Minelab X-Terra 505 Instrukcja Obsługi Pobierz pdf (Strona 80)

Q & A with Laurence

80Understanding your X-TERRA - Technology

If most metallic targets have both ferrous and non-ferrous

properties, what triggers whether a specic target registers in

the ferrous range (negative TID numbers) or the non-ferrous

range (positive TID numbers) on the X-TERRA?

 



There are three “ingredients” of a target that determin its TID.

These are:

1) Conductance

2) Inductance

3) Magnetic response

Ferrous Objects

Ferrous objects are very interesting, because they have all three properties:

• they have conductance – current ows through iron but not very well,

• they have inductance – due to their shape, the currents ow along

certain paths and cannot vary easily,

• they also have a magnetic response, because iron is a magnetic material

and enhances the magnetic eld.

Time delay

Transmit (Tx) and Receive (Rx) wave forms

Non-Ferrous Objects

Non-ferrous objects, for example gold rings or coins, lack the third ingredient

and thus they only have two properties:

• they have conductance – current ows through

them better if they are thick and if they have good

conductivity, like copper, aluminium, gold,

• they have inductance – rings and coins in particular

have well dened paths for the current due to their

symmetry.

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shhshh 23 Jan 2024 | 16:17:44

Minelab X-Terra 505 Instrukcja Obsługi Strona 80