- Fisher Research Laboratory Metal Detector User Manual

DISCRIMINATION POINTS

are rejected, however other objects may “snap,

crackle and pop” as they are rejected. This is a

perfectly 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.