The Basics Of Metal Detecting; Ground Minerals; Trash; Identifying Buried Objects - Fisher F11 Owner's Manual

THE BASICS OF METAL DETECTING

This metal detector is intended for locating buried metal objects. When
searching for metals, underground or on the surface, you have the following
challenges and objectives:
1. Ignoring signals caused by ground minerals.
2. Ignoring signals caused by metal objects that you do not want to find,
like nails.
3. Identifying a buried metal object before you dig it up.
4. Estimating the size and depth of objects, to facilitate digging them up.
5. Eliminating the effects of electromagnetic interference from other
electronic devices.
Your metal detector is designed with these things in mind:
All soils contain minerals. Signals from ground minerals can interfere with

1. Ground Minerals

the signals from metal objects you want to find. All soils differ, and can
differ greatly in the type and amount of ground minerals present. This
detector has proprietary circuitry to automatically eliminate interfering
signals from minerals that occur naturally in the ground.
NOTE: This detector will not completely eliminate interference from all
types of minerals. For example, the detector IS NOT designed for use on
wet sand saltwater beaches. Another example of soil this detector will not
eliminate is any soil containing large concentrations of iron oxides, which
are usually red in color.
If searching for coins, you want to ignore items such as aluminum foil and

2. Trash

nails. You can see the Target-ID of the buried objects, listen to the sounds
and then decide what you want to dig up. Or, you can eliminate unwanted
metals from detection by using the NOTCH feature.
Metal objects are identified along the 9-segment Conductivity graphic

3. Identifying Buried Objects

symbols. This scale is an indicator of the relative electrical conductivity of
different objects. Segments to the right indicate more conductive targets. Iron
objects, which are usually of lesser value, illuminate on the left with the Fe
symbol. Silver objects will be illuminated on the rightmost segments.
The 6-segment graphic indicates the relative depth of a buried metal object.

4. Depth of Buried Objects

For a given object, the more distance between it and the searchcoil, the
more segment lines illuminated.
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