Fisher Research Labs Pro-Arc Manual de usuario

Professional

Metal Detector

for the Archaeologist

USER’S MANUAL

PRO-ARC Comprehensive Operating Manual & Guide to Metal Detecting

The PRO-ARC is a professional-grade metal detector, designed specifically for the

Archaeological professional. It comes in a heavy duty travel case and includes

everything you will need on the dig site.

The best technology from the oldest company in the business, the PRO-ARC, by Fisher®!

PRODUCT FEATURES

• Lightweight and well-balanced: best ergonomically engineered detector in the

industry.

• Intuitive menu-driven user interface

• Large LCD screen

• Visual indicators of important values such as:

Target Identification

Target Confidence

Target Depth (both running-depth and pinpoint-depth) Ground Mineralization

• Multiple Search Modes:

Discrimination

Static All Metal

Motion All Metal

• Trigger-actuated FASTGRAB™ ground balancing with manual override

Comprehensive Operating Manual & Guide to Metal Detecting PRO-ARC

• Waterproof 11-inch open-frame BiAxial™ searchcoil

Housing constructed of a carbon fiber-polycarbonate blend

• Optional 5” BiAxial™ searchcoil

• Trigger-actuated target pinpointing with variable audio pitch

• Fully Adjustable Armrest

• Display backlight for night and low-light conditions

• Notch and discrimination controls

• Covers provided for both the control housing and battery box

• Durable travel hard case and battery charging kit

• Pin flags and Rite-in-Rain notebook

• Headphones

• Made in the USA

If you have any questions, or need assistance with your metal detector,

Call 1-915-225-0333, and ask for Fisher Hobby Technical Service

PRO-ARC Comprehensive Operating Manual & Guide to Metal Detecting

Table of Contents

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7

Quick Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-9

Mechanicals

Assembly Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-13

Mechanicals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-15

Armrest adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Using Headphones (included) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Introduction to the PRO-ARC

General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18-19

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20-23

Menu System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24-25

Ground Balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26-31

Motion All Metal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32-33

Static All Metal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-35

Discrimination Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36-45

PinPoint Feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46-47

LCD Visual Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48-53

Numeric Target Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48-49

Probable Target Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49-50

Depth Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Confidence Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Comprehensive Operating Manual & Guide to Metal Detecting PRO-ARC

Fe3O4Graph . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51

Battery Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Ground Balance (GB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Setting Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52

Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52-53

Backlight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

Frequency Shifting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54-55

Capabilities & Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..56-61

Tips & Techniques

Search Techniques

How to sweep the searchcoil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .62-63

Boost and Cache Locating Processes . . . . . . . . . . . . . . . . . . . . . . . . . . .63-65

Pinpointing targets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .65-66

Estimating target size and depth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .66-68

False signals and chatter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .68-70

Ground minerals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70-71

Hot Rocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71-72

Adjusting Sensitivity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73

Tips on ground balancing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73-75

Shallow Water Hunting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .75

Salt Water Hunting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76

How metal detectors work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76-77

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Back Page

PRO-ARC Comprehensive Operating Manual & Guide to Metal Detecting

Specifications

Mechanical: S-rod with electronics housing mounted on handgrip, 3-piece

breakdown, batteries under elbow, 2-way armrest adjustment -

forward/backward & around forearm.

Searchcoil: 11” (28 cm) open-frame elliptical double-D, waterproof.

Batteries: 4 AA, alkaline (included).

Weight: 3.5 pounds (1.6 kg) with alkaline batteries installed.

Static Balance: force in vertical plane normal to elbow 0.47 pounds (0.22

kg).Varies with adjustment and user's stance and arm/hand

physiology.

Dynamic Balance: axial moment, 0.29 foot-pounds (0.39 newton-meters). Varies with

adjustment and user's stance and arm/hand physiology.

Sweep Effort: lateral moment 5.2 foot-pounds (7.1 newton-meters).

Operating Principle: VLF induction balance

Operating Frequency: nominal 13 kHz, quartz crystal timing reference 13158Hz,

13100Hz, 1043Hz, 12987Hz, 12931Hz, 12876Hz, 12821Hz

Comprehensive Operating Manual & Guide to Metal Detecting PRO-ARC

Basic Sensitivity: 6 x 10 9 root Hertz (detectivity)

Lag Coefficient: 78 milliseconds

Reactive Overload: Approximately 10,000 micro-cgs units (volume susceptibility)

40,000 micro-cgs units with sensitivity < 30.

Resistive Overload: Approximately 1,200 micro-cgs units (volume susceptibility) 4,800

micro-cgs units with sensitivity < 30.

Ground Balancing Range: From ferrite to salt, inclusive

Discrimination

Ground Suppression: Combination of second and third order methods

ID Ground Suppression: Third order

Battery Life: Typically 40 hours with high quality alkaline batteries

Estimated 80 hours with nickel oxyhydroxide batteries

Estimated 65 hours with lithium iron disulfide batteries

Operating Temp Range: 4 to +122 degrees F (-20 to +50 degrees C)

Operating Humidity Range: 0-90% non-condensing

PRO-ARC Comprehensive Operating Manual & Guide to Metal Detecting

Quick Start

Use your PRO-ARC right out of the case

1. Assemble the detector (see instructions beginning page 10).

2. Install four AA alkaline batteries. All positive (button-end) terminals point up.

3. Turn the knob, located under the armrest, fully clockwise. This turns the machine on and

sets audio volume to maximum.

4. When first turned on, the PRO-ARC starts out in the Discrimination Mode, with:

Sensitivity preset to 60

Discrimination Level preset to 10

Number of Tones preset to 3

Process# preset to dE

Sweep the searchcoil from side to side, parallel to the ground. Keep the searchcoil

moving over the ground. If you stop moving the searchcoil, the sound will also stop.

Probable target type will be indicated at the top of the LCD screen.

5. If the searchcoil is not in motion and not close to metal, the detector should be silent.

6. If you experience false signals from electrical interference, from the soil itself, or from lots

of trash metal, press the MENU button.

Sensitivity will be highlighted.

Comprehensive Operating Manual & Guide to Metal Detecting PRO-ARC

Quick Start (continued)

Rotate the Settings knob to the left (counterclockwise),

Reduce the sensitivity setting until the false signals go away.

After 7 seconds, the machine will exit the menu and return to normal operation.

7. Find a patch of ground free of metal, toss a coin on the ground and sweep back and forth

over it a few times to get a feel for how the machine responds.

8. You are now ready to search.

9. Pull and hold the trigger switch with your index finger to pinpoint the exact location of

targets, making them easier to unearth.

When the trigger is pulled, PinPoint is engaged ….

The searchcoil need not be in motion to detect an object.

The 2-digit numeric display indicates approximate target depth, in inches.

PRO-ARC Comprehensive Operating Manual & Guide to Metal Detecting

Assembly

1. Remove all components from box.

2. Attach searchcoil to lower rod by lining up the holes.

Push coil knob through hole and tighten knob gently.

You will tighten up the coil knob later.

3. Insert smallest rod into S-rod (S-rod holds detector body).

Turn top locking collar counterclockwise to open up. Push in pin on small rod. Slide

small rod into upper rod. Click pin into hole and tighten locking collar firmly clockwise.

4. Push lower rod into small rod as follows:

Turn locking collar counterclockwise to open up. If plastic insert tab interferes, push it

down, or turn tube upside down. Push in pin to allow rod to slide in. Slide lower rod in.

Click pin into any hole.

5. Remove Velcro strip from lower rod.

6. Wrap cable around stem as follows:

Leave some slack in cable at base of lower rod. Secure cable at base of rod with Velcro

strip. Wrap cable loosely around entire stem up to bent part of upper rod. You will re-wrap

the cable later after sizing the rods to your height.

7. Push cable into connector on back of housing.

Do not twist the cable or plug.

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