Pinpoint Feature - Fisher Labs F70 User Manual

OPERATING MANUAL

Pinpoint Feature

After a buried target has been located using the Autotune
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 pressing-and-holding the
PINPOINT button. Unlike the Autotune 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 search coil
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 pressing-and-holding the Pinpoint button, the
audio tone will get louder as you lower the search coil 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 press-and-
hold PINPOINT, and raise the search coil slightly while passing it over the target.
HOW TO PINPOINT
Position the search coil an inch or two (2.5-5cm) above the ground, and to the side of the
target. Then press-and-hold PINPOINT. Now move the search coil 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 search coil near the center of the
response pattern (but not at the exact center), release the PINPOINT button and then
press-and-hold it again. Now you will only hear a response when the search coil 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, you must change the SENSITIVITY
setting.
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 search coil 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.
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GUIDE TO METAL DETECTING