metal detecting terms help. All about metal detectors

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metal detectors terms: AC (Alternating Current) – Metal detector modes that require loop motion to respond to metal.Air Test – Testing a metal detector’s response to various metallic samples with the loop held away from ground. All-Metal – Describes any mode or control setting allowing total acceptance of all types of metal targets, iron and non-iron. Audio Identification – Circuitry or mode producing different audio tones (pitches) for different target types. AutoTrac (Automatic Ground Tracking) – A feature that continually and automatically readjusts the ground balance (ground rejection) of a metal detector
during searching.

TERM EXPLANATION

All-Metal Mode A metal detector setting that detects all metal objects, no discrimination
Audio Threshold The background audio level produced when no target is being detected – it is best to adjust the audio threshold to the lowest audible level, and recommended the operator use headphones when treasure hunting
Audio Tone The pitch or frequency of the sound made by a detector. The tone on the GTI 2500, 1500 and GTP 1350 detectors can be adjusted on a treble to bass scale.
 Back Reading – A false target response caused by
either overloading due to a very strong target near the
loop, or a rejected trash target very close to the loop.
Cache Larger deposits of treasure that generally consist of money and valuable objects
Classifier A filtering device, typically found at the head of a sluice, which helps prevent rocks and other large debris from falling into a gold pan.
Coin Shooting Hunting for coins regardless of location or era of coins targeted
 Conductive Salts – One of the major mineral types
which makes up the positive ground matrix. Wet
ocean salt/sand will produce a positive indication
much like a metal target.
Composite Digger Trowel made of durable plastic that helps prevent coin damage during recovery. Ideal for soft terrain
Control Box Contains the detector’s main circuitry, controls, speaker, batteries and microprocessor chip
 DC (Direct Current) – Used to refer to metal detector
modes that do not require loop motion to respond to
metal targets.
DD Searchcoil A special configuration of the transmit and receive coils to minimize the effects of ground minerals
 De-tuning – A method of narrowing a target signal’s
width and length for precise pinpointing.
DSP (Digital Signal A highly advanced computer chip used in Garrett detectors and other sophisticated Processor) electronic equipment
Discrimination The ability of a metal detector to reject a target, such as a pull tab and foil or accept a target such as a coin or jewelry based on its metallic composition
FastTrack (See Garrett’s exclusive technology that analyzes ground mineralization and adjusts to “cancel” Ground Balance) its effects in a matter of seconds
Frequency The number of times per second the energy transmitted from a detector’s coil changes direction (e.g. 7.0 kHz = 7000 times per second) – higher frequencies are typically used to find targets such as gold nuggets, while lower frequencies are best for general purpose hunting.
Gold Pan A bowl-shaped, shallow container that traps gold flakes
Gravity Trap™ A patented gold pan made by Garrett which has 90 degree riffles to trap small gold
Ground Balance An adjustment made to “cancel” or ignore ground mineralization; may be done manually (See GroundTracking) or automatically
Ground Tracking The ability of a metal detector to continuously measure the ground’s mineralization and automatically adjust the detector’s ground balance setting for optimum performance
GTA (Graphic Target Analyzer) Exclusive Garrett technology that visually identifies a target’s conductivity or ID and also shows the discrimination pattern
GTI (Graphic Target Imaging) Exclusive Garrett technology that measures and displays a target’s true size and depth
LCD (Liquid Crystal Display) A graphical display that indicates target information, detector settings, etc…
Multiple Frequency See Pulse Induction and Multiple Frequency article
Microprocessor Computer chip that performs digital functions that make many features such as Target ID and Discrimination possible on today’s Garrett detectors
Mono Searchcoil Refers to searchcoils with one ring where both transmitter and receiver antennae are located
Motion Mode Refers to the setting where coil motion is needed to detect targets
 Negative Ground – Soil containing mostly magnetic
minerals.
Notch Discrimination Targets above and below these discrimination settings
 Null – A decrease in sound caused by rejection of targets
or ground mineralization.Oscillator – An electronic component or circuitry
designed to generate a specific rate of current frequency
to power the loop’s transmit winding.Overlap – Advancing each sweep of the loop in small
increments to insure good area coverage. Each sweep
should overlap the last by at least 50%.Overload – Occurs when the receiver of a metal detector
becomes overwhelmed due to too much signal
(ground and/or target).Overshoot – A false signal heard as the loop passes
over a rejected target when using a non-motion discriminate
mode in combination with automatic tuning.
Excessive tuning restoration pushes the audio above
the threshold level creating a positive response at the
edges of target detection.
Pinpoint A mode of operation that allows the operator to detemine the precise location of a target still in the ground
Pulse Induction Used primarily for heavily mineralized environments such as the beach or the gold fields of Australia and is found in many of today’s specialty detectors (See also Multiple Frequency)
PowerMaster Exclusive Garrett feature that increases the detector’s ability to detect deeper and wider – up to 20 percent
Probe A long screwdriver-like device usually made of brass used to penetrate the ground and physically locate a detected target before digging it up
Prospecting Hunting for valuable metals such as gold
Relic Hunting Hunting for targets with historical value, such as old battlefield items or family heirlooms
Salt Elimination A detector’s ability to eliminate the interference of salt mineralization, which adversely affects detection depth and target ID capabilities
ScanTrack A unique Garrett feature that automatically adjusts to the operator’s scan speed to achieve optimum performance
Searchcoil Also referred to as the “coil”, the searchcoil is the flat, typically circular disk swept over the ground to sense the presence of metal
Sensitivity Generally synonymous with Depth, the adjustment that determines how deep or small a target can be detected – the higher the sensitivity, the greater the detection depth
Shaft The adjustable stem that connects the control box and the searchcoil
Single Frequency Offers greater potential depth capabilities, better discrimination and enhanced target ID under most common soil conditions where most treasure hunting occurs (See Multiple Frequency article for more information).
Super Sluice™ Large 15″ gold pan with 1/2″deep riffles. Traps small gold nuggets up to one ounce and larger in size
Surface Elimination A detectors ability to ignore all targets located on or near the ground’s surface, which is useful in heavy trash areas
Surface Mount PC Board Technology The latest trend in constructing electronic circuit boards
Target Any metallic item sensed by a detector
 Target Masking – When large size or high concentrations
of trash metals, or extreme ground mineralization,
drive the threshold into the null zone suppressing
weaker positive responses.
Target ID Cursor A graphical indication of the target’s probable identity (e.g. coin, gold, pull tab) based on its electrical properties
Volume Control The ability to adjust the loudness of the audible response produced by the detection of a target

Zero Discrimination – Used to describe detectors
whose discrimination control allows the acceptance
of all types of metals when set to the zero position.

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