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Detecting Technique
Correct detecting technique is important to get the most out of your
detector. The techniques described will give you the best chance of
success. .
Holding the Detector
Insert your arm through
the armrest and
armrest strap. Grasp
the handle of the
detector and rest your
forearm in the
armrest.
Adjust armrest position
The correct position of the armrest should
allow you to comfortably grip the handle.
Your elbow should sit just above the back
of the armrest and the detector should feel
like an extension of your forearm.
Adjusting the Angle of the Coil
1. Loosen the yoke nut and bolt that fastens the lower shaft
to the coil. It should be loose enough to allow the coil to be
moved for adjustment, but tight enough that the coil can hold
its position.
2. While holding the detector in the detecting position, lightly
press the coil to the ground until it sits at/parallel with the
ground. The coil should remain parallel when lifted to the
sweep height, approximately 25 mm (1-inch) above the
ground.
3. Tighten the yoke nut just enough to hold the coil in position.
Sweeping the Coil
GF650 series detectors are motion detectors, meaning that
the coil must be moving across the ground in order to detect
a target. If the coil is held stationary over a target, it will not be
detected. The side-to-side detecting motion is called 'sweeping'
or 'swinging' , and with practice will become a comfortable and
fast way to cover ground.
Sweeping the coil incorrectly can cause you to miss targets or
can generate false signals.
Though the coil assembly is rigid and durable, sudden jolts or
bangs may cause random signals and inaccurate Target IDs,
as well as excessive wear and tear. Careful sweeping will
ensure the coil performs to an optimum level at all times.
Sweep Parallel to the Ground
You will obtain the best performance when the coil is swept
close and parallel to the ground at all times. This will
maximise detection depth and improve the response to small
objects. Avoid excessive brushing of the coil on the ground.
Overlap Your Sweep
Practice sweeping the coil over the ground in a side-to-side
motion while slowly walking forward at the end of each sweep.
Slightly overlap the previous sweep to ensure full ground
coverage.
An average sweep speed is 2 to 3 seconds from
right-to-left-toright.
Targets
Metal objects are referred to as targets. Targets are comprised
of ferrous and non-ferrous metals. Ferrous metals are those
containing iron such as steel, nails and some types of coins.
Nonferrous metals are those which are not magnetic, such as
gold, silver, copper, bronze and aluminium.
You may wish to nd a range of both ferrous and non-ferrous
targets.
Examples of Common Targets:
• Desired ferrous target – war artefact
• Undesired ferrous target – iron nail
• Desired non-ferrous target - gold coin
• Undesired non-ferrous target - pull-tab
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