While the
LCD
(Liquid Crystal Display) is very accurate in identifying buried
objects, the user in the field does not always maintain the display screen in his
field of vision. Therefore, we have incorporated an audio feedback mechanism
to alert the user to the nature of buried objects. This audio feedback system first
alerts the user to the presence and classification of objects, whose nature and
location can be confirmed using the
LCD
display.
The detector will sound three different tones. These three tones correspond to
the three target categories depicted on the
LCD
display.
LOW TONE
Ferrous objects, such as
iron and steel, will induce
a low tone. Small gold
objects can also induce
a low tone.
MEDIUM TONE
Pull-tabs, newer pennies
(post-1982), larger gold
objects, zinc, small brass
objects, and most bottle
screw caps will induce
medium tones. Many
recent vintage foreign
currencies will induce
medium tones.
HIGH TONE
Silver and copper coins,
larger brass objects,
older pennies (pre-1982),
and highly oxidized metals
will induce high tones.
Quarters, dimes and other
precious coins fall into
this category.
12
9
BASIC OPERATION
(continued)
The RIGHT SIDE of the display classifies objects into three categories.
Silver/Copper:
Objects composed of silver and cooper will
illuminate this arrow. Buried and heavily
oxidized metal objects, such as old tin
cans, can also fall into this category. Larger
aluminum objects, like beverage cans, will
sometimes fall into this category.
Mid-Range:
Mid-range objects cover a large variety of
metals, including pull-tabs from beverage
containers, nickels, medium-sized gold
objects, some types of aluminum, and
zinc.
Iron:
All ferrous objects, and some smaller
aluminum objects, fall into the iron
category. Small gold objects can also fall
into this range.
The
BOTTOM RIGHT SIDE
of the display will
illuminate a Low Battery Indicator symbol if
the batteries are discharged. The indicator
illuminates, and remains illuminated, when
the 9-volt batteries have discharged to a
level of 7.35 volts.
Reading the Display IN THE FIELD
With the detector in use in the field, the display will indicate both the
DEPTH
and
the
TARGET IDENTIFICATION
of each object detected. After a target is detected,
these indicators will remain illuminated with this information until the next target
has been detected.
AUDIO TARGET IDENTIFICATION
Audio Target Identification (ATI)
classifies metals into three categories.
LOW TONE
Nails, Bottle Caps,
& Small Gold
MEDIUM TONE
Old & New Pull Tabs, Zinc
Pennies (Post 1982), Nickel,
Larger Gold Objects
HIGH TONE
Copper, Silver & Brass
Copper Pennies (Pre 1982)
