DISCRIMINATION POINTS
By adjusting the DISCRIMINATION Control, you will be able to ignore (or “reject”) small pieces of metallic trash and ground minerals while detecting valuable targets. The lowest setting at which an object is rejected is referred to as its “discrimination point.” Discrimination points are determined by such factors as size, shape, depth, type of metal and ground mineralization.
1. Scatter some sample targets, such as coins, pull tabs and small | |
pieces of foil on the ground 1 to 2 feet apart. | |
2. | Turn the |
to 5. | |
3. | Set the SENSITIVITY Control to 8. |
4. | Set the FREQUENCY Control to 0. |
5. | Set the DISC control to the IRON present position. |
6. Hold the search coil in the air, away from any metal objects, and | |
check the batteries as explained in the Control Functions section. | |
(See SENSITIVITY, p. 9.) | |
7. Hold the search coil about 2 inches above and parallel to the | |
ground. Move it slowly over the samples and note the sharp, loud | |
response as you pass over each one. Keep in mind that the 1236- | |
X2 is a motion detector in the DISC mode and responds only when |
PINPOINTING IN MOTION SEARCH MODE
Pinpointing in the Search Mode will take a little practice, but you may find that for most targets it’s even quicker than the
1.For very strong signals, you may improve your motion mode pinpointing accuracy by adding one or more of the following steps:
a. Lift the coil until the signal is just barely heard. b. Reduce the sensitivity level.
c. Increase the discrimination level.
d. Rest the coil on the ground and move it back and forth very slowly.
2.For very weak signals try the following:
a. Move the coil closer to the ground.
b. Increase the sensitivity level.
c. Decrease the discrimination level.
d. Speed up the sweep rate slightly.
the search coil (or the target) is moving. |
7. Increase the DISC control to a setting of 3 and again pass over |
the targets. Repeat this process at settings of 4, 5, 6 and so on to |
10. You will note that as you increase the level of discrimination, |
the |
others. You have now determined the discrimination points for the |
rejected objects. For example, the small nail discrimination point |
may be at 3 and the pull tab discrimination point at 7. |
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 |
usually disappear if the search coil is raised slightly. (whereas, the |
1
2
3 4
Figure 9. Search coil detection pattern
1.Minimum Depth
a.Very slow or very fast sweep speed.
b.Discrimination set at 10.
2.Good Depth
a.Moderate sweep speed.
b.Discrimination set at 5.
3.Maximum Depth
a.Moderate sweep speed.
b.Discrimination set at 10.
4.Missed target
strong signal of a good target will usually get weaker when the |
search coil is raised.) |
12
NOTE:
Many targets within the range of your
17
1236x2 | 6/9/06 10:08:59 AM |