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The GP 3500  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 manoeuverable in heavy vegetation, up to larger coils which give greater depth. See your
Minelab retailer for the full range.

In some circumstances, other brand Double D and Monoloop coils will work on the GP 3500,
however there are limitations which will mean that a 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
3500 will cause the detector to be unstable and noisy.

accessories

page 52

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6 user info

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Item Number: 4901 - 0053
Revision: 1.1

For Consumers within the European Union: 
Do not dispose of this equipment in general 
household waste.

The crossed out wheeled bin indicated 
on this equipment is an indicator that this 
unit should not be disposed of in general 
household waste, but recycled in compliance 
with local government regulations or 
environmental requirements.

Please dispose of this equipment via a 
recycling service or centre, or by returning 
the unit to the respective Minelab or Halcro 
outlet as appropriate for your unit. This will 
enable the equipment to be disposed of in an 
environmentally safe manner.

Working for a Cleaner, 
Greener Future

Disposal of unwanted electronic equipment 
in landfi lled waste may contribute to adverse 
long term environmental effect due to 
the leaching of contaminating and toxic 
substances contained within some electronic 
equipment.

Disclaimer: 

The Minelab metal detector 

discussed in this operating manual has 
been expressly designed and manufactured 
as a quality hobbyist metal detector and is 
recommended for use in coin, treasure and 
general metal detection in non-hazardous 
environments. This metal detector has not 
been designed for use as a mine detector or 
as a live munitions detection tool.

Please note: 

Since there may be a variety 

of options available for this detector, 
equipment may vary according to the Model 
or items ordered with your detector. Certain 
descriptions and illustrations may also 
differ (in this manual) from the exact Model 
that you purchased. In addition, Minelab 
reserves the right to respond to ongoing 
technical progress by introducing changes 
in design, equipment and technical features 
at any time.

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 weight of this battery is 968g.

Corporate clothing

Minelab also has a range of good quality clothing, 
e.g. caps, shirts and jackets available. 

Ask your local dealer for details.

Summary of Contents for GP 3500

Page 1: ...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...

Page 2: ...f 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 trea...

Page 3: ...ence 11 Quick start instructions easy reference 12 Rear control functions rear panel 13 Front control functions front panel 20 table of contents l contents l page iii GP 3500 page iii GP 3500 www mine...

Page 4: ...inelab com introducing the Minelab GP 3500 l 1 introduction l page 1 The Minelab GP 3500 utilises Dual Voltage Technology DVT which assists accurate ground balance and increases sensitivity by overcom...

Page 5: ...ly 8 Upper Shaft 9 Handle with Quick Trak push button 10 Control Box 11 Armrest Parts 2 12 Nylon Bolt 2 13 Nylon Nut 2 14 Arm Straps 2 15 Armrest Cover C Headphones 16 Headphones D Battery and Battery...

Page 6: ...ete assembly instructions continued l 2 assembly l page 5 GP 3500 GP 3500 www minelab com page 5 Assembling the lower and upper shaft sections Refer Figure 2 2 Step 1 Slide the lower shaft 4 with coil...

Page 7: ...nuts by hand Step 2 Loop the Quick Trak button cable from the handle back along the shaft and plug it into the Smart Point connection in the control box 10 See page 33 Step 3 Adjust the shaft length...

Page 8: ...rovide 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...

Page 9: ...ehicles which have a negative earth electrical system Most cars manufactured after 1970 should have negative earth electrical system Connecting the charger to a vehicle with a positive earth system wi...

Page 10: ...til finished sequence Step 12 Tuning takes approximately 60 seconds A series of 3 beeps will indicate that the optimum frequency has been selected Do not move the detector during the tuning process St...

Page 11: ...very soft signals An example of this would be to hear a whisper within a crowded noisy room If the threshold level is set too low there is no audible background signal and small target signals will n...

Page 12: ...ume alone 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 The Signal control...

Page 13: ...t switch provided that they have loudness limiters built in This prevents loud signals becoming unpleasant or dangerous to the user s hearing Figure 4 14 Boost switch rear controls continued l 4 contr...

Page 14: ...try see page 33 Quick Trak reset button for more details 2 It is a diagnostic test port that ensures that your detector is operating at peak performance before it leaves the factory Smart Point also a...

Page 15: ...rol is turned further clockwise the operator it able to influence the recognition of a target being ferrous or non ferrous metal Figure 4 18 All Metal Iron Discriminate switch page 22 l 4 controls and...

Page 16: ...l page 25 GP 3500 Discrimination continued Keeping the control anti clockwise requires a slightly stronger signal before discrimination occurs rotating it clockwise means that discrimination will occ...

Page 17: ...ose to the coil 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 d...

Page 18: ...Fixed to continue detecting once this button is released When the ground is variable in mineral content requiring repeated re balancing use Tracking as the detector continuously tests the ground and...

Page 19: ...or variable search in Tracking mode To search in Tracking mode switch the Fixed Tracking switch on the control box into Tracking position In this position the detector is continuously testing and re...

Page 20: ...utton which allows easy operation of ground balancing The Quick Trak push button has two functions depending on where the balance switch is set on the control box If set to Fixed mode If the Balance s...

Page 21: ...g 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...

Page 22: ...ntrol rapidly to move to the desired end you want you will notice noise caused by the rapid movement through the frequencies This is normal and will not be present when the control is turned slowly Th...

Page 23: ...often only present in one direction In some goldfields a response may be received from a concentration of orange reddish dyke material or clay Remember a metal target will get louder by getting the c...

Page 24: ...m a deeply buried metallic target Better to ground balance around the target without going across it then switch to Fixed and try Pinpointing identifying target signals continued l 5 detecting l page...

Page 25: ...d pass over the coil NOTE Your hands and wrists must be free of any metallic jewellery and watches Step 11 If there is no signal place the handful carefully in a new pile and repeat with another handf...

Page 26: ...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...

Page 27: ...unauthorised service For specific details of the Minelab warranty please refer to the Product Warranty card It is the responsibility of the owner to pay all transport costs for the detector to Minelab...

Page 28: ...ntinually compensates for changes in the ground mineralization glossary of common terms page 48 l 6 user info l page 48 GP 3500 Halo Effect After a metal object has remained undisturbed in the soil fo...

Page 29: ...lses sent into the ground by the coil detector care and safety l 6 user info l page 51 GP 3500 GP 3500 www minelab com page 51 take care The GP 3500 is a high quality electronic instrument It has been...

Page 30: ...e equipment to be disposed of in an environmentally safe manner Working for a Cleaner Greener Future Disposal of unwanted electronic equipment in landfilled waste may contribute to adverse long term e...

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