Minelab GPX-4500 Instruction Manual
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Minelab GPX-4500 Instruction Manual

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  • Page 2: Quick Start

    Quick Start Set the front panel switches to the following positions: On/Off Hold for Search Soil / Ground Coil / Mode Timings Balance Instruction Manual Custom Enhance Fixed Double D Deep Special Tracking Cancel Threshold Push and release the On/Off switch on the rear control panel (pg.
  • Page 3 The World Leader in Metal Sensing Technology © Minelab Electronics Pty Ltd any questions or comments regarding the GPX-4500 or any This document contains proprietary From our origins in 1985, Minelab have specialised in advanced electronic other Minelab product, please feel free to contact us via information which is protected by technologies.
  • Page 4 Alignment (SETA), and the latest in high-tech analogue components combined with advanced digital processing. The GPX-4500 will locate gold in all types of ground, especially highly mineralised ground conditions, with greater efficiency than any previous detector. This manual is designed to help both the beginner and expert prospector get the best performance out of the GPX-4500.

  • Page 5: Table Of Contents

    Contents Quick Start Back Cover LCD Backlight Introducing the GPX-4500 Battery / Viewing the Battery Voltage List of Parts Volume Limit / Setting the Max Volume of all Sounds Assembly Ground Balance Type Function Setting Select Adjusting the Detector for Comfortable Detecting 16...

  • Page 6: Introducing The Gpx-4500

    Ground Balance adjustment. you can increase the Rx Gain. In areas Matching your preferred coil sweep The GPX-4500 offers a total of six Timing options, ����������������� that are more difficult Rx Gain can speed with the corresponding Motion each incorporating the all-new SETA technology.

  • Page 7: List Of Parts

    List of Parts �������������������� �������������� ������������� ���������������� ������������� ����������� ������������������� ������������������� ���������������� ����������� ����������� ����������� ����������� ������������������� ����������� ������� ���������� ����������������� ������� ��������������� ���������������� ���������� ����������������������� ��������������������� ������������������ ������������������ ��������������� ����������������...

  • Page 8: Assembly

    Assembly Attaching the Coil to the Lower Shaft: Attaching the Lower Shaft to the Upper Shaft: 1 Plug the two rubber washers into the holes on 1 Rotate the twistlock of the upper shaft counter- either side of the lower shaft. clockwise to ensure it is loosened.
  • Page 9 Assembly Always ensure that the control box is turned off before connecting or disconnecting the coil Attaching the Armrest Strap to the Armrest: to avoid damage to the detector's electronics. 1 Press both strap studs onto the armrest studs. 2 Push the armrest straps through the slots in the armrest cover and then slide the cover Connecting the Coil Cable: over the armrest.
  • Page 10 2 Connect the headphones and the power cable to the appropriate sockets in the battery. Note: The illustration shows Note: After market Making use of the GPX-4500 Amplifier: the battery orientated for accessory boosters may In previous Minelab detectors if a speaker was used,...
  • Page 11 Assembly Attaching the Bungy Cord: 1 Create a loop in the bungy cord. 2 Undo the plastic wingnut and remove the bolt from the clamp. 3 Push the bolt back through the clamp and loop to secure the bungy cord to the shaft. 4 Fasten the screw with the wingnut.

  • Page 12: Adjusting The Detector For Comfortable Detecting

    However, make Ideally the battery should be placed on your back so detector correctly. sure the GPX-4500 isn't that it counter-balances the weight of the detector. detecting a signal from the You should be able to reach the switches of the Adjusting the Position of the Handle: battery.

  • Page 13: Charging The Battery

    Vehicle Charger Adaptor Lithium Ion (Li-Ion) battery pack and an internal The vehicle charger adaptor will charge the charging circuit. Supplied with the GPX-4500 is battery from the accessories socket (cigarette a mains charger adaptor and a 12V vehicle lighter) of most motor vehicles. The socket must charger adaptor.

  • Page 14: Battery Led Patterns

    First phase of charge The Lithium Ion battery is not compatible with Orange with green blink: Last phase of charge non GPX detectors. The GPX-4500 is supplied with a power lead which has been specifically designed to fit Solid green: Battery is charged GPX detectors only.

  • Page 15: Detecting Basics

    Threshold. Electrical Interference The detector may produce random sounds when the coil is motionless. These will not be target signals, but signals caused from the surrounding environment. The GPX-4500 has a Tune function to overcome electrical (pg. 32) interference.

  • Page 16: Front Control Panel

    Front Control Panel Rear Control Panel Threshold (pg. 34) is the background Coil Connector sound produced by the detector. This Connects the coil to the control box. control increases / decreases the level of the Threshold. Smart Point is a connection point for the Quick-Trak button located on the handle.

  • Page 17: Turning The Detector On

    Turning the Detector On LCD Menu Structure The On / Off switch is located Many of the GPX-4500 Functions Settings on the rear control panel. functions are accessed through the LCD Menu. These are explained in To turn the detector on or off: further detail throughout the rest of this manual.

  • Page 18: Search Mode

    Search Mode Search Soil / Ground Coil / Mode Timings Balance Search The GPX-4500 has three Search Mode switch Soil / Ground Coil / Coil Custom Auto Tune Custom Enhance Fixed Double D Mode positions: General, Deep and Custom. Timings...
  • Page 19 Search Mode (Continued) Selecting Custom Mode Custom Search Mode - Hi Trash When the Search Mode switch is in the Custom This mode has factory presets specifically selected position each of the four Custom Search Modes for detecting in an area containing a lot of rubbish. (pg.

  • Page 20: Tune / Reducing Electrical Interference

    Tune Auto Tune Reducing Electrical Interference The detector may be affected by electrical Note: Tuning should be To Perform an Automatic Tune: interference from powerlines, radio transmitters done initially with the 1 Hold the detector at waist height, with the coil electrical equipment or other detectors operating Coil switch in Double-D vertical, and slowly rotate through a half-circle.

  • Page 21: Threshold / Adjusting The Background Audio Level

    Threshold Adjusting the Background Audio Level Threshold is the constant audible background tone When the Threshold ��������������� or 'hum' produced by the detector. The Threshold is too high a faint signal is your reference point and lets you know what the is masked and only the coil is picking up, whether it may be a target, ground peak of the loud signal...
  • Page 22 Different Soil and Target Types Soil / Timings Enhance Soil / The GPX-4500 Timings define the characteristics Normal (N) Timings of the Transmitter (Tx) and Receiver (Rx). The Soil/ Normal gives you the best performance on a wide Timings switch allows you to choose from a range range of soil conditions, and it will provide the best of different Timings.

  • Page 23: Ground Balance Reducing Ground Noise

    Using the Quick-Trak button is an easy way to do this. Ground The GPX-4500 has the ability to cancel out the Note: Where possible, always search in Fixed GB to Balance Tracking...

  • Page 24: Ground Balance Procedure For Tracking

    Ground Balance Procedure for Tracking (For Ground Balance Type – General) Ground 1 Find a clear area of ground without any targets. Ground Balance reset in Tracking Balance Whilst sweeping the coil you should periodically 2 Change the Ground Balance switch to Fixed. Fixed test that you are still in harmony with the ground by 3 Whilst keeping the coil parallel to the ground, lower...

  • Page 25: Ground Balance Procedure For Fixed

    Ground Balance Procedure for Fixed (For Ground Balance Type – General) 1 Find a clear area of ground without any targets. Note: When searching in Ground Balance reset in Fixed Ground Balance Fixed it is very important Whilst sweeping the coil to test if you are still in 2 Change the Ground Balance switch to Fixed.
  • Page 26 GPX-4500 with excellent also be a little more unstable in heavily mineralised giving better performance in certain situations.

  • Page 27: Resetting Factory Presets

    Resetting Factory Presets On/Off The GPX-4500 is provided with a Factory Hold for Preset selection of menu settings, suitable for first-time users. Until you become more familiar with the GPX-4500 the detector can simply be operated with the Factory Presets and the front panel controls.

  • Page 28: Factory Presets

    Factory Presets Universal Functions Universal Functions Main Menu: Range: Factory Preset: Main Menu: Range: Factory Preset: Backlight Off, 1–8 Special Salt-Coarse Sens Extra Sens Extra Battery Test 0–8.0V – Sharp +8.0V Sens Smooth Volume Limit 1–20 Manual Tune 0–255 GB Type General General Specific...

  • Page 29: Function Select

    Function Select Setting The Function Select control scrolls Once a function has been selected through a list of functions. the Setting control accesses a settings adjustment screen. Title Navigation Arrows Navigation Arrows Indicates what type Indicates which way Indicates which way of function you are the menu can scroll.

  • Page 30: Accessing Functions

    Accessing Functions Accessing Settings Function Setting Function Setting Function Setting Select Select Select On/Off On/Off On/Off Hold for Hold for Hold for Turn the Function Select With a function highlighted control right to scroll down turn the Setting control to the the list.

  • Page 31: Lcd Backlight

    LCD Backlight Battery Viewing the Battery Voltage Range Off, 1–8 Range 0–8.0V Factory Preset +8.0V In low lighting conditions the LCD can be backlit. The Battery Volts screen allows you to view the You can select how long the backlight stays on for current voltage of the battery.

  • Page 32: Volume Limit / Setting The Max Volume Of All Sounds

    Volume Limit Volume Limit Setting the Maximum Volume of all Sounds Range 1–20 Factory Preset Volume Limit is the maximum level of sound emitted Maximum Volume Limit: ������������ by the detector when a target is detected. Faint and loud signals are unaffected.

  • Page 33: Ground Balance Type

    Ground Balance Type (Ground Balance, pg. 38) Range General, Specific, GB Off Factory Preset General General GB (Ground Balance) Off This is the best Ground Balance Type for use in over In very benign soils, such as non-mineralised loam 90% of goldfield soils and uses the conventional or sand, there can be very little and sometimes automatic Tracking as found on the previous Minelab no ground effect.

  • Page 34: Ground Balance Procedure For Specific

    Ground Balance Procedure Special for Specific Soil/Timings Range Salt-Coarse, Sens Extra, Sharp, Sens Smooth Factory Preset Sens Extra When moving to a new area the first Specific You can select which timings will be activated by the Ground Balance must be done with the Ground Special switch on the control panel.

  • Page 35: Special / Soil/Timings

    Special Manual Tune Soil/Timings (Continued) Reducing Electrical Interference (Auto Tune, pg. 33) Range 0–255 Sharp Manual Tune allows you to scroll through and select a particular channel. Sharp is similar to Normal but it puts out a more powerful detection field. It is capable of an Manual Tuning through the full range is time improvement in depth, but it is more susceptible consuming.

  • Page 36: Changing Search Modes

    Changing Search Modes Search Soil / Ground Coil / Coil Mode Timings Balance Search Mode gives the operator access to a Tip: If you wish to quickly compare settings you can Auto Tune Custom Enhance Fixed Double D number of detecting modes to use under different change the search mode switch on the front panel circumstances.

  • Page 37: Motion / Adjusting Sweep Speed

    Range 1–20 The speed at which you sweep the coil has an The Rx Gain function allows the GPX-4500 to be effect on target response time and Ground Balance optimised for differing conditions; controlling the adjustment. Matching your preferred coil sweep...

  • Page 38: Audio Type / Changing The Response Of Target Signals

    Audio Type Audio Tone Changing the Audio Adjusting the Pitch Response of Target Signals of the Threshold Range Quiet, Normal, Deep, Boost Range 1–100 The Audio Type function replaces the Boost switch Audio Tone is the pitch of the Threshold emitted by on the GP series detectors.
  • Page 39 (<3) the threshold will be very stable, but you will lose a lot of sensitivity to smaller targets. This can be a desirable feature in certain scenarios, such as looking for large nuggets in a high-trash area, or using the GPX-4500 to search for coins or treasure.

  • Page 40: Signal Peak / Adjusting Pitch Variation Of Target Signals

    8 it will slightly increase the volume of the threshold as well. This is useful A target signal on the GPX-4500 is normally a two- for very windy conditions, people suffering from tone signal. A target signal which first falls in pitch hearing loss, or when using external speakers.

  • Page 41: Response Inverting The Pitch Of The Target Signal

    Response Inverting the Pitch of the Target Signal Range Normal, Inverted The Response function allows you to invert the Small Target Deep Target normal pitch combination of target signals to different size targets. Normally, a large/deep target has a falling-then- �����������...

  • Page 42: Tracking Speed Keeping Up With Changing Ground

    Every time you switch from Fixed to Tracking on the front control panel, or via the Quick-Trak button, the GPX-4500 will initiate a very fast auto Ground Balance. The Tracking Speed does not affect the speed of the initial very fast auto Ground Balance.

  • Page 43: Iron Reject

    Discrimination is dependent on target signals being other) so that the detector probability that valuable targets will not be missed. strong enough for the GPX-4500 to determine if the 'sees' the target from target is ferrous or non-ferrous. If the signal is weak When Iron Reject is turned off no iron targets will be different profiles.

  • Page 44: Iron Reject Rejecting Ferrous Targets

    Iron Reject Rejecting Ferrous Targets Range Off (All Metal), 1–10 Not all targets are clearly ferrous or non-ferrous. A Tip: Iron Reject will give A low level of Iron Reject requires a stronger ferrous lot of targets could be described as 'maybe' ferrous. the best results when used signal before discrimination occurs.

  • Page 45: Custom Name

    Custom Name Custom Names When creating your own custom mode, in one of the four Custom Search Mode options, you can Patch personalise the mode by selecting a name from Bedrock the list. Pinpoint For example, if you regularly detect in exposed Gridding bedrock you can set your own Custom 'Bedrock' Diggings...

  • Page 46: Pinpointing / Locating The Target

    Pinpointing Locating the Target Note: Accurate pinpointing To find an object, and reduce the size of the hole Tip: If detecting on loose To pinpoint a detected target sweep the general is also important to required to remove it from the ground, it is necessary dirt or gravel you can area with the coil taking note of where the strongest prevent damage to the...

  • Page 47: Recovering The Target

    9 Once the target is in your hand, transfer half of the dirt to the other hand. Test each handful of dirt across the coil. Note: The GPX-4500 is a 10 If the target is too small to see drop the dirt onto ‘motion’ detector. This...

  • Page 48: Detecting Tips

    Follow these hints and techniques to help you to Do not try to eliminate what might appear to be For Maximum Gold Big Gold utilise the power of your GPX-4500, to ensure that a faint, isolated ground noise by balancing the Recovery every trip is a success.

  • Page 49: Commander Coils

    Commander Coils The GPX-4500 is supplied with the 11" Double-D coil. 18" Round Double-D This coil has an excellent combination of depth, sensitivity A serious coil for the serious operator. The 18" Double-D and stability. punches deep through heavy mineralisation, while running...

  • Page 50: Choosing The Right Coil For The Job

    Ground Balance and therefore possibly Monoloop cases the use of coils not more noisy. A Double-D coil is often more stable in designed for the GPX-4500 heavily mineralised areas. may cause the detector to be unstable and noisy.

  • Page 51: Troubleshooting

    • Move away from thunderstorm build-up mineralised ground), good depth and compensate for the effects of ground sensitivity, and a very thorough mineralisation. The GPX-4500 has Battery will not charge • search pattern. 'automatic Ground Balance'. When Check that there is power to the accessories...
  • Page 52 Glossary of Terms (Continued) Hot Rock Monoloop Coils Salt Mineralisation Threshold An individual rock which has a high Monoloop coils are the style of coil Salt content in the ground causes a The continuous audible level of sound degree of mineralisation in comparison where the multiple strands of wire are negative (–) response rather than the emitted by the detector is referred to...

  • Page 53: Taking Care Of Your Detector

    Taking Care Technical Specifications of Your Detector (Taking Care of your Battery, pg. 21) Detector The GPX-4500 is a high quality To prevent dirt entering between the Transmission Bi-Level Pulse Induction electronic instrument. Take care of your coil and the skidplate, silk tape (e.g.

  • Page 54: User Preferences

    User Preferences Main Menu: Range: User Preferences: Main Menu: Range: User Preferences: Backlight Off, 1–8 Backlight Off, 1–8 Volume Limit 1–20 Volume Limit 1–20 GB Type General GB Type General Specific Specific GB Off GB Off Special Salt-Coarse Special Salt-Coarse Sens Extra Sens Extra Sens Smooth...

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