19
audio response will give them some ideas as to the
depth and/or size of the target. Recommended
starting point: VOLUME = “5,” then adjust the volume
control for comfort over loud targets.
5. Once the controls are properly set, begin searching
by walking slowly and sweeping the search coil in a
tight semicircle as shown in Figure 9.
6. Keep the coil parallel to the ground and as close to
the ground as practical. This is extremely important
for maximum coverage and depth. If you’re searching
on a lawn, you may set the coil right on the grass and
lightly “scrub” it.
7. Overlap your sweeps by at least 50 percent.
Remember, your coil’s search pattern is conical, and
if you don’t overlap each sweep you’ll miss the deeper
targets.
8. Search in a methodical manner. Pay close attention
to where you’re going and where you’ve been.
9. Keep the search coil moving at a comfortable rate.
Remember that the CZ-20 is a motion detector and
responds only when the coil or target are moving
(except in the Pinpoint mode.)
10. Take your time. If you walk too fast you can’t overlap
your sweeps and you’ll miss a lot of ground. If you
swing your coil too fast you’ll lose some sensitivity to
deep and/or small targets.
11. Figure 12 on page 20 shows how the CZ-20 search
coil pattern is affected by sweep speed, ground
mineralization and search mode.
SEARCHING ON LAND OR SHALLOW WATER
Figure 9. When the stem length is
properly adjusted, the CZ-20 is
balanced for sweeping a tight
semicircle around the operator: wide
to the right for right handers, wide to
the left for left handers. Be sure to
overlap your sweeps.
22
PINPOINTING
Target location is quick and easy using the pushbutton pinpoint
mode. The coil does not have to be moving to get a response in
this mode.
1. Whether in Autotune or Target I.D. mode, once the
presence of a target is indicated by the “beep-
beep” of your CZ-20, simply move the coil away
from the target area, and with the coil lightly on
the ground or very close to it, press and hold the
PINPOINT button.
2. As you bring the coil back into the target area, still
pressing the PINPOINT button, the audio volume
and pitch will increase.
3. When the pitch and volume are at their highest
points, stop the coil and move it forward and
backward a couple of times, again stopping over
the strongest response.
4. Repeat one more time, side to side and front to
back, keeping the PINPOINT button pushed in,
stopping over the spot where you get the maximum
volume and pitch.
NOTE: Large or shallow targets can give a wide signal when the
pinpoint button is pushed. This can make pinpointing difficult.
To pinpoint these large or shallow targets, find the edge of the
wide signal with the pinpoint button pushed. While over the edge
of the signal, release the pinpoint button and re-push it. This
automatically decreases the sensitivity and narrows the width
of the pinpoint signal. By repeating this procedure a few times
over the edge of the wide signal, you can narrow the pinpoint
signal and pinpoint your target.
Target I.D. Mode and Autotune Mode
Pinpointing in either of the search modes is difficult and
requires practice. For this reason many CZ-20 operators don’t
use the pinpoint mode.
In Target I.D. or Autotune, simply use the same basic
procedure for the pinpoint mode, moving the coil side to side
and front to back over the target area, stopping over the
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