Pinpoint Feature - Fisher Labs F75 User Manual

After a buried target has been located using the All Metal or Discrimination modes, you
want to pinpoint the exact location of the target in order to facilitate its recovery. Accurate
target pinpointing will minimize digging.
Activate the PinPoint feature by pulling the trigger switch located under the housing.
Unlike the All Metal and Discrimination modes, PinPoint does not require motion to detect
metal. PinPoint will detect objects while the coil is in motion and will continue to detect
metal if searchcoil motion stops over the target.
Ground Pick-Up
If you have not performed the ground balancing procedure, the PinPoint feature usually
causes the ground to sound off. This means that while pulling the pinpoint trigger, the
audio tone will get louder as you lower the searchcoil to the ground; this is called ground
pick-up. Since you want to hear the target, rather than the ground, we recommend first
ground balanc ing in order to eliminate ground pick-up. Alternatively, if you experience
ground pick-up, you may place the coil very close to the ground, off to the side of the
target; then pull the trigger, and raise the searchcoil slightly while passing it over the target.
How to Pinpoint
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.
Narrow It Down
To further narrow the field of detection, position the searchcoil near the center of
the response pattern (but not at the exact center), release the trigger, and then pull it
again. Now you will only hear a response when the searchcoil is right over the top
of the target. Repeat this procedure to narrow the zone even further. Each time you
repeat the procedure, the field of detection will narrow further.
Controlling Sensitivity in PinPoint mode
If you wish to change the PinPoint sensitivity setting, go to the STATIC ALL
METAL mode, and then use the sensitivity feature on the right side of the menu to
make this adjustment.
Buy a Pinpointer
When you kneel down to unearth the desired object, you may find it frustrating as the
object may appear exactly like the surrounding soil. You may hold the object in your hand,
and find it necessary to pass a handful of dirt over the searchcoil to see if it contains metal.
An easier way is to use a handheld pinpointer. It is a probe-like device which is poked into
the ground, making close up pinpointing a snap, reducing digging time, and minimizing the
size of the holes you will dig. Fisher Research Labs offers the FPoint
robust and inexpensive device designed for this purpose.

PinPoint Feature

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