Whites-electronics Spectrum XLT User Manual download pdf (Page 35)

Chapter 5 XLT

Pro Options

13. 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 rejec-

tion range of this instrument. If ground balance

(either automatic or manual) occurs near the 255

COARSE setting, significant 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.

128

FINE G.E.B.

MIN MAX

(G.E.B./Trac section)

Tips - Use for controlled

reactions to specific

minerals or hot rocks.

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Whites-electronics Spectrum XLT User Manual Page 35

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