Operating In Discrimination Mode; Ground Grab ® (Gg) Computerized Ground Balancing; Setting The Controls; Gain - Fisher Pro-tech User Manual

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PRO-TE H
Comprehensive Operating Manual & Guide to Metal Detecting

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) Computerized Ground Balancing
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 the Discrimination 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.
When 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.
Sections of the arc with a bold indication represents metals detected with a high 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.
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Comprehensive Operating Manual & Guide to Metal Detecting
OPERATING IN DISCRIMINATION MODE (continued)

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.

Using PINPOINT

Press-and-Hold the Pinpoint button to narrow down the location of a buried metal object.
Pinpoint is a mode of detection which does not require the searchcoil to be in motion.
A motionless searchcoil held over a metal object will induce 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 objects.
Relative depth is indicated for larger or smaller objects.
Upon releasing the button, you will return to the motion Discrimination detection mode.
If you keep the Pinpoint button depressed for a long time, the audio tone may begin to drift.
If you plan to search like this, release and re-press the button periodically to avoid
drift. Drift may result in a loudening sound or a reduced sensitivity with no sound.
See the manual section on Target Pinpointing for how to narrow down a target's location.
This technique is indispensable as long-buried metals can look exactly like the
surrounding soil to the naked eye and very small objects can be difficult to see
in the loose dirt.

Reading the Display

TARGET-ID
Each time you pass the searchcoil over a metal object, a 2-digit value will appear in
the center of the display. See the manual section on Target Identification for a better
understand of these values.
Three segments will simultaneously appear above the arc at the top of the screen.
This represents the same target identification.
Target Scale
This display works as in the All Metal Mode.
The arc across the top classifies metal objects.
Each time a target is detected three segments will illuminate above the arc.
The segments will remain illuminated for three seconds.
This indication shows the approximate classification of the buried metal object.
See the section on Target Display for a more detailed explanation.
Iron is on the left. Silver and copper metals are to the far right.
SIGNAL
Each time a target is detected, bars will illuminate showing the strength of the target's signal.
If all 7 bars illuminate, the target signal is strong.
This may be a large metal object.
Operating in Discrimination Mode continued on next page
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