Instruction manual
Discrimination Patterns
28
The term notch segment relates to where the target is placed, in
regard to how ferrous or non-ferrous (conductive) it is. Each notch
segment on the X-TERRA is preprogrammed to accept targets within
a specic range of ferrous and/or conductive properties. Those
notches below zero represent ferrous targets. Those notch segments
above zero represent non-ferrous (conductive) properties. For
example, a U.S. nickel typically provides a Target ID (TID) of 12 on all
X-TERRA models.
The TID is the same on all models of X-TERRA because all three
detectors have the number 12 represented on their scales (12 is
divisible by 2, 3 and 4, representing the number of notch segments
on each model). For a U.S. silver three-cent piece, all three detectors
will likely register a TID of 24 (again, 24 is divisible by 2, 3 and 4). And
silver dimes can register a 36 on each of the models (same thing in
that 36 is divisible by 2, 3 and 4).
The thing to remember is that all three models have a maximum
and minimum range of conductivity. Again ferrous targets are
categorized in the negative notch segments. And conductive targets
will be found in the positive notch segments. The dierence between
the X-TERRA models is the number of notch segments assigned to
each model (see page 26).
As I mentioned, the 30 and 305 have 12 of those segments, meaning
all targets will be identied as having one of twelve possible TID
values. Each of those notch segments represents a four digit range
of numbers (counting by 4’s) -4, +4, +8, +12, +16, +20, +24, +28, +32,
+36, +40, +44.
The 505 has 19 segments, meaning all targets will have one of
nineteen possible TID values. Each of the 505 segments represents
a three digit range of numbers (counting by 3’s) -9, -6, -3, +3, +6, +9,
+12, +15, +18, +21, +24, +27, +30, +33, +36, +39, +42, +45, +48 (the
X-TERRA 50 is similar, with the exception of not having the +48 notch
segment).
Ferrous:
Ferrous objects/targets contain
iron and therefore are attracted
to a magnet.
Conductivity:
Conductivity refers to how well
a target allows electrical current
to ow through it. In other words
a highly conductive target has
low electrical resistance and
therefore allows current to ow
more easily. Conversely, a target
with low conductivity has high
electrical resistance and does not
allow current to ow easily.
Understanding your X-TERRA - Discrimination