Minelab X-Terra 505 Manuel d'instructions télécharger pdf (Page 77)

My circular discrimination theory would likely apply to all VLF detectors with notch

discrimination capabilities. But for the sake of explanation, I’ll use the 705 as my example.

If I were to ask you what direction, in degrees, that straight North represented, what would

you say? Is it 360 degrees? Or is it 0 degrees? Actually, it is both. Take a look at your compass.

Many of us think of metal detector discrimination as being linear. In our minds we can

visualize a straight line, running horizontally, with the most ferrous targets located on the left

end. And the highest conductive targets clear over on the right. In the case of the X-TERRA 70

and 705, there are 28 target notches spaced evenly in between.

Understanding your X-TERRA - Technology

The X-TERRA doesn’t give any indication that its discrimination arrangement is circular. In

fact, the X-TERRA stops scrolling when you try to go lower than the lowest non-conductive

number, or higher than the highest conductive number. I submit that is what leads us to

think of it as being linear. But I believe, just like a compass, that the Discrimination Scale is

circular, not linear.

Follow me along on this... Take that at line of notch segments and bend them into a circle,

like the numbers on a clock. Instead of twelve numbers representing the hours, we have

28 separate notch segments, evenly spaced in a circular pattern. Starting at the top and

moving clockwise, they range from a low of -8, to -6, -4, -2, +2, +4 ... on and on, all the way

around the dial to the +48. The spacing between each notch segment is the same, including

the space between -8 and +48. If you have a target that has a TID that bounces between

36 and 38, you know it is a target with a fairly high conductivity. With a TID of 36 to 38, it is

most likely a dime. If you have a target that reads a -4, and jumps down to a -6, you might

not know what it is. But it is denitely a target with a low conductivity (or high ferrous)

content.

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shhshh 23 Jan 2024 | 16:17:44

Minelab X-Terra 505 Manuel d'instructions Page 77