Useful Tips; Detection Range - Velleman CS130 Bedienungsanleitung

11.

Useful tips

 No detector is 100 percent accurate. Various conditions influence metal detection. The detector's reaction
depends on a number of things:

the angle at which the object rests in the ground.

the depth of the object.

the amount of iron in the object.

the size of the object
Search coil sweeping hints
 Never sweep the search coil as if it were a pendulum. Raising the search coil while sweeping or at the end
of a sweep will cause false readings.
 Sweep slowly. Hurrying will cause you to miss targets.
 It is better to sweep the search coil from side to side in a straight line and keep the search coil parallel with
the ground.
Pinpointing a target
 Accurately pinpointing a target makes digging it up easier. Accurate pinpointing takes practice, and we
suggest you practice finding and digging up small metal objects on your own property before you search
other locations.
 Sometimes, targets are difficult to accurately locate due to the sweep direction. Try changing your sweep
direction to pinpoint a target.
 Follow these steps to pinpoint a target.

When the detector detects a buried target, continue sweeping the search coil
over the target in a narrowing side-to-side motion.

Make a visual note of the exact spot on the ground where the detector beeps.

Stop the search coil directly over this spot on the ground. Then move the
search coil straight forward away from you and straight back toward you a
couple of times.

Make a visual note of the exact spot on the ground where the detector beeps.

Repeat Steps 1-3 at a right-angle to the original search line, making an "X"
pattern. The target will be directly below the "X" at the point of the loudest
response.
Notes:
 If trash in an area is so heavy that you get false signals, slow your sweep and use shorter sweeps.
 Recently buried coins might not respond the same as coins buried for a long period of time because of
oxidation.
 Some nails, nuts, bolts, and other iron objects (such as old bottle caps) oxidise and create a "halo" effect. A
halo effect is caused by a mixture of natural elements in the ground and the oxidation created by different
metals. Because of the metal mixtures, target signals might not be in a "fixed" position. This effect makes
these objects very hard to detect accurately.

Detection range

 The detection range will vary depending on the size of the object, the length of time an object has been
buried and the type of ground the object is buried in. The best soil is compact soil, where you can locate
coins at great depth, especially if they have interacted with the salts in the ground, which makes them
appear larger to the detector. The worst conditions for detecting are in loose soil or freshly dug ground or
when the object has only recently been buried. Ninety percent of all objects are found within 6" of the
surface. Adverse soil conditions can reduce the detection range by as much as 50%.
Determining the target size and depth
 An operator who is familiar with his instrument will be able to do an excellent job of determining object
size, shape and depth before he digs. He does this through careful analysis of the audio signals coming
from the detector. You should always listen for the specific characteristics of a signal. Determine over how
large an area the contact generates a signal to try and "outline" the object before you dig. Listen for the
sharpness or dullness of the signal and determine the strength of the signal. A coin generates a sharp
signal, while the signal for a nail is vague.
Batteries
 Always carry a spare set of batteries when going out on a fieldtrip.
 Using headphones will increase batteries life-time.
V. 03 – 08/09/2017
CS130
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