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line  of  defense  against  EMI.   

The  Threshold  control  only  applies  to  the  All  Metal

Mode.

EMI is usually easier to control in the All Metals Mode than in the Discrimination Mode.

on the Gold Bug

®

Pro, setting the discrimination level between 60 and 70 will usually

reduce  interference.    In  the  Discrimination  Mode,  the  detector  may  chatter  if  the

searchcoil is not in motion, but once you start sweeping it over the ground, the signal

from the ground will usually suppress the EMI chatter, except for an occasional pop or

click which will not sound like a real target. 
If  you  are  conducting  an  indoor  demonstration,  you  may  find  that  changing  the

orientation of the searchcoil will reduce the pickup of EMI. 
If you carry a cell phone or other high-tech electronic equipment while metal detecting

and you encounter EMI, try turning the device off and see if that solves the problem.

Turn such devices completely off, not just into standby mode. 
When working near overhead power lines, you may get the best results right under the

power line and the worst results when standing at a 30° to 45° angle to the power line.  
Many sources of EMI are intermittent.  You may find that an area which is difficult to

search at one time of day may be easier after 5 PM, or on weekends.   Power lines are

usually quietest late at night, and on weekend mornings.  
Small  searchcoils  usually  pick  up  less  EMI  than  larger  searchcoils.  on  a  site  with

severe electrical interference, a small searchcoil is often a better choice than a large

one.

Distinguishing Electromagnetic Interference from other problems

EMI will often vary as you walk around from place to place, and it will also vary with

changes in the orientation of the searchcoil.   This is almost never the case if there is

a functional problem with the metal detector itself. 
The most common cause of a noisy metal detector, where the problem is not EMI, is

a defective searchcoil.  If striking the searchcoil with your hand causes the noise to

start or stop, the problem could be a defective searchcoil.  Also, a defective searchcoil

often causes noise of a more intermittent nature than electrical interference.
The second most common cause is a loose searchcoil connector.  The noise from a

loose connector will usually be very erratic or intermittent in nature.  Try unplugging the

searchcoil and then reconnecting it to ensure the connector is firmly installed.
If you use a searchcoil cover, dirt or water can accumulate inside it, and movement of

those materials can cause false signals while sweeping the searchcoil.  Searchcoil

covers must be periodically removed and cleaned.

ELECTRICAL INTERFERENCE (EMI)

X. Click the MODE knob to the right. 

    

The detector is now in the ALL METAL Mode

    a. Keep GAIN set at the 12:00 position

    b. rotate the THrESHoLD knob 

slowly 

from the far counterclockwise

     position to the full clockwise position.

   Notice these attributes of the THrESHoLD control, with no metal

over the searchcoil.

i. at low settings you will hear no sound

ii. at mid-scale, there will be a transition point from no sound to

a barely audible, choppy sound.

iii. at full scale you will hear a loud, constant tone. It may also

have an irregular or choppy sound, as a result of electromag-

netic interference emitted from other electrical devices.

Use with headphones 

(not included)

The Gold Bug

®

Pro is equipped with a 1/4” headphone jack. Any headphones

with a stereo plug will work; headphones with a mono plug will not work. using

headphones extends battery life, and also prevents the sounds from bothering

bystanders. It also allows you to hear subtle changes in the sound more clearly,

particularly if searching in a noisy location. Gold nuggets are often very small, so

closely monitoring changes in sound using headphones will improve your gold

prospecting results. For safety reasons, do not use headphones near traffic or

where other dangers, like rattlesnakes, are present. This device is to be used

with interconnecting cables/headphone cables shorter than three meters.

IX.   Press-and-hold         

and hold the nickel over the searchcoil

a. Notice that motion is not required.

    A motionless object induces a hum.

b. Notice the variable pitch & volume hum.

c. Move the nickel closer to and farther away from the searchcoil. 

    Notice the changing “depth” values. 

QUICK-START  DEMONSTRATION

Содержание Gold Bug Pro

Страница 1: ...amouflage with Fisher logo FCCAP Fisher Coffee Mug 16oz stainless steel and plastic FMUG Fisher T Shirt 100 cotton with Fisher Logo Sizes S M LG XL XXL FTSHIRT Replacement Accessory Searchcoils 11 DD...

Страница 2: ...2 39...

Страница 3: ...ontrols 13 Control Panel 13 Control Knobs off on Gain 14 Disc All Metal Threshold 15 Touchpad Controls Ground Grab Computerized Ground Balancing Pinpoint 15 and 15 operating in All Metal Mode Ground G...

Страница 4: ...it n cessaire l tablissement d une communication satisfaisante Introduction to the Gold Bug Pro The new Gold Bug Pro is unique among gold prospecting metal detectors for its combination of high sensit...

Страница 5: ...he 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 Discrimi...

Страница 6: ...age Remove and dispose of any and all trash and litter found Appreciate and protect our inheritance of natural resources wildlife and private property Act as an ambassador for the hobby use thoughtful...

Страница 7: ...IDDLE STEM into the S roD with the SILVEr BuTToN pointed upward 5 rotate the MIDDLE STEM until the SILVEr BuTToN locates in the hole 6 Twist the LoCKING CoLLAr fully in the clockwise direction until i...

Страница 8: ...ies Do not use Heavy Duty batteries rechargeable batteries can also be used If you wish to use rechargeable batteries we recommend using a Nickel Metal Hydride rechargeable battery The battery compart...

Страница 9: ...rface Never swing the searchcoil like a pendulum WroNG CorrECT QUICK START DEMONSTRATION I Supplies Needed a Nail a Zinc Penny dated after 1982 a Nickel a Quarter II Position the Detector a Place the...

Страница 10: ...ctive searchcoil often causes noise of a more intermittent nature than electrical interference The second most common cause is a loose searchcoil connector The noise from a loose connector will usuall...

Страница 11: ...oth Wi Fi etc which often affect metal detectors overall the potential for electromagnetic interference is greater than it was just a few years ago Modern high end metal detectors are a lot more sensi...

Страница 12: ...r to always carry a magnet to help discriminate gold from hot rocks and iron Gold will not be attracted to a magnet Pieces of iron will always be attracted to a magnet Negative hot rocks will almost a...

Страница 13: ...ner s permission Prospecting clubs such as the Gold Prospector Association of America GPAA often own claims which are open to its members and sponsor group outings to productive gold prospecting areas...

Страница 14: ...e the loss of sensitivity resulting from discrimination is enough to cause those little nuggets to vanish If you have gone many hours without finding gold and are wondering if there is something wrong...

Страница 15: ...he object and its distance from the searchcoil As a starting point refer to the table below TARGET Readout The table below lists some common approximate target values With experience in the field you...

Страница 16: ...metal objects in the ground The searchcoil must be in motion for objects to be detected Ground Grab COMPUTERIZED GROUND BALANCING Naturally occurring minerals in soil look like metal to a metal detect...

Страница 17: ...duce a boing sound after passing over it making it difficult to know where it is located It will not have the sound and feel of a metal object GROUND BALANCING Reading the Display Most gold prospectin...

Страница 18: ...ts will be achieved by first performing the CoMPuTErIZED GrouND BALANCING procedure in All Metal Mode The ground balance setting achieved using CoMPuTErIZED GrouND BALANCING will carry over into this...

Страница 19: ...a hum volume and pitch of the hum increase with target strength The approximate target depth in inches will be indicated in the center of the screen The depth scale is calibrated to coin sized object...

Страница 20: ...T BE DETECTED Values from 20 to 49 will induce a LOW tone Values from 50 to 100 will induce V C O tones see p 25 OPERATING IN DISCRIMINATION MODE In Discrimination Mode pressing or will change two det...

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