GROUND BALANCING (continued)
Positive and Negative Response
The purpose of ground balancing is to adjust the metal detector to ignore ground minerals.
If the setting is incorrect, ground minerals will give either a positive or a negative response,
depending on which direction the adjustment is off.
POSITIVE RESPONSE
If the G.B. setting is too high a number, the response of minerals will be positive. This
means that when the searchcoil is lowered to the ground in PinPoint, Stat, or Motion All
Metals mode, the sound will get louder as the searchcoil approaches the ground. The sound
will grow quieter as the searchcoil is raised. What, if anything, you will hear in
discrimination mode depends on the discrimination setting.
When searching in an All Metals mode, if ground balance is properly set to cancel the
ground, and you sweep over a positive hot rock, the rock will give a “zip” sound similar to
that of a metal object.
NEGATIVE RESPONSE
If the G.B. setting is too low a number, the response of minerals will be negative. When
the searchcoil is lowered to the ground in PinPoint, Stat, or Motion All Metals mode, the
machine will be silent. The machine will sound off as the searchcoil is lifted away from
the ground. What, if anything, you hear in discrimination model depends on the
discrimination setting.
When searching in Motion All Metals mode, a negative hot rock will produce a “boing”
sound after passing over it, making it difficult to know where it is located. It will not have
the sound and “feel” of a metal object.
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