18
Ground Balance (continued)
Ground Balance Window
Axiom’s unique Ground Balance Window feature
helps overcome hot rocks and other localized ground
variations. Hot rocks are typically highly ferrous, iron-
based rocks that are either more or less conductive
than the surrounding soil, thereby creating a response
that can resemble a target.
Because of Axiom’s inherent immunity to most
normal soil minerals, hot rocks can typically be
eliminated by simply ground balancing to the hot rock
instead of the ground. But in extremely mineralized
soil, the Axiom must be ground balanced to the soil, in
which case the hot rock may produce a response.
To simultaneously eliminate the hot rock and the
mineralized soil, change the Ground Balance procedure
as follows. Instead of only pumping the coil up and
down above the soil, hold down the GND BAL button
while combining a verticle pump over the soil with
a horizontal scan across the hot rock in a repeating
pattern as shown. Be sure to very briey pause between
the verticle pump and the horizontal sweep to ensure
the ground and the hot rock create distinctive signals.
Continue until the ground and hot rock responses
are eliminated or become as small as possible. Then
release the GND BAL button.
HOT ROCK
Very brief
pause
Typical GB range
Ground / Target (Upper and Lower numbers)
Saltwater Upper: 0-15
Lower: 0-20
Moist salt bed / salty soil
Upper: 0-15
Lower: 0-20
Moist salt bed / salty soil mixed with ferrous
ground, some hot rocks or terra cotta
Upper: 15-45
Lower: 10-20
Typical ferrous ground without salts, most hot
rocks and terra cotta
Upper: 45-55
Lower: 20-35
Chunk of iron (e.g. large nail or spike)
Upper: 55-80
Lower: 30-60
Piece of non-ferrous metal (e.g. aluminum can)
Upper: 80-99
Lower: 60-99
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