CAPABILITIES AND LIMITATIONS (continued)
GROUND BALANCING
To achieve maximum depth in any detection mode, as well as when using the PinPoint feature, the
F75 offers the ability to cancel out ground minerals either by manual adjustment, or automatically
using the FASTGRAB feature.
If you do not perform the ground balancing operation, the Discrimination mode will usually still
work fairly well, but the ALL METAL modes will not. The Pinpoint feature can be used for
pinpointing objects at moderate depth in most soils without prior ground-balancing.
The internal computer will not cancel salt water, so when detecting on wet ocean beaches, ground
balancing must be done manually.
DISCRIMINATION
Discrimination refers to a metal detector's ability to ignore metal objects in selected categories,
especially iron and aluminum. This makes searching much more pleasant in an area with a lot of
metal trash. The F75 offers a wide variety of discrimination features which you can select
according to the search conditions and your personal preference.
DEPTH READING
The estimated Depth Reading displayed when pulling the PinPoint toggle is based on the strength
of the signal. It is calibrated for typical coin-sized objects. Smaller objects will read deeper than
they actually are, and large objects will read shallower than they actually are.
AIR TESTING
There may be times when you want to test or demonstrate the metal detector without sweeping it
over the ground, for instance, if not fully assembled, or if you are indoors. To air test, place the
searchcoil in a spot where the detector is stable and more than two feet away from any large masses
of metal, including the reinforcing steel usually present in concrete. If you are wearing a
wristwatch or jewelry on your hand or arm, remove it. Then, test or demonstrate by waving metal
objects over the searchcoil; wave objects briskly, several inches over the top of, and parallel to, the
searchcoil.
Ground balancing cannot be tested or demonstrated in air unless you happen to have appropriate
specimens of iron minerals available.
SWEEP SPEED
The F75 is noted for its quick response. This gives it unsurpassed ability to locate and identify
good targets surrounded by trash. It also permits the user to sweep the searchcoil quickly in order
to cover more ground with very little risk of losing targets. In general, if you are searching an area
where the desirable targets are more than 8 to 10 inches deep, a faster sweep speed will detect to a
greater depth and yield more accurate target IDs.
CHECKING A TARGET
In order to most accurately verify a detected target with most other metal detectors, users will
narrow their sweep and loiter over the top of the target. The F75 is different. The F75's quick
response and advanced signal sampling system produces the most accurate target IDs with
deliberate (shoulder width) sweeps all the way across the target, even if there are other targets
nearby. If you check targets using sweep techniques learned on some other detectors, you run the
risk of getting less accurate target IDs. You can use the confidence level indicator to improve your
technique.
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