Whites DXF Uživatelský manuál stáhnout pdf (Strana 35)

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 off-

set 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

conduc-

tive

(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 rejec-

tion 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 oc-

cur even if COARSE & FINE G.E.B. are matched

exactly to a particular targets V.D.I. number.

(G.E.B./Trac section)

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 automati-

cally bump up the Coarse

G.E.B.

setting by one

increment so that ﬁ ne ad-

justment can continue un-

interrupted. 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 mecha-

nism. Settings from 0-255

are available, coarse and

ﬁ ne.

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 59 60

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