33
Comprehensive Operating Manual & Guide to Metal Detecting
PRO-ARC
22
PRO-ARC
Comprehensive Operating Manual & Guide to Metal Detecting
63
Search Techniques (continued)
the searchcoil until the overload warning disappears, and sweep at this increased height.
Large Targets
If an overload warning is not confined to a small spot, you are probably overloading on a large
object, for example, a large iron pipe, reinforcing steel in concrete, or buried sheet metal. It is
usually not possible to locate objects, such as coins, in close proximity to large masses of metal.
Using the special BOOST and CACHE LOCATING processes:
In situations where vegetation or other obstacles make it impossible to sweep the searchcoil close
to the surface of the ground, use the enhanced sensitivity of either the Boost (bP) or Cache (CL)
Locating process to punch through the extra distance to the target. Under most such conditions,
the Boost process will provide the best balance of depth and response. The Cache Locating
process will punch through even more distance to the target, but response is noticeably slower.
In the Boost and Cache Locating processes, if you sweep fast with the searchcoil close to the
ground, you will lose some target separation. This loss is most noticeable using the Cache
Locating process. Target separation in these processes is comparable to that of the default
process, provided that you slow down your sweep.
Some users, when fatigued after hours of searching, get sloppy with their sweep technique.
The Boost process is more tolerant of sloppy sweep technique than are the other processes
and may be preferred at these times.
18
Introduction to the Fisher PRO-ARC
HIGH PERFORMANCE The PRO-ARC is a multi-purpose high-performance computerized
metal detector. It has the high sensitivity and ground balancing control needed for all
types of environments, the discrimination responsiveness needed for target
concentrations under difficult conditions, and visual Target ID to facilitate searches for
specific types of artifacts. The PRO-ARC operates at 13 kHz for good sensitivity to both
high and low conductive artifacts such as gold and coins. The PRO-ARC comes with an
11-inch elliptical Bi-Axial searchcoil for maximum detection depth in mineralized soils.
USER COMFORT The PRO-ARC is among the lightest and best balanced of all high-
performance metal detectors, so you can hold and swing it almost effortlessly. The
armrest position is adjustable to fit your arm. The grip is durable high-friction foam
elastomer, comfortable in any kind of weather. The controls are conveniently located and
easy to learn how to use. Locking collars on the tubes eliminate rattling.
EASY-TO-USE & INFORMATIVE INTERFACE The entire menu is always visible on the LCD
display. The LCD display indicates the electrical signature (Target ID) of the detected
metal object. The display provides continuous information on battery condition and on
ground mineralization, which affects detection depth. Help messages are automatically
displayed on the bottom of the display when necessary.
LOW OPERATING COST The PRO-ARC is powered by four AA alkaline batteries, which will
typically last for more than 40 hours of use before needing replacement.
33
Comprehensive Operating Manual & Guide to Metal Detecting
PRO-ARC
22
PRO-ARC
Comprehensive Operating Manual & Guide to Metal Detecting
63
Search Techniques (continued)
the searchcoil until the overload warning disappears, and sweep at this increased height.
Large Targets
If an overload warning is not confined to a small spot, you are probably overloading on a large
object, for example, a large iron pipe, reinforcing steel in concrete, or buried sheet metal. It is
usually not possible to locate objects, such as coins, in close proximity to large masses of metal.
Using the special BOOST and CACHE LOCATING processes:
In situations where vegetation or other obstacles make it impossible to sweep the searchcoil close
to the surface of the ground, use the enhanced sensitivity of either the Boost (bP) or Cache (CL)
Locating process to punch through the extra distance to the target. Under most such conditions,
the Boost process will provide the best balance of depth and response. The Cache Locating
process will punch through even more distance to the target, but response is noticeably slower.
In the Boost and Cache Locating processes, if you sweep fast with the searchcoil close to the
ground, you will lose some target separation. This loss is most noticeable using the Cache
Locating process. Target separation in these processes is comparable to that of the default
process, provided that you slow down your sweep.
Some users, when fatigued after hours of searching, get sloppy with their sweep technique.
The Boost process is more tolerant of sloppy sweep technique than are the other processes
and may be preferred at these times.
18
Introduction to the Fisher PRO-ARC
HIGH PERFORMANCE The PRO-ARC is a multi-purpose high-performance computerized
metal detector. It has the high sensitivity and ground balancing control needed for all
types of environments, the discrimination responsiveness needed for target
concentrations under difficult conditions, and visual Target ID to facilitate searches for
specific types of artifacts. The PRO-ARC operates at 13 kHz for good sensitivity to both
high and low conductive artifacts such as gold and coins. The PRO-ARC comes with an
11-inch elliptical Bi-Axial searchcoil for maximum detection depth in mineralized soils.
USER COMFORT The PRO-ARC is among the lightest and best balanced of all high-
performance metal detectors, so you can hold and swing it almost effortlessly. The
armrest position is adjustable to fit your arm. The grip is durable high-friction foam
elastomer, comfortable in any kind of weather. The controls are conveniently located and
easy to learn how to use. Locking collars on the tubes eliminate rattling.
EASY-TO-USE & INFORMATIVE INTERFACE The entire menu is always visible on the LCD
display. The LCD display indicates the electrical signature (Target ID) of the detected
metal object. The display provides continuous information on battery condition and on
ground mineralization, which affects detection depth. Help messages are automatically
displayed on the bottom of the display when necessary.
LOW OPERATING COST The PRO-ARC is powered by four AA alkaline batteries, which will
typically last for more than 40 hours of use before needing replacement.
