Fisher M-Scope 1280-X Aquanaut Operating Manual page 9

OPERATING TIPS
1. Keep the search coil cable wound snugly around
the stem when diving around coral or jagged rocks
to keep it from snagging.
2. Divers should make sure the drain holes in the
headset are unobstructed. Better yet, wait until
you're on the bottom before putting them on and
take them off before surfacing.
3. Divers should also keep the search coil at least
two feet away from their body. Metal gear (weights,
gauges, tanks, etc.) will be detected by the 1280-X
if held too close.
4. Practice pinpointing. There's nothing sacred
about the method described in this manual. Many
1280-X users have developed their own pinpointing
methods.
5. False signals may be caused by rapidly moving
surf, highly mineralized or trashy ground, large or
irregular shaped trash and bumping or raising the
search coil very fast. A false signal will generally
sound suspicious to the experienced treasure hunter.
It may be very faint, or very sharp and abrupt with
static. Often when you go back over the same spot
a false signal will simply disappear. You may reduce
the number of false signals you get by increasing the
discrimination level and/or reducing the sensitivity
level.
6. If you're wading or hunting on land, hold your
digging tool behind your back or above your waist.
Your 1280-X is sensitive enough to sound off each
time you sweep your coil beneath it.
7. There is some sensitivity loss at the higher levels of
trash rejection. The greater the ground mineralization,
the higher the sensitivity loss. For example, you may
be able to detect a penny 6 inches deep at zero
discrimination, but you may be able to detect it no
deeper than 5 inches at the pull tab discrimination
point.
8. Some objects such as shallow bottle caps, bent
pull tabs or trash less than 2 inches from the coil
may be difficult to reject. The 1280-X will instead
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1280Xmanual-870246.indd 9
DISCRIMINATION POINTS
normal response indicating that the powerful
discrimination circuitry is doing its job.
9. Large pieces of trash such as beer cans or jar lids
may sound like good targets no matter what you
do. With a little practice, however, you will be able
to tell the difference between a large target and a
small coin sized object.
10. The diagram below shows some of the different
target responses you may expect at different levels
of discrimination. Note that as you increase the
discrimination level, you progressively eliminate more
targets including some good ones, such as nickels
and gold rings.
* At the maximum sensitivity level of 10, you may hear some static or "circuit
noise". As a general rule, hold the search coil in the air and set the sensitivity
at 10. If the circuit noise is annoying, reduce the sensitivity to 8 or 9.
Figure 5. Typical 1280-X audio responses over 1 inch deep targets with
search coil sweeping 1 to 2 inches above ground.
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6/20/06 3:29:29 PM