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Operating in ALL METAL Mode
The ALL METAL Mode is more sensitive than the Discrimination Mode, and it used to find
all types of metal objects in the ground. The search coil 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 detector, so you want to
cancel out this mineral signal coming from the ground, and only detect the signal from
metal objects in the ground.
So before using your detector, set in ALL METAL Mode and perform the automatic
ground balancing procedure. Press and hold the GG button while pumping the search
coil up and down over the ground. Release the button when the sound evens out. The
GND BAL number on the bottom right of the screen is the detector’s internal setting
which cancel out the minerals in the ground. Different soils in different areas will require
different GND BAL settings, so balance to ground before you search. See the section of
Ground Balancing detailed description of this procedure.
Refer to the Ground Balancing section of this manual for a more in-depth description.
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.
If you are new to metal detecting, start with the GAIN and THRESHOLD controls at a low
enough setting that you do not hear too man unwanted sounds, like warble or a loud
hum. Set the GAIN at the 12:00 position, or less. Then set the THRESHOLD to a position
where you hear a very slight background hum, or if you prefer, dial the control just left
of that position to a setting where the detector is silent.
Unwanted
Noise
Read the section on Electrical Interference.
The TX-850 is a highly sensitive device. It is intended for use outdoors. Indoor operation
will subject to electrical interference from a wide variety of devices in the home or office.
