Operating In Discrimination Mode; Ground Grab (Gg); Setting The Controls; Gain - Fisher Gold Bug DP Owner's Manual

OPERATING IN DISCRIMINATION MODE

Notice the segment status along the arc, and the discrimination parameters they
represent, vary as you adjust the discrimination level with
For DISC values at bottom right-hand corner of screen) up to 40:
(
- Operation is tone discrimination only
• No targets are eliminated from detection
- Target IDs less than the DISC value induce a LOW tone
• Represented by shaded segments
At DISC value = 41:
- Target elimination begins
•Targets in the blank segment region are not detected.
- Target IDs less than the DISC value induce a LOW tone
• Represented by shaded segments
At DISC values over 41:
- The LOW tone range of targets progressively shrinks
• Represented by shaded segments
- Target IDs less than the DISC value induce a LOW tone
• Represented by shaded segments
At DISC value = 80:
- All detected targets induce V.C.O. tones.
• Represented by solid segments
- There are no LOW tones
- No targets under 80 are detected.
Here is an example of one possible setting:
Values from 20 to 49
will induce a LOW tone
Values less
than 20 will
NOT BE
DETECTED
This discrimination interface for the Gold Bug DP was designed especially for relic-hunting.
Relic hunters want control over what sizes of iron are detected, and also control over
which targets are detected with a low-tone. Target values of 40 or less are ferrous.
20
-
+
or .
Suggestion: Try changing the
settings, watch the screen, and pass
objects over the searchcoil at each
setting. It will quickly become obvious
how these controls work.
Values from 50 to 100
will induce V.C.O. tones
(see p.25)
This value
and higher
will induce
V.C.O. tones
OPERATING IN DISCRIMINATION MODE
Discrimination is used to eliminate trash metal objects (e.g. nails, foil, pull-tabs) from
detection. The searchcoil must be in motion to detect metal. The Discrimination mode
is less sensitive to small and deep objects than the All-Metal mode.

Ground Grab (GG)

This feature is not available in Discrimination mode.
Your best results will be achieved by first performing the GG procedure in All-Metal mode.
The ground balance setting achieved using GG will carry over into this mode.

Setting the Controls

As you adjust any of the controls, notice that the values on the bottom-right of the
display indicate the settings of the value you are changing.

GAIN

If you are new to metal detecting, start with the GAIN at a low enough setting that you do not
hear any sounds when the searchcoil is sweeping across the ground, with no metal present.
Start with GAIN at the 12:00 position, or less.
In this mode, Gain refers to the detector's sensitivity. The higher the setting, the deeper
objects can be found, and the more sensitive the detector is to very small metal objects.

MODE

The right knob is not used in the Discrimination mode.
Click the right knob 100% counterclockwise.
If you turn the knob to the right, you will leave Discrimination mode, entering All-Metal mode.

DISC LEVEL

+
Press to eliminate unwanted metals from detection.
+
Each time you press the Disc Value at the bottom-right of the display will increment by one.
+
Press-and-hold to increase the Discrimination level rapidly.
See the Target Identification section of the manual for a detailed description of this function.
Sections of the arc with no indication represent metals completely eliminated from detection.
Sections of the arc with a lightly shaded indication represent metals detected with
a low tone.
–
Press to detect metals which were previously eliminated from detection

Unwanted Noise

Read the section on Electrical Interference.
This is a highly sensitive device.
It is intended for use outdoors. Indoor operation will subject it to electrical interference
from a wide variety of devices in the home or office.
In Discrimination mode, when you sweep the coil over the ground it will usually be quieter than
when holding the detector still.

Sweeping the Searchcoil

As you sweep the searchcoil over the ground, try to keep the coil parallel to the ground.
Avoid lifting the searchcoil at the end of your sweeps.
Operating in Discrimination Mode continued on next page
17