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Comprehensive Operating Manual & Guide to Metal Detecting
PRO-TECH
GROUND BALANCING (continued)
Understanding ground conditions assists the user in setting up the machine, knowing
when to readjust ground balance and in understanding the responses of the machine
while searching.
This detector displays two kinds of ground data:
1. The
type
of mineralization (which affects where the ground phase should be
set). This is
GND PHASE
2. The
amount
of mineralization (the greater the amount of mineralization, the
greater the loss of detection depth & ID accuracy; this loss is more
pronounced in Discrimination Mode). This is
Fe
3
O
4
.
The goal of Ground Balancing is to equate the GND BAL number to the PHASE
number.
PHASE is the measurement of the ground.
GND BAL is the detector's internal setting which calibrates the detector to
the ground's phase.
Notice that the GND BAL number is three digits, with a decimal point. PHASE
has only two digits.
GND BAL is a higher resolution number, so may differ a bit from PHASE in
a perfectly balanced scenario.
After pumping and releasing GG, the exact measurement of the ground will
be transferred to the GND BAL setting.
The two-digit PHASE number displayed on the screen indicates the type of ground
mineralization.
Some typical ground mineralization types are:
0 - 10 Wet salt and alkali
5 - 25 Metallic iron. Very few soils in this range. You are probably over metal.
26-39 Very few soils in this range -- occasionally some saltwater beaches
40-75 Red, yellow and brown iron-bearing clay minerals
75-95 Magnetite and other black iron minerals
Ground Balancing continued on next page
14
PRO-TECH
Comprehensive Operating Manual & Guide to Metal Detecting
CONTROL PANEL
Control Knobs:
1. OFF/ON/GAIN
a. Click right to turn on. Click left to turn off.
b. Turning the knob clockwise increases the detector's sensitivity; the higher the
sensitivity, the deeper targets will be detected, and the more likely the detector
will be to detect very small targets.
c. As you turn the knob, notice that the GAIN value at the bottom-right of the
screen displays your current sensitivity setting.
Sensitivity in DISC Mode
The left knob is labeled “GAIN” and in DISCRIMINATION Mode it alone
controls the sensitivity of the detector.
GAIN in ALL METAL Mode
In All Metal Mode, GAIN increases as you rotate the knob clockwise.
Threshold is controlled independently using the right knob.
2. DISC / ALL METAL / THRESHOLD
a. Click knob to the far-left “DISC” position and the detector enters
DISCRIMINATION Mode.
b. Click on clockwise to operate in ALL METAL Mode.
c. In ALL METAL Mode, rotate knob to increase the threshold.
Threshold values range from -40 to +40.
In ALL METAL Mode, the Threshold control can be used in two ways.
Control knobs continued on next page
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