Pinpoint Feature - Fisher Labs F 75 User Manual

PinPoint Feature

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 motion 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
balancing 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 indicate 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.
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™ pinpointer, a robust and
inexpensive device designed for this purpose.
Comprehensive Operating Manual & Guide to Metal Detecting
F75
23