Instruction manual

Notch Discrimination on the X-TERRA
Ever wonder what you're missing?
Part one: Friday, September 24, 2010
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The X-TERRA 70 and 705 have 28 pre-determined notch segments. Each
notch segment is represented by an even number ranging from a low of
-8, to a high of +48. These numbers represent the conductive properties
of your targets. The lowest number, -8, represents the least conductive
(most ferrous) targets you will encounter. In turn, the highest number,
+48, represents the most conductive targets (least ferrous) that you will
encounter. Ferrous targets are those targets with high levels of iron. Large,
deeply buried ferrous targets can (and will) occasionally provide a target
response similar to a highly conductive target. I’ve found, by implementing
the multiple tone mode on my X-TERRA, and slowly dragging the coil away
from the target while X-ing over it, I am able to hear changing harmonic
tones (and bouncing TID numbers) as the target leaves the eld of
detection. If you are using a single tone for all ferrous targets, -8, -6, -4 and
-2 will sound the same, making the identication of those deep ferrous
targets dicult to dierentiate.
In Part Two, I’ll provide examples of gold and silver targets you may be
walking over, by using too much discrimination.
Randy Horton (Digger)
You’ll never know for sure... unless you dig it!
www.minelab.com/treasure-talk
For the sake of discussion, I will make reference to the Target Identication
(TID) scale of the X-TERRA 70 and 705. I will also be using the factory values
of Pattern 2, to demonstrate my thoughts. Although the X-TERRA 30, 305, 50
and 505 are similar, the notch segments do have a slightly dierent value. So,
if you are using the X-TERRA 30, 305, 50 or 505, adjust the numbers I’m going
to provide, to match your notch segments and TID scale.
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Discrimination scale on the X-TERRA 705