SEARCH TECHNIQUES
Sweeping Searchcoil (this does not apply to Pinpointing with the trigger switch)
Keep the searchcoil in motion to detect targets. Sweep the searchcoil parallel to the
ground; do not lift the searchcoil at the end of the sweep.
When you have located a target and continue sweeping back and forth for verification, use
broad, deliberate sweeps across the target for the most accurate target ID. Do not use short
sweeps as you might with other metal detectors.
Shallow Targets
Shallow targets tend to give multiple responses, with the last response being the one that
remains illuminated on the visual display. This last response is usually sampled at the edge
of the searchcoil and will tend to be inaccurate. If you suspect a shallow target (within 2 to
3 inches of the searchcoil), lift the searchcoil slightly, and slow down your sweep speed
until you notice a single response consistently in the same place.
Large shallow targets can cause signal overload, indicated by the siren sound. In these
instances, raise the searchcoil until the overload warning disappears, and sweep at this
increased height.
Large Targets
If an overload warning is not confined to a small spot, you are probably overloading on a
large object, for example, a large iron pipe, reinforcing steel in concrete, or buried sheet
metal. It is usually not possible to locate objects, such as coins, in close proximity to large
masses of metal.
Pinpointing With the Trigger Switch
When you turn the F75 on, the ground balance setting is preset to give a positive response
on nearly all soils. This means that if you are pulling the pinpoint trigger, the audio tone
will get louder as you lower the searchcoil to the ground. But you do not want to hear the
ground; you just want to hear the target. So always Ground Balance first.
After you have discovered a buried metal target using the ALL METAL or
DISCRIMINATION Modes, use the trigger switch to pinpoint its exact location.
Position the searchcoil an inch or two (2.5-5cm) above the ground, and to the side of the
target. Then pull the trigger. Now move the searchcoil slowly across the target, and the
sound will communicate the target’s location. As you sweep from side to side, and hear no
sound at the ends of the sweep, the target is located in the middle of that zone, where the
sound is loudest and the audio pitch is highest. If the sound is loud over a wide area, the
buried object is large. Use the PinPoint feature to trace an outline of such large objects.
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