Pinpointing - Fisher m-SCOPE 1212-X Operating Manual

PINPOINTING

Pinpointing takes practice. The more time you spend with your
1212-X the faster and more accurate you'll become.
1. Once a buried target is indicated by the tell-tale
"beep" of the 1212-X, continue moving the search
coil from side-to-side across the target in a narrower
and narrower search pattern.
2. When you have narrowed your search pattern
as much as you can, and still hear the target, stop
the search coil.
3. Now, move the coil slowly forward and then
straight back to- wards you a couple of times. Stop
the coil over the area where you get the loudest
response.
4. Move the coil slowly side-to-side one more time,
zeroing in on the loudest target response.
5. Stop the coil over the area of loudest response
and rest it on the ground.
6. Your target should be below the "Hot Spot" of
the search coil which is marked by a bull's- eye,
slightly below the center of the coil.
7. Slowly move the coil aside, keeping your eyes
on the spot where the "Hot Spot" was and
quickly mark the target location with your finger
or digging tool.
8. For very strong signals, you may improve your
pinpointing accu- racy by adding one or more of
the following steps:
a. Lift the coil until the signal is just barely heard.
b. Increase the discrimination level.
c. Rest the coil on the ground and move it back
and forth very slowly.
9. For very weak signals try the following:
a. Move the coil closer to the ground.
b. Decrease the discimination level.
c. Speed up the sweep rate slightly.
10. The diagram above shows the search coil
detection pattern and how it is affected by
various sweep speeds, trash rejection and
ground mineralization levels.
9