DFX 300 Manual - White's Metal Detectors

Tips - Use for controlled
reactions to specifi c
minerals or hot rocks. The
Fine G.E.B. control when
adjusted to the top of the
scale, 255, will automatically
bump up the Coarse
G.E.B. setting by one
increment so that fi ne adjustment
can continue uninterrupted.
When adjusted
to the bottom of the scale,
0, Coarse G.E.B. setting
is automatically bumped
down by one increment so
that fi ne adjustment can
continue uninterrupted.
The entire Coarse G.E.B.
range is available on the
Fine G.E.B. control made
possible by this mechanism.
Settings from 0-255
are available, coarse and
fi ne.
(G.E.B./Trac section)
Chapter 5 DFX Pro Options
12. Fine G.E.B.
FINE G.E.B. is used to make smaller adjustments
to the Ground Balance range on either side of the
COARSE setting. The FINE setting combines
with the COARSE setting to determine the actual
ground rejection level. To determine exactly what
level the automatic Air/Ground sequence selected,
it is necessary to check both COARSE and FINE
levels.
Manual Ground Balance will rarely be used for
perfect balancing as the automatic balance is
extremely reliable. It is generally used to offset
Ground Balance for the same reasons AUTO
TRAC ® OFFSET is used.
In COARSE or FINE, lower numbers indicate a
Ground Balance setting toward the negative side
of the V.D.I. scale (iron). Larger numbers indicate
a Ground Balance setting toward the positive side
of the V.D.I. chart (salt). Bad ground conditions
(high mineralization) may be described as either
magnetic (negative or low numbers) or conductive
(positive or high numbers). COARSE and
FINE settings of 0 represent a ground rejection
similar to a V.D.I. number of -95. COARSE and
FINE settings of 255 represent a ground rejection
level similar to a V.D.I. number of +10. This V.D.I.
range from -95 to +10 represents the ground rejection
range of this instrument. If ground balance
(either automatic or manual) occurs near the 255
COARSE setting, signifi cant loss in sensitivity can
be expected to targets which indicate in the V.D.I.
number range of 1 to 10. However, manual ground
balance doesn't exactly work like a discriminator,
where V.D.I. numbers are simply REJECTED. The
actual phase of Ground Balance is out of sequence
with most targets; thus some responses will occur
even if COARSE & FINE G.E.B. are matched
exactly to a particular targets V.D.I. number.
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