14
3. Sweep the coil over the target, side-to-side
and front to back, to find the spot where the bar
graph peaks and the signal tone is loudest and
highest. Because the scan area of pulse-
induction metal detectors is fairly wide, further
pinpointing may be required, especially on large
or very shallow targets.
4. Readjust the TUNING control slightly
counterclockwise, throwing the instrument
slightly out of tune below the audio threshold
point. When the IMPULSE is detuned, the
sensitivity of the coil is decreased.
5. With your IMPULSE slightly detuned, sweep the
search coil over the target again. You’ll notice
that the target area has shrunk.
6. Continue to detune your IMPULSE until only a
slight signal is heard when the coil is passed over
the target.
7. With the IMPULSE set to this minimum-tune
mode, only the center of the coil, or hot spot, will
respond to the target, pinpointing the target
location.
8. Another way to pinpoint large and/or shallow
targets is to simply lift the search coil until only a
faint, narrow target response is heard.
9. After digging the target, retune your IMPULSE
before continuing.
Hot Spot
Search coil penetration
with minimized tuning
Search coil penetration
with readjusted tuning
Search coil penetration
with maximized tuning
Pinpointing with the
IMPULSE no-motion
detector is
accomplished by
adjusting the tuning
so that only the
center of the search
coil remains
sensetive to the
target.
PINPOINTING
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