33
Comprehensive Operating Manual & Guide to Metal Detecting
PRO-ARC
22
PRO-ARC
Comprehensive Operating Manual & Guide to Metal Detecting
45
Discrimination Mode (continued)
include less noise and a slower response speed. In many situations, you may prefer to do
cache locating in the Motion All Metal Mode after first selecting the Cache Locating
process in the Discrimination Mode.
WHAT YOU SEE VS. WHAT YOU HEAR
The visual Target ID displayed on the LCD is based entirely on sampled processing; the
number displayed represents a snapshot of the target's identification as the searchcoil passes
over the object. When using these different processes, or methods, the detector's audible
response may differ from the visual. When using the different processes, there is not a 100%
correspondence between what you see and what you hear, especially on buried targets where
ground minerals influence Target ID and audible response. By making the audio and visual
systems independent, the PRO-ARC allows each system to do what it does best. The audio
is optimized for quick response and target feel, whereas the visual system provides the best
numeric resolution of Target ID.
36
Discrimination Mode
The Discrimination Mode is used to eliminate trash metal objects from detection, e.g. nails,
aluminum foil, or pull-tabs. The searchcoil must be in motion for metal objects to be detected.
Discrimination incurs some loss of sensitivity to small or deep objects. This mode can be used
if you wish to be selective in what you wish to search for.
The PRO-ARC discrimination system is much improved over conventional discrimination
systems. In older systems, the apparent sensitivity decreases as discrimination level
increases. The PRO-ARC's sensitivity may increase as discrimination increases, depending
on the process number and notches being used. Therefore, do not use the discriminator to
control sensitivity. First set the discrimination level and notches to establish objects to detect
or eliminate; then adjust sensitivity downward to eliminate interference, or upward to “work into
the noise,” if preferred.
SENSITIVITY This controls the signal gain, and is adjustable from 1 to 99. Unlike the All Metal
Modes, the Discrimination Mode is designed to operate silently. If you hear noise when there
is no metal present or when the searchcoil is not in motion, reduce the Sensitivity setting until
the machine goes quiet. NOTE: there is no interaction between the sensitivity settings of the
All Metal and Discrimination Modes.
33
Comprehensive Operating Manual & Guide to Metal Detecting
PRO-ARC
22
PRO-ARC
Comprehensive Operating Manual & Guide to Metal Detecting
45
Discrimination Mode (continued)
include less noise and a slower response speed. In many situations, you may prefer to do
cache locating in the Motion All Metal Mode after first selecting the Cache Locating
process in the Discrimination Mode.
WHAT YOU SEE VS. WHAT YOU HEAR
The visual Target ID displayed on the LCD is based entirely on sampled processing; the
number displayed represents a snapshot of the target's identification as the searchcoil passes
over the object. When using these different processes, or methods, the detector's audible
response may differ from the visual. When using the different processes, there is not a 100%
correspondence between what you see and what you hear, especially on buried targets where
ground minerals influence Target ID and audible response. By making the audio and visual
systems independent, the PRO-ARC allows each system to do what it does best. The audio
is optimized for quick response and target feel, whereas the visual system provides the best
numeric resolution of Target ID.
36
Discrimination Mode
The Discrimination Mode is used to eliminate trash metal objects from detection, e.g. nails,
aluminum foil, or pull-tabs. The searchcoil must be in motion for metal objects to be detected.
Discrimination incurs some loss of sensitivity to small or deep objects. This mode can be used
if you wish to be selective in what you wish to search for.
The PRO-ARC discrimination system is much improved over conventional discrimination
systems. In older systems, the apparent sensitivity decreases as discrimination level
increases. The PRO-ARC's sensitivity may increase as discrimination increases, depending
on the process number and notches being used. Therefore, do not use the discriminator to
control sensitivity. First set the discrimination level and notches to establish objects to detect
or eliminate; then adjust sensitivity downward to eliminate interference, or upward to “work into
the noise,” if preferred.
SENSITIVITY This controls the signal gain, and is adjustable from 1 to 99. Unlike the All Metal
Modes, the Discrimination Mode is designed to operate silently. If you hear noise when there
is no metal present or when the searchcoil is not in motion, reduce the Sensitivity setting until
the machine goes quiet. NOTE: there is no interaction between the sensitivity settings of the
All Metal and Discrimination Modes.