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The most accurate GND PHASE value is the value displayed when “pumping” the search
coil over the ground in an area free of metal.
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 displays two kinds of ground data:
1) The type of mineralization (which affects where the ground phase should be
set). This id GND PHASE.
2) The amount of mineralization (the greater the amount of mineralization, the
greater the loss of detection depth & ID accuracy; his loss is more pronounced in
DISC 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 in 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.
The goal of the Ground Balancing procedure is to eliminate the sound as the search coil
is being pumped over the ground. In some souls, the sound is not completely
eliminated.
After balancing to ground with GG some users may want to further adjust the ground
balance point manually.
To manually adjust ground balance:
1) Operate in ALL METAL Mode
2) Pump search coil up and down over the ground as in the GG procedure.
3) Press + or – while pumping.