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Glossary of Medal Detecting Terms

This might help answer some questions. Nevertheless, feel free to contact us with questions.

Air Test
A test performed by moving various sized metal samples beneath the metal detector searchcoil to check the detector's features and target response. This test is not an accurate indicator of ground depth penetration capability.
A type of battery able to sustain longer periods of current drain with greater storage life when compared to standard carbon-zinc type.
All Metal
Any operating mode or control setting, which allows total acceptance of any type of metal targets. Usually associated with the ground balance mode.
Audio ID
See tone ID.
Audio Response
See Target Response
Auto Tune
Circuitry, which continuously retunes the detector's threshold to the initial manually, tuned audio level. The retuning rate following target rejection or drift can be preset or variable.
Back Reading
A false signal, when operating in the discriminate mode, caused by a rejected target coming within one inch of or contacting the searchcoil bottom.
Beaver Tail
The tail of a pull-tab separated from the ring...usually giving the same signal as nickels and gold rings.
Bench Test
An air test to determine at what approximate discriminate settings various metal samples are rejected or accepted. The test is conducted in a non-metallic area.
Black Sand
One of the most extreme components of nonconductive, negative ground minerals. Also called Magnetite or magnetic iron oxide.
Body Mount
A configuration whereby the control housing is separated from the control shaft and fastened to the operator's body lessening arm fatigue and expanding usability for shallow water hunting. Also known as hip mount.
Any intentionally buried or secreted hoard of valuables.
The most common standard dry cell battery type.
See Searchcoil
Coin Depth Indicator
A visual indicator used in conjunction with calibrated circuitry to indicate depth of buried coins in inches or millimeters.
A searchcoil configuration using one or more transmit and one receive windings having unequal diameters aligned on a common center, most recently arranged on the same plane and called coplanar concentric.
Conductive Salts
One of the major mineral types, which make up the positive ground matrix. Wet, ocean-salt sand produces a positive rise of metallic type response on an air-tuned threshold.
The measure of a metal targets ability to allow eddy current generation on its surface.
Control Housing
A metal or plastic box which holds circuit boards, indicators, meter, controls, and power supply.
A metal detector configuration allowing versatility in operator handling, i.e., hand held to body mount.
Any searchcoil configuration in which transmit and receive windings occupy the same level or plane.
Crystal Controlled Oscillator
A transmit oscillator employing a crystal to maintain stable output frequency.
Depth Penetration
The greatest measure of a metal detector's ability to transmit an electromagnetic field into the soil matrix and produce a target signal.
Detection Pattern
The densest or strongest region of the searchcoil's electromagnetic field where detection occurs. Its shape is balloon and changes in size directly proportional to target surface area.
Adjusting the audio threshold into the null or less sensitivity tuning zone. Also a method of narrowing a target signal width manually for precise pinpointing. This is accomplished by retuning to audio threshold over the target response area.
See Discrimination.
Adjustable circuitry which ignores or nulls audio responses from a specific conductivity range allowing positive responses to be heard from metals higher in conductivity above the discriminate control setting. Designed primarily to eliminate audio response from trash metals. See also Motion Discriminator.
Double Blip
A signal characteristic common to elongated ferrous targets such as nails or coins lying close to the surface detected in the All Metal no-motion mode.
Double D or 2 D
See Wide Scan.
A loss of threshold tuning stability caused by temperature change, battery condition, ground mineral content or detector design.
Eddy Currents
Small-circulating currents produced on the surface of metal by the transmitted electromagnetic field. These currents then produce a secondary electromagnetic field, which is then detected by the searchcoil receiver windings resulting in inductive imbalance between the windings.
Electromagnetic Field
An invisible force extending from top and bottom of the searchcoil created by the flow of alternating oscillator frequency current around the transmit winding. See also Detection Pattern.
Electronic Pinpointing
An automated detuning feature which narrows signal response for the purpose of target pinpointing.
Elliptical Coil
A searchcoil with an ellipse shape. This coil can be either concentric or wide scan type.
Faint Signal
A sound characteristic of targets that are sometimes deeply buried or very small in size.
False Signal
An erroneous signal created by over shoot, ground voids or highly mineralized hot rocks. See also Back-Reading.
A metal foil wrapping of the searchcoil windings or metallically painted searchcoil housing interior for the purpose of eliminating electrostatic interference caused by wet vegetation.
Descriptive of any iron or iron bearing material.
Ferrous Oxide
An oxidized particle of iron which generally becomes nonconductive and makes up the natural negative ground mineral matrix. Hematite, which is also an iron oxide (Fe2O3), will respond as positive or metallic. See also Black Sand

The number of complete alternating current cycles produced by the transmit oscillator per second. Measured in cycles per second.

VLF Very Low Frequency = 3 to 3O kHz

LF Low Frequency = 30 to 300 kHz

MF Medium Frequency = 300 to 3000 kHz

HF High Frequency = 3 to 30 MHz

Frequency Shift
A feature, which suppresses the audio interference (cross talk) between two detectors using identical, transmit frequencies in close proximity.
Ground Balance
A state of operation using specialized circuitry to ignore the masking effect that iron ground minerals have over metal targets.
Ground Balance - Factory Preset
A feature which eliminates the manual ground balance control and its adjustment from the operator's setup procedure. This adjustment is performed internally by the factory to optimize operation over an average range of nonconductive soils.
Ground Balance - Manual Adjusted
A feature requiring a manual control adjustment procedure to neutralize the effects of negative minerals in the search matrix.
Ground Balance - Self Adjusting
A feature which senses change in ground mineral content and continuously readjusts the ground balance while in operation. Sometimes called Ground Tracking or Automatic Ground Balance.
Ground Filter
Complex circuitry found in motion-type detectors which separates mineral signal from the metal signal allowing it to be further processed by the discrimination circuitry.
Halo Effect
Certain metals when buried for long periods oxidize and leech into the surrounding soil. This results in a Metallic Halo around the buried object
Hand Held
A metal detector configuration whereby the operator holds a shaft or handle which supports the searchcoil and control housing. Also called pole mount. Head: See Searchcoil.
Prolong battery life, increase a persons concentration due to blocking out external noise, and allows you to better hear subtle differences in discrimination and depth indications.
Hz or Hertz
Cycles per second. See also Frequency.
Hip Mount
See Body Mount.
Hot Rock
A rock which contains a higher concentration of nonconductive ground minerals than the surrounding matrix to which the detector is balanced. A metallic (positive) response will be heard in the motion and non-motion modes and a null or negative drop in threshold is heard in the all-metal, ground balance mode over these rocks.
A nonmetal stem which attaches the searchcoil to the control shaft eliminating metallic interference in the detection pattern. On some detectors, the entire lower shaft is made of a nonmetal substance.
kHz or Kilohertz
1 000 cycles per second. See also Frequency.
LCD or Liquid Crystal Display
Used on a metal detector as a graphic visual indicator same as a meter/needle indicator.
LED or Light Emitting Diode
A semiconductor which produces an illuminated visual response.
See Searchcoil.
Loop Cover
See Scuff Cover.
Refers to the total volume of ground penetrated by the transmitted electromagnetic field-which may contain varying amounts and combinations of minerals, metals, salts and moisture.
Metallic substances such as iron, foil, nickel, aluminum, gold, brass, lead, copper, silver, etc.
Metal Detectorist
A person operating a metal detector in the field. This name is preferred by many over Treasure Hunter.
A detector component that provides visual information to aid in target identification. Meters feature either an LCD or needle indicator which may display intensity of signal, target depth, target identification, type of metal, or battery condition.
Mineral-Free Discriminator
Any metal detector that can reject or ignore trash metals while simultaneously balancing ground mineralization.
Mineralized Ground
Any soil that contains conductive or nonconductive components.
A condition of operation, selected by the operator, for specific desired function(s)
Motion Discriminator
A detector type that requires searchcoil motion to activate its simultaneous ground balance and discriminate functions. See also Mineral-Free Discriminator and VLFFTR.
Narrow Response
A target that produces an audio response so short that pinpointing is almost not needed.
Negative Ground
Soil that contains nonconductive minerals which have a negative or nulling effect on an air-tuned threshold.
Neutral Ground
Soil that has no nonconductive or conductive mineral properties. Lacks mineralization.
Ni-Cad or Nickel-Cadmium
A rechargeable type of battery cell. If you use your metal detector every week rechargable batteries will save you money. Today's rechargable batteries are superior to those designed just a few years ago.
Not of iron. Metals of the precious class (i.e., gold, silver, copper, etc.)
Refers to any mode of operation that does not require searchcoil motion to trigger target response. Also called non-motion.
Notch Accept
except those the instrument is adjusted to accept in the notch "window.
Notch Discrimination
iltering circuitry which allows a "window of desirable targets to be accepted within the entire rejection range of unaccepted targets, i.e., rejecting nails, foil and pull-tabs while accepting nickels and gold rings of the same conductivity. This circuitry can also be adjusted to reject all metal targets while accepting only a specific conductivity range.
Notch Level
A control used to select the target level or target conductivity which the notch filter will act upon.
Notch Reject
peration whereby all targets within the notch width at chosen notch level will be "tuned-out.
Notch Width
finite discrimination range of target conductivities ("window) at the chosen notch level.
The zone just below audible threshold in metal detector tuning. This also refers to the momentary drop or quiet response of threshold sound as the searchcoil passes over a discriminated or rejected target.
The amount of searchcoil swing advance not greater than the searchcoil's physical diameter.
A common false signal heard as the searchcoil passes over a rejected target when using a no-motion All Metal mode in conjunction with automatic retuning. Excessive tuning restoration pushes the audio above threshold level creating a positive response at the edges of target detection periphery.
Phase Response
The length of time between eddy current generation sustained on a metal's surface and the resultant secondary electromagnetic field effect on the searchcoil's receive winding. Related to target conductivity.
Finding the exact target location with respect to a searchcoil's designated center. Accomplished by interpreting the centers of audio response width in perpendicular directions or scans. See also Detuning.
Positive Ground
Soil which contains conductive minerals or moist salts which have a positive or upward effect on an air-tuned threshold.
PI or Pulse Induction
A mode of operation where the transmitter circuit pulses an electrical current into the ground before it quickly shuts down. The eddy currents dissipate immediately from poor conductors such as wet salt sand and ground minerals. Metals hold eddy currents because they are better conductors. When the receiver circuit comes on, it picks up the returning signal from metal; the eddy currents in the ground minerals have already disappeared.
Quick Response
A short time period between metal sensing and peak audio/ visual indicator indication usually associated with all frequency ranges of TR detectors.
An indication of target non-acceptance by a null in threshold or broken sound while operating in a discriminate mode.
RF-Two Box
A radio frequency detector having its own transmit and receive windings separate and in an orthogonal configuration. This detector is capable of deep large object detection while naturally ignoring small targets such as nails and individual coins.
Refers to (1) the effective searchcoil detection width or (2) searchcoil movement over the ground.
The searchcoil is pressed and held in contact with the ground while searching to maintain even audio threshold. With newer detectors, this technique is used to gain depth.
Scuff Cover
A protective cover for the searchcoil bottom. Also called coil covers loop covers or skid plate. Scuff covers snap onto the bottom and protect your loops from excessive wear. They do not reduce detection depth.
Search coil
A circular (or other shaped) plastic housing containing single or multiple transmit and receive windings (wire coils) in a specific configuration. A searchcoil emits and receives signals from the ground and metal targets. Also called loop, coil or head.
Search coil Cable
An electrostatically shielded cable of conductors (wires) which convey signals to and from the searchcoil and control housing.
The capacity of a metal detector to perceive changes in conductivity within the detection pattern. Generally, the more sensitivity a detector can smoothly provide, the more depth it will achieve in sensing targets.
An audio response or visual indication alerting the operator that a target has been detected.
Signal Width
The total distance of ground an audio signal is sustained during searchcoil travel or scan.
Silent Search
Refers to detectors capable of producing a target signal while operating below the threshold audio. Also called silent operation.
Slow Motion
A description of searchcoil speed required to operate the motion discriminate mode.
The ability of a metal detector to maintain manually adjusted tuning threshold under the effects of outside interference. See also Drift.
Surface Area
Refers to the area of a target closest to the searchcoil where eddy current generation can take place.
Surface Mount
he art of mounting electronic components on the surface of a printed circuit board rather than using the "through board method. This allows more technology in a much smaller space and with much higher tolerances.
The motion employed in moving the searchcoil across the ground.
Refers to any object that causes an audio or visual response in a detector. Target Masking: When large sizes or high concentrations of trash metals drive the threshold into the null zone suppressing weaker, positive responses from deeper or smaller targets.
Target Response
See Signal.
A control which can be manually rotated ten times to cover the full electrical range of the function. Usually associated with tuning or ground balance function.
Test Garden
A mapped plot of buried targets at various depths to aid in learning characteristic target responses and in comparing metal detector performances under a given ground mineral content. Also called test plot or test bed.
TH'er, TH'ing
Universal word contractions for treasure hunter and treasure hunting. Also known as Metal Detectorist.
Continuous tone that establishes a reference point for tuning the detector to ground balance it. The threshold tone also establishes the minimum sound level for deep targets in the discriminate mode.
Tone ID
Circuitry producing different audio tones for each target's conductivity range, i.e., low tone for nickel, high tone for coin.
TR or Transmitter-Receiver
Term describing method of operation of early detectors. Some manufacturers still produce this type of detector. Electromagnetic field distortion caused by mineralized ground interferes with depth penetration as this type of detector does not ground compensate. It does balance conductive salt water effects so, it is primarily used in salt water and on low mineral salt water beaches or low mineral inland locations.
Visual ID
A feature in which a visual indication is produced to help identify the target.
Visual Indicator
A meter, LCD or LED that signals a target's presence.
VLF or Very Low Frequency
See Frequency.
Term associated with detectors capable of mineral-free operation in both the Discriminate and All Metal modes.
A class of detector that can operate in both the All Metal, Ground Balance mode and the No-Motion Discriminate, Non-Ground Balance mode.
Wide Response
A target that produces an audio signal over an area wider than the searchcoil diameter.
Wide Scan
coplanar searchcoil with two "D shaped transmit and receive windings positioned back to back and overlapping. This searchcoil type is capable of detecting a target across at least its full diameter. Also called Double-D or 2-D.
Zero Discrimination
Used to describe detectors whose discrimination control allows the acceptance of all metals at zero setting.

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