White’s Electronics Classic 5 ID - Manual (Page 15)

Classic® 5 ID
15
Advanced Operator
Ground Rejection
The ground rejection of the Classic® models is factory
preset at a level slightly positive of a ferrite mineral
sample. This setting will provide good performance in
most ground conditions.
If you notice a lot of false targeting (beeps where there
are no metal items) or if ground penetration is less
than several inches, the ground rejection may need to
be adjusted for your area.
Some areas will not allow good ground rejection, such
as wet salt water beaches or black sand. In these areas,
it is advisable to leave the ground rejection alone and
work the detector with the NORM/BLACK SAND
toggle in the BLACK SAND position, using the G.E.B./
DISC toggle in the center G.E.B./DISC position, and a
low DISC knob setting (RING RANGE or below).
To reset the ground rejection:
I. Place the G.E.B./DISC toggle in the center G.E.B./
DISC position and abruptly lower and lift the loop
from the ground. A beep indicates ground rejection is
not set perfectly.
II. Under the “Made In America” decal on top of the
instrument, there is an access hole with a trimmer
inside.
III. Use a very small regular head screwdriver to very
slightly adjust this trimmer.
A. Find the edge where in one direction the detector
beeps as the loop is abruptly lowered and lifted
from the ground and in the other direction the detector
doesn’t beep as the loop is abruptly lowered to
and lifted from the ground.
B. The correct setting is the point or edge where the
detector just stops beeping as the loop is abruptly
lowered to and lifted from the ground. Going further
into the silent area in most cases hinders performance.
C. Recover the access hole with the decal or a small
section of black electrical tape to prevent moisture
and dirt from entering the control box.
Discrimination:
The DISC (discrimination) control can be further
labeled with information that will aid in determining if
a metal is trash such as a pulltab, or good such as
jewelry. Use the center G.E.B./DISC toggle position.
I. Obtain a USA nickel, and an ordinary (common)
aluminum pulltab with tail.
II. Bury the nickel about an inch deep in the ground.
A. Sweep the loop over the nickel while adjusting the
DISC control. Note that if the DISC control is turned too
high the nickel is rejected.
1. Find the furthest clockwise DISC setting that still
detects the nickel well, and mark this position on the
control.
III. Now do the same thing with the pulltab. Bury it an
inch in the ground.
A. Sweep the loop over the pulltab while adjusting the
DISC control, note the point the pulltab is rejected.
1. This time, mark the furthest counterclockwise
position that rejects the pulltab.
IV. If completed correctly, you should now have two
marks on your DISC control.
A. Furthest point (clockwise) a nickel is accepted.
B. Furthest point (counterclockwise) a pulltab is
rejected.
C. Note that if the marks for nickel and pulltab are very
close together, the pulltab is probably not
ordinary. Try a different, more common pulltab.
V. You’re now ready to search.
A. Use the DISC position you marked for accepting a
nickel.
B. Once a consistent, smooth, solid beep is found
continue sweeping the loop over the target while
slowly turning the DISC control clockwise.
1. If the target starts rejecting prior to the pulltab
mark, it is likely a nickel or jewelry.
2. If the target is rejected at the pulltab mark, it is
likely a pulltab.
3. If the target is not rejected until well after the
pulltab mark, it is either large jewelry, large
aluminum foil, or an aluminum screw cap.
4. If the target is not rejected all the way to the fully
clockwise DISC position, it is likely a coin other than a
nickel.