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21
IN THE FIELD TECHNIQUES
- Pinpoint Mode
5. Lower the search coil to the
ground, maintaining it
elevated about 1/2 inch above
the surface (be sure that this
ground does not contain
metal).
• If the detector
emits
sound
with the search coil 1/2 inch over the ground, further
ADJUSTMENT IS NECESSARY
.
• If the detector
remains silent
with the searchcoil 1/2 inch over
the ground, no further adjustment is necessary; the detector is
“GROUND BALANCED”.
6. If the detector emits sound with the coil over the ground in STEP 5,
further adjustment of the ground balance KNOB is required as
follows:
• Lift the search coil waist high
• Rotate the ground balance KNOB clockwise 1/16 of a turn
• Press PINPOINT
• Lower the search coil to the ground again
If the detector still emits a tone, repeat this procedure. You are
searching for the ground balance knob position where the detector is
just silent
.
It is important to move the knob in small increments in order to find
the first setting (moving clockwise) at which the detector remains
silent. To insure yourself of the optimal adjustment, move the KNOB
slightly counterclockwise from a silent-adjusted position to check for
the
most counterclockwise silent position possible.
If the KNOB is over-adjusted in the clockwise direction, the detector
can lose sensitivity. An over-adjusted condition can also cause the
detector to sound off when the coil is lifted away from the ground.
As your search takes you to different areas, verify the ground balance
setting periodically using the above procedure. Within a geographical area,
ground conditions can change. Varying elevations, proximity to water, and
concentrations of rock, sand or clay can all affect ground condition and
sometimes require recalibration with the ground balance knob.
• If the detector
remains silent
with the search coil 1/2 inch over
the ground, no further adjustment is necessary; the detector is
“GROUND BALANCED.”