Teknetics Gamma 6000 Owner's Manual page 19

OPERATION and CONTROLS
GROUND BALANCING
When operating in ALL-METALS mode the goal is to eliminate the
sound as the coil is being pumped over the ground. In some soils,
the sound is not completely eliminated. If the ground balance
adjustment is incorrect, there will be a difference in the sound as the
searchcoil is either moving toward or away from the ground. It may
sound like you are either pulling the sound out of the ground, or
pushing the sound into the ground.
• If the sound is louder as you raise the searchcoil, increase the
ground balance setting.
• If the sound is louder as you lower the searchcoil, reduce the
ground balance setting.
NOTE: Experienced users often prefer to adjust the ground
balance to get a weak but audible response when lowering the
searchcoil. This is called adjusting for positive response.
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 or 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 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 or 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 mode depends on the
discrimination setting. When searching in 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.
continued
cont.
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