White Spectra VX3 Instruction Manual download pdf (Page 59)

Page 5-6

Spectra VX

User’s Guide

Now the signal response starts at zero and still reaches approxi-

mately the same peak point (perhaps resulting in the same final

VDI), but shows some curvature on the way up and on the way

back. Because the SpectraGraph response is taken from the

whole of the signal response and not just the peak, this can

result in a “smearing” effect in the bars, as shown here:

Pay attention to the amount of smearing compared to the depth

and the composite VDI number. If it seems like it might be a

good target that’s just deep, then that is exactly the sort of target

you want to dig.

Trash targets, especially iron, can exhibit significant smear-

ing. To illustrate why, let’s look at the vector response of a bot-

tle cap:

Quarter

-95 +95

+83

Bottle

cap

-95 +95

+24

1 2 ... 54 55 56 57 58 59 60 61 62 63 64 ... 87 88

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White Spectra VX3 Instruction Manual Page 59