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PRO-TECH
Comprehensive Operating Manual & Guide to Metal Detecting
TARGET DISPLAY and AUDIO
SIGNAL Indicator
The lower-left bar graph designates
SIGNAL strength only when operating in
Discrimination Mode.
The signal strength indicator at the bottom-
left of the screen indicates how large or
close the buried metal target is.
If all bars are illuminated, the target is large
or close to the searchcoil.
If one or two bars are illuminated, the
target is far away or small, or both.
DEPTH Indicator
When operating in Discrimination Mode, a
target's location and size can be verified
using the PINPOINT control.
Press PinPoint to temporarily detect metal
without searchcoil motion, and a monotone
hum.
While holding the PinPoint button, the
DEPTH indicator will appear. The number
beneath DEPTH represents the distance of
the object, in inches, from the searchcoil.
The Depth scale is calibrated to coin-sized
objects. For objects other than a coin, the
numeric value is a relative measure of the
target's depth.
AUDIO FEEDBACK
When a target is detected, the PRO-TECH
will respond with two types of sound:
1. V.C.O. (Voltage Controlled Oscillator),
is an audio response with variable
pitch and volume.
2. A LOW tone beep.
In Discrimination Mode, targets which fall
into the zone along the arc whose segments
are shaded will be identified with a LOW
tone beep and solid segments with a V.C.O.
As the user sets the discrimination level
with the + and - buttons, he is determining
which targets will induce the low tone, and
which will be eliminated.
All targets' audio responses in All Metal
Mode will be V.C.O.
V.C.O. (Voltage Controlled Oscillator), is an
audio response which provides a good feel
for the target.
The stronger the target signal, the higher
26
the volume and the higher the audio
pitch.
Very weak signals will have the faintest
volume and lowest pitch.
For this reason, the use of headphones
is always recommended for detecting the
smaller and deeper targets.
2-DIGIT TARGET INDICATOR
In Discrimination Mode the 2-digit target
indicator, in the middle of the screen,
provides a specific target value to help
identify buried targets more accurately.
With practice in the field, you will learn to
associate target values with the probable
identification of buried objects. The target
value can vary each time the searchcoil
passes over the target, depending upon the
orientation of the object and its distance
from the searchcoil.
As a starting point, refer to the table below.
TARGET Readout
The table below lists some common
approximate
target
experience in the field, you will
recognize many types of metal objects
by their numeric value.
OBJECT
foil from gum wrapper
U.S. nickel (5¢ coin)
aluminum pull-tab
aluminum screw cap
zinc penny (dated after 1982) typically 78
aluminum soda pop can
copper penny, clad dime
U.S. quarter (25¢ coin), clad
50¢ coin, modern clad
old silver dollar coin
US silver Eagle $1 coin
Caution:
The target indications are
visual references. Many other types of
metal can also be represented by a given
Target-ID.
values.
With
TARGET-ID
47 - 48
typically 58
60 - 75
70 - 80
75 - 85
typically 83
typically 85
typically 87
typically 89
typically 91
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