Ferrous Limits; Upper And Lower Limits; Lower Limits - Minelab MANTICORE Instruction Manual

Ferrous Limits

The Ferrous Limits setting allows you to
control whether the detector classifies
targets as ferrous or non‑ferrous based on
their ferrous and conductive properties�
This setting is very similar to the Iron Bias setting in other
Minelab Multi‑IQ detectors, but provides far more control
over how it is applied to targets�
There are a range of Preset settings to choose from that
are suitable for most detecting conditions, or you can create
your own Custom Ferrous Limits� A customised Ferrous
Limits pattern is able to reject difficult ferrous junk items, or
can accept desirable ferrous items like ferrous coins�
The Ferrous Limits setting is local, however changes made
to the Custom Ferrous Limits settings are Global and
available in all Search Modes�
The Ferrous Limits setting is disabled when using
single frequencies� To enable Ferrous Limits,
change the Frequency to Multi‑IQ+�
See "Change the Frequency" on page
Ferrous Limits
9
4
Preset
Ferrous Limits in the Settings Menu� There are two main Ferrous Limits
options; Preset and Custom�
For the Preset setting, the currently selected Preset Limits are indicated by
the overlaid numbers�
CONTENTS

UPPER AND LOWER LIMITS

The ID Map is divided in‑half horizontally, creating Upper
and Lower Limits�
Upper Limits

Lower Limits

Upper Limits
The Upper Limits control the ferrous classification of most
iron objects� This includes the most common small iron
objects such as screws and nails, which typically appear in
the top half of the ID Map�
Increasing or closing the Upper Limits (moving them closer
to the centreline on the ID Map) will classify more targets
as iron, and result in less iron falsing� However, this will also
reduce target separation performance (the ability of the
detector to separate good targets from nearby iron)�
38�
Conversely, decreasing or opening up the Upper Limits
(moving them further away from the centreline) will classify
fewer targets as iron and increase falsing on iron, but will
also increase target separation performance�
Ferrous Limits
Lower Limits
The Lower Limits control the ferrous classification of some
types of flat iron objects such as bottle caps and pieces
Custom 4
of sheet metal, which often appear in the lower half of the
ID Map�
Increasing or closing the Lower Limits (moving them closer
to the centre line on the ID Map) will classify more flat
iron objects completely as iron� However, this may also
reduce depth on some deep targets in mineralised ground,
particularly low‑mid conductors�
Decreasing or opening the Lower Limits (moving them
further away from the centre line) will classify fewer flat
iron objects as iron, but may also improve depth on some
deep targets in mineralised ground�
Bottle caps often have an ID within the 0–40 range, which
is why the Preset Lower Limits have a raised region in this
zone of the ID Map�
47