Bottle Caps; Nails; Ground Signal - Minelab MANTICORE Instruction Manual

Target Trace

Bottle caps

Bottle caps, complex targets and highly variable junk targets that have a combination of ferrous properties and conductive
properties very similar to coins generally appear in the bottom half of the map� The Preset Lower Limits settings in
Ferrous Limits (page 47) are designed to capture this area of the ID Map to assist in classifying bottle caps as ferrous�
If you repeatedly find the same type of bottle cap, choose a different Ferrous Limits Preset, or edit the Ferrous Limits to
cover the Target Trace� In general, a higher‑numbered Preset Lower Limits setting will be more effective at classifying
most bottle caps as ferrous�
Detection of a common brand beer
bottle cap (bottle cap A), detected
parallel to the Coil�
These Target Trace examples show the variation that is possible for a single bottle cap�
A different bottle cap (bottle cap B),
showing a different shaped Trace to
bottle cap A — bottle caps are highly
variable in composition, making
them difficult to discriminate�

Nails

Nails are highly ferrous objects that generally appear in
the top half of the ID Map, and can be easily managed by
adjusting the Upper Ferrous Limits�

Ground signal

The ground signal often appears at the very top of the ID Map around ID 35� The exact
shape and position varies depending on the ground conditions�
CONTENTS
(Continued)
The Lower Ferrous Limits edited to
cover the Trace and mask out the
bottle cap�
Bottle cap B is more difficult to
reject as iron, and requires a higher
Ferrous Limit Lower preset setting�
Bottle cap B laid at a 45 degree
angle� In this case the detector is
seeing both the flat shape of the
object, and the narrower sides of the
object, which tends to appear in the
upper ferrous region�
Detection of a nail�
28
Bottle cap B laid on edge (vertical)�
In this case the detector sees very
little of the flat shape of the object,
and the response lies in the upper
ferrous region�
The Upper Ferrous Limits edited to
capture the Trace�