Fisher 1225-X manual Discrimination Points

DISCRIMINATION POINTS

By adjusting the DISC (“Discrimination”) control, you will be able to ignore or (“reject”) small pieces of metallic target trash and ground minerals while detecting valuable targets. The lowest setting at which an object is rejected is reffered 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 1225-X on by turning the DISC control to zero.

3.Set the SENS control to 8.

4.Hold the search coil in the air, away from any metal objects and check the batteries as explained in the Control Function section (sensitivity control).

5.Hold the search coil in the air 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 1225-X is a motion detector in the DISC mode and responds only when the search coil (or the target) is moving.

6.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 1225-X will reject some targets and continue to respond to 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 at 7.

7.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 1225-X will instead respond with a broken signal which will usually disappear if the search coil is raised slightly. The strong signal of a good target will usually get weaker when the coil is raised.

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