5
Comprehensive Operating Manual & Guide to Metal Detecting
PRO-TECH
TERMINOLOGY
The following terms are used throughout the manual, and are standard terminology
in regard to professional metal detectors.
Elimination
Reference to a metal being "eliminated" means that the detector will not emit a
tone, nor light up an indicator, when a specified object passes through the
searchcoil's detection field.
Discrimination
When the detector emits different tones for different types of metals, and when
the detector "eliminates" certain metals, we refer to this as the detector
"discriminating" among different types of metals.
Discrimination is an essential feature of professional metal detectors.
Discrimination allows the user to ignore trash and other undesirable objects.
Iron
Iron is a common, low-grade metal that may be an undesirable target in certain
metal detecting applications. Examples of undesirable iron objects are old cans,
pipes, bolts and nails. In most Dig Site situations, you will want to recover all of
the metal targets, including the iron.
Ferrous
Metals which are made of, or contain, iron.
Pinpointing
Pinpointing is the process of finding the exact location of a buried object. Long-
buried metals can appear to the eye exactly like the surrounding soil, and can
therefore be very hard to isolate from the soil.
V.C.O.
Meaning "voltage controlled oscillator," the V.C.O. audio method causes both the
audio pitch and the volume to rise as signal strength increases. V.C.O. improves
the user's ability to interpret a target's size and depth. Very weak signals (for
small or very deeply buried objects) have the faintest volume and the lowest
pitch. Larger objects, and those closer to the searchcoil, will create a higher
volume and higher pitch sound.
Ground Balance
Ground Balancing is the ability of the detector to ignore, or "see through" the
earth's naturally occurring minerals, and only sound a tone when a metal object
is detected. The PRO-TECH incorporates proprietary circuitry and programming
to eliminate false signals from severe ground conditions.
32
PRO-TECH
Comprehensive Operating Manual & Guide to Metal Detecting
PRO-TECH SPECIFICATIONS
Mechanical: S-rod with electronics housing on rod, 3-piece breakdown construction,
nonmetallic telescoping lower rod, adjustable position armrest
Weight: 2 lbs, 8 oz (with battery installed)
Standard searchcoil: 10-inch widescan searchcoil
Optional searchcoils: 5-inch widescan searchcoil
11-inch widescan searchcoil
Batteries: Single 9 volt rectangular alkaline battery (included)
Operating principle: VLF induction balance
Operating frequency: 19 kHz, crystal controlled
Reactive overload: 10,000 micro-cgs (with standard searchcoil)
Resistive overload: 1,200 micro-cgs (with standard searchcoil)
Ground balance range: From ferrite to salt water inclusive
Discrimination ground suppression: Combination of 2nd and 3rd order methods
Target-ID ground suppression: 3rd order
Battery life: 15+ hours on good quality alkaline
Operating temp range: 14 to 122 degrees F (-10 to +50 C)
Operating humidity range: 0 - 90% noncondensing
