure 4 18 Selects between discrimination or to turn off the discrimination altogether All Metal In All Metals the detector will give varying volume and pitch signals but this information does not indicate the type of metal in the object In Disc a strong response from a ferrous iron object will cause the threshold to be blanked or silenced Aloiz If the target response is too weak for accurate discrimination the detector will give a
36. ls on battery terminology user guides technical installation use and performance Specifications warranty and repair details and troubleshooting tips i 4 CONTROLS This chapter is designed to familiarize you with the various features of the GP3000 control panel A few minutes Spentreading this chapter will be a worthwhile preliminary to basic or advanced detecting ABOUT THIS MANUAL INTRODUCING THE MINELAB GP 3000 P0610 A The Minelab GP 3000 utilises Dual Voltage Technology DVT which is based upon the Bi polar technology used in our military range Here are some features of the GP 3000 e NEW Low Noise circuitry NEW battery harness NEW SmartPoint diagnostic port e DVT technology for optimum depth and sensitivity in all soil types e Long life 12Ahr Gel Cell battery Selectable TX transmit modes Soil Switch for optimum performance in different soil conditions e Selectable RX receive modes Coil Switch for greater sensitivity and less susceptibility to interference e Heavy Duty Bungy Strap Like its predecessor the GP extreme the GP 3000 can handle heavily mineralized and salty ground conditions with greater ease than previous detectors which effectively opens up NEW detecting areas The new Low Noise circuitry found in the GP 3000 results in a Smoother threshold enhancing your ability to hear faint signals caused by small and deep targets This allows you to revisit ol
37. nd Tone This is the background sound produced by the detector The level is set using the Threshold control The tone of the threshold is set using the Tone control Target Signal This is the abrupt change of the tone and volume of the threshold sound when a target is detected e The maximum level is set by the Volume control e The amount of tone variation is set by the Signal control e ifthe tone falls first and then rises as the coil is passed over a target this generally indicates a small target e ifthe tone rises first and then falls as the coil is passed over a target this generally indicates a large target Ground Noise Irregular noises that are difficult or impossible to pinpoint when moving the coil over the ground Ground noise is caused by the changing chemistry or mineralization of the ground When the Balance switch is set to Tracking these effects are greatly reduced Tune Indication An Initial beep sounds then while the detector is testing the range of frequencies for the moststable the threshold may become more quietor chattery Once selection is complete three sharp beeps are given Low Battery Indication lf the battery level drops below the desired power to give full function a series of alarm signal pulses are given at half second intervals DETECTOR SOUNDS CONTROL FUNCTIONS There are two control panels the rear panel and the front panel Rear Panel Figure
38. neetne 14 CONTROL Saisara aai 17 Detector sounds easy reference s ss ssssssssisisrrrrnssnnsinrnnsnnnnnnnnrnnnnnnnnnnnnnnnnnnnnnnnrnnnnnnnnnnnnnnsnnnnnsrtnnnnnnana 18 COHUO TUNETONS Fear DANE larna A A 19 CONTOUNCION S TOME DAE hennon a O Maman tno nana 23 OPERATION epee reer rere ene Fr rr SP ee er eee er er eee Pee eee ee ern 27 MICK STAI INSTUCTIONS EGS VTEIGMENCE eionesserot onr ae sea hiaeen tations 28 DECC operating INS UUCHONS creenin E E nna tannen teas A orice macnn 29 Ground Da ro glellits Seasann N E A tere cer rare rt er etre 33 cola colisferdiay laichilol spereemmepertmercemeet eer te E me incr mpc a Vitara h tier err eerermrcten Peon Meerrr se 35 EVEL ACIU ST COMM lioiii save becivss ect cucas ted sucstasesed EEE O A ATE 37 TABLE OF CONTENTS DETECTING TECHNIQUES iccsciccscsucsnsecicetieniessussusensenteasvatcvutvevsvisuacvacnnesieamustecsstevnetnumntienneee 39 DEEN ECIM 2 crse ned teeter ye o anin cee aise a eee etl 40 Prospecting techniques css sncasnnssexaatvetsenancatuetsasonoensatnntanpitaunssiediassatesniestasimrntestedlsmnetiastatiantenctaraial 42 identifying target signalo enrian E r 43 Recovering the target s s ssssssresnssnsnnrnnntannnnannnnnnnnnSnAAASEAAASENAASAAASENEASEAENEENESENEESEEEENEEEEREEEEEEEE PESEE PERKER EESE 45 USER INFORMATION csssssessesesssssesessecsecseseeseesessesaeseeseraeeasseeseesessenaesaeseeseesesetansaees 49 Technical specifications for the Minelab GP 3000 s
39. on mineraliz ation Do notraise the coil atthe ends of each sweep as this will reduce PO265 A the detection depth and may cause false signals Figure 6 1 Parallel Sweeping DETECTING TECHNIQUES Covering the search area Figure 6 2 and Figure 6 3 e As the user moves forward slowly the search pattern should resemble a snaking path e To ensure that the ground is thoroughly searched approach the area from 3 different directions ai Overlap each sweep e Each sweep ofthe coil should overlap the area covered by the previous sweep to ensure a full coverage of the area being searched e Be aware of the search pattern of the coil being used and overlap sweeps to take this pattern into account See also Pinpointing Technique page 44 Figure 6 3 Search area from 3 directions DETECTING TECHNIQUES PROSPECTING TECHNIQUES The GP 3000 has superior ground balancing and it is possible to find quite large objects near the surface in well worked areas where other detectors have been unable to cope with the high degree of mineralization and or salt Therefore the user should dig all target signals even in previously detected areas For Maximum Gold Recovery Keep the coil as close to the ground as possible Listen very carefully this is more important than looking SLOW DOWN Do not rush take your time PROSPECTING TECHNIQUES Very sudden or large change
40. osive substances including salt or salt water itshould be washed with fresh water Clean the detector with a damp cloth using a mild soap detergent Do notuse solvents DETECTOR CARE AND SAFETY AN IMPORTANT MESSAGE FROM MINELAB We ask YOU as a responsible detector operator to take all due care regarding the environment Minelab cannotstress enough the importance of being responsible when recovering targets BACKFILL EVERY HOLE YOU DIG If care and consideration is taken during and after the removal of targets especially with respect to the back filling of holes this Should ensure the continued access to areas for prospecting and treasure hunting This will also ensure that the pristine condition of our beautiful bushland forests and dry land areas is maintained with a minimum of damage Minelab is working with you towards preserving our natural environment so that the benefits of gold prospecting and treasure hunting can continue to be enjoyed in the years to come Every prospector and treasure hunter around the world and the staff of Minelab thank you for your continued efforts towards protecting the environment IMPORTANT MESSAGE FROM MINELAB
41. ovel e crowbar for very deep objects in hard ground sTeP1 Before digging clear the area of loose surface material and check that the target signal is still there If itis not the target should be amongstthe surface material sTep2 Ifthe targetsignalis still present dig to a depth of approx 50mm sTep3 Ifthe target cannot be seen sweep the coil over the hole sTep4 Ifthe targetsignal is not heard then the target should be in the pile just dug steps Check thatthere are no objects buried in the soil under the pile sTep6 Take care when you dig as damaging a nugget may reduce its value Start digging approx 100mm in front of the target to reduce the chance of damage sTep7 Pile the diggings carefully as it may be necessary to search them steps Ifthe targetis located in the soil which was removed sweep the coil over the pile and pinpointits exact position RECOVERING THE TARGET HINT step9 Keep halving the pile which has the target When the object has been recovered it may be worthwhile sweeping the hole again to ensure that there are no other targets If you find an object ina particular location search the surrounding area very carefully It is likely that there are more objects nearby If you hear a target signal keep searching until you find the object it is there and may be valuable RECOVERING THE TARGET sTEP 10 If itis still difficult to find the target place the detector on the
42. ransferable or valid unless the enclosed warranty registration card is returned to Minelab Electronics Pty Ltd or an authorised Minelab Electronics Pty Ltd regional distributor within 14 days of the original purchase ACCESSORIES Search coils ACCESSORIES The GP 3000 is supplied with the 11 Double D coil This coil has been specially designed to take advantage of the new technology and features of this detector In addition to this there are also a number of other size coils now available to give improved performance to your detector These range from smaller coils which give greater sensitivity to small targets and are lighter and manouverable in heavy vegetation up to larger coils which give greater depth See your Minelab retailer for the full range In some circumstances other Double D and Monoloop coils will work on the GP 3000 however there are limitations which will mean thata number of the new benefits of the DVT technology will not work properly In some cases the use of coils not designed for the GP 3000 will cause the detector to be unstable and noisy Batteries Spare 12Ahr batteries can be an advantage especially if travelling into the outback Having a Spare battery that you can use after lunch can ensure that you re always detecting at full power A smaller light weight battery is also available from Minelab This is rated at 4 5Ahr and gives approx 3 4 hours running time per charge The
43. s in the mineralization of an area may produce a signal from the detector In some goldfields a response may be received from a concentration of orange reddish dyke material or clay If detecting areas of extremely variable mineralization detecting with the contours rather than across the changes will often stabilize the effect In some ground particularly heavily mineralized areas the operator may need to sweep the coil 1 or 2 cm above the ground This should give a more stable threshold and less ground noise Charcoal may sometimes produce signals similar to a metallic object when close to the surface Charcoal is usually created by farmers burning off tree stumps or by bushfires When the charcoal under the surface is disturbed the signal will vanish Ifin doubt scrape away some soil above the suspect signal if the signal gets stronger itis likely to be a target Dig it IDENTIFYING TARGET SIGNALS Metallic targets will usually give a solid sounding signal when the coil is swept across the object from any direction Ground noises usually give a broad uneven signal when the coil is swept from different directions A metallic target generally produces a short sharp and mostly symmetrical signal If you are not sure if the sound is ground noise or a target signal you need to investigate Scrape a Shallow hole about 70 100mm deep over the suspected target Sweep the coil over the hole at the original ground level
44. shold is ata comfortable tone for your hearing Interpretation of the target signals involves understanding the difference between the rising and falling tone and volume of the threshold in response to different targets aia Setting Tone to a high pitch may be more fatiguing but is more Suitable for identifying the faintest target signals Set the Signal control The human hearing is sensitive to changes in tone so the operator is more likely to hear a target signal when both the volume and the tone change rather than volume alone The Signal control gives the operator the ability to choose between a target signal thathas a large variance of tone or one which has less variation High variance can give the operator more signal definition to interpret however in highly mineralised ground this high variance of signal may cause confusion and a lower setting is preferred Soil switch Use this switch to optimise the detector s ability to detect in different ground conditions see page 24 for full description Coil switch Selection of different positions of this switch changes the electromagnetic field of the coil thus giving better performance in certain environments See page 25 for more information Double D has the coil operate in a conventional Double D search pattern with all the same advantages and disadvantages DETAILED OPERATING INSTRUCTIONS M Mono changes the way the coil transmits and receives
45. sssssssssssssrnsrnsrnnrnsrnnrnnnnnnnnrnnrnnnnnrnnrnnrnnrnnrnnrnnrenrnns 50 TEOD POOU aa E A E ret cere eee 5l A O era EAE EE AE EE OE 52 MW QUINCY a AN EEE E E E E T ENO E 53 PCG SG SONOS E EA E E A cede A A E maeseucsesea se seme seaneaste testa 54 Glossar oT Common TEMS sc scr secre craps nar nm icp ini NaRa aE IER 55 BETEUEL a a T E E E cee errr TAR 59 An important message from Minelab sensuneaneianmsuumaeenuanneaanen ean ensmuneMe Na 60 Introduction The GP 3000 incorporates new technological advances and control functions which have resulted in a detector that combines stable and effective ground balancing with depth and sensitivity ABOUT THIS MANUAL This manual is designed to introduce the detector s features It gives you step by step directions for everything from assembling and adjusting your detector to basic and advanced detector use 1 INTRODUCTION 95 DETECTOR OPERATION Basic overview of the GP 3000 and However experienced you are at this User s Manual using a metal detector itis important that you read this 2 ASSEMBLY This chapter provides details and 6 DETECTOR TECHNIQUES instructions on assembling and Once you are comfortable with the adjusting the GP 3000 a basic detector use there are a few techniques you should be aware of 3 BATTERY The GP 3000 is powered by a 7 USER INFORMATION rechargeable battery pack This This chapter provides a glossary of chapter provides detai
46. sweeps of the coll age Itis usually best to dig outall targets and only use the discrimination function in areas where a large amount of rubbish makes the digging of everything impractical Neg Discrimination functions will only work with strong positive target responses Weak responses will give normal all metal type signals IRON DISCRIMINATION fe U m J fe zZ 0 U m J fe zZ Level Adjust a f Level Adjust MIN FULLY ANTI CLOCKWISE Mostiron objects are discriminated buta few small iron objects will be accepted as non ferrous Dig more junk but less likely to cancel a gold nugget ID function requires stronger signals to operate Suggested for areas with small amounts of junk Only fairly strong target signals will trigger discrimination action Ground track is more likely to balance out targets Medium to strong signal required to pause the Tracking mode MAX FULLY CLOCKWISE Almostall iron objects are discriminated buta few small non ferrous items will also be ignored Dig less junk but may mistake a nugget for ferrous junk ID function requires less strong signals to operate Suggested for areas with a lot of ferrous junk Strong and medium target signals will trigger discrimination action Ground track is less likely to balance out some weak signals IRON DISCRIMINATION Detecting Techniques H
47. target signals but are caused by other factors Common causes for false signals are incorrect ground balance hot rocks signals caused by Knocking the coil on obstacles etc With experience the operator will learn methods to minimise false signals and to hear subtle differences between target Signals and false signals Ferrous Metals Metals composed of or containing Iron A ferrous item is one which is attracted to a magnet and is predominantly or completely made of iron or Steel Ground Balance The ability of the metal detector to compensate for the effects of ground mineralisation The GP 3000 has automatic ground balance When itis used in Tracking mode It continually compensates for changes in the ground mineralization GLOSSARY OF COMMON TERMS Halo Effect Hot Rocks Interference Mineralised Ground Monoloop Coils Non Ferrous Metals Pinpoint RX GLOSSARY OF COMMON TERMS After a metal objecthas remained undisturbed in the soil fora considerable amount of time a diffusion occurs around the object This has the effect of the object appearing to the detector to be a larger size A hot rock is an individual rock which has a particularly high degree of mineralization as compared to the average ground around it Due to this high difference the detector does not have the opportunity to ground balance on the individual rock so therefore gives a false signal Electricity or radio waves in the area being detect
48. tor ground balance as does mineralization Salt content causes a negative response rather than the positive response of laterite soils The detector needs to therefore use different filtering techniques to overcome this effect The search coil is the circular plate which is sweptacross the ground Surface during detecting It transmits electromagnetic signals into the ground and receives the response The search pattern is the area of ground underneath the coil which is being scanned Depending on the style of coil Double D or Monoloop and the Coil mode being operated in Double D Mono Cancel different coils will have a different shaped area being covered by each Sweep The continuous audible level of sound emitted by the detector is referred to as the Threshold This threshold hum is the background sound made as the detector operates Threshold can be set anywhere between silent and loud buta soft audible level is normally suggested The electro magnetic effect generated by the metal target under the influence of the TX field The audio signal or change in threshold caused by the presence of a metal targetas the coil passes across it The function of Automatic Ground Balance where the GP 3000 makes continuous adjustments to the ground balance to compensate for changes in the mineralization of the ground TX refers to the transmit signals or electromagnetic pulses sent into the ground by the coil GLOSSARY OF COMMO
49. ual 18 Double D coil with skidplate in separate carton G 12V Charger H Battery and Backpack UNPACKING YOUR GP 3000 ASSEMBLY AND LIST OF PARTS Arm Strap 14 Armrest Cover 15 Battery 17 amp Battery Pack 18 ry 18 Upper Shaft 8 we Bungy Cord 21 Bungy Knuckle a OK A Qr AU az IR Ia Battery Power Cable 19 SEN 5 A Coil Cable 2 fA EX Control Box 10 Velcro Cable SE Straps 20 gz Handle with P Wrist Strap 9 Tear drop Washers 5 DZA Nylon Nut amp Bolt 6 Ee Intermediate Shaft 7 a Fibreglass Nylon Bolts 12 WA Lower Shaft 4 Armrest Parts 11 J Nylon Nuts 13 11 Double D Coil 1 amp Skid Plate 3 P0614 A A Lower Shaft Assembly C Upper Shaft Assembly D Headphones 1 11 Double D Coil 8 Upper Shaft 16 Headphones 2 Coil Cable 9 Handle with Wrist Strap E Battery and Battery Pack 3 Skid Plate 10 Control Box 17 Battery 4 Fibreglass Lower Shaft 11 Armrest P arts 2 18 Battery Pack 5 Teardrop Washers 12 Nylon Bolt 2 19 Battery Power Cable 6 Nylon Nut amp Bolt 13 Nylon Nut 2 14 Arm Straps 2 ee B Intermediate Shaft Assembly 20 Velcro Cable Straps 3 7 Intermediate Shaft ea Ee ONE 21 Bungy Cord 22 Bungy Knuckle Figure 2 2 Pre assembled sections and parts list PRE ASSEMBLED SECTIONS COMPLETE ASSEMBLY INSTRUCTIONS T p F Nylon Bolts 12 Armrest Parts 11 Nylon
50. weight of this battery is 9689 Corporate clothing Minelab also has a range of good quality clothing e g caps shirts and jackets available Ask your local dealer for details GLOSSARY OF COMMON TERMS Control Box The control box encloses the electronic circuitry of the detector The control box originates the TX transmit signals sent by the coil and interprets the RX receive Signals detected by the coil All user selectable functions knobs amp switches are located on the frontand rear panels of the control box Discrimination The ability of a metal detector to estimate if a located targetis made from ferrous metal iron or steel or non ferrous metal non magnetic Double D Coils Double D coils are coils that have two windings of wire that overlap in the shape of two D s one reversed The characteristics of a Double D coil are stability especially in heavily mineralised ground good depth and sensitivity and a very thorough search pattern Electromagnetic Field Commonly called the signal from the coil An electromagnetic field is generated within the wire windings of the search coil and this field is pulsed or sent into the ground The presence of a metal targetin the ground will disturb the pattern of this field and this disturbance is registered by the receive system of the detector and indicated to the operator by an audible target signal beep False Signal False signals are signals which sound similar to
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