26 Garrett Metal Detectors
AT Max
™
27
Iron Masking:
To prevent an iron object from "masking" out the
signal of an adjacent good target, use just enough discrimination
to barely reject the iron trash (e.g. small nail, as seen in Illustration
1). This will allow you to detect the coin and nail together (see
Illustration 2) and not miss/mask a good target.
Detecting Targets in Trash with High-Res Iron Discrim
In Illustration 1, the
AT Max
is operating
in Zero Mode with an IRON DISC
setting of 20. The nail seen in the
illustration registers from 18 to 24 on
the Digital Target ID scale. To eliminate
the nail from detection, increase the iron discrimination level to 24 using the
IRON DISC (+) button.
In Illustration 2, the same iron nail is
laying above a gold coin. Since the
Iron Discrimination level is now set
to 24, the nail by itself would not be
detected; however, the two objects
(nail and gold coin) have a combined conductivity of more than 24.
Therefore, the gold coin is detected due to the combined conductivity being
higher than that of the discriminated target (nail) alone.
Iron Discrimination
IRON DISC Buttons—
The
AT Max
features a high-resolution iron
discrimination adjustment. This additional resolution allows more
precise control of how much iron discrimination can be applied.
The level can be adjusted from 0 (no iron discrimination) to 44
(maximum iron discrimination).
Illustration 1
Illustration 2
Iron Discrimination
setting
IRON DISC Buttons
Use (+) or (-) IRON DISC buttons to adjust the Iron
Discrimination setting up or down.
