Velleman C.Scope CS990 Operating Manual

CS990

Professional metal detector

Operating manual

Gebruikers handleiding

Manuel de l’Utilisation

CS-990 OPERATING INSTRUCTIONS
INTRODUCTION

These metal detectors are recognised as the finest detectors available. They are designed with lasting
quality, high technology input, and above all, value for money in mind.

The only way to realise this value and quality is to carefully study and understand this instruction
manual. You will then be able to make use of all of the advantages designed into your detector. It is
also strongly recommended that you experiment with the detector’s operations indoors in air, with
various test samples, in order to learn to identify and understand the detector’s capabilities and
responses. It is best to lay the detector on a table with the search head off the end and to pass test
objects across the search head to best stimulate actual responses.

FEATURES

Before proceeding to the controls and the operating procedure it is important to understand the
principles of operation of the CS-990.

The CS-990’s principle features are :

Audio Ground Exclusion : Elimination of ground effect.
Meter Discrimination : Rejection of iron and small pieces of silver paper via

the signal meter.

Meter and Sound Discrimination : Rejection of iron and small pieces of silver paper via

the signal meter and loudspeaker and/or headphones.

GROUND EXCLUSION

What is ground exclusion ?

On some sites mineralisation caused by iron deposits or iron oxides or wet salt sand makes it
difficult to operate a detector successfully. The effect of these minerals is termed "GROUND
EFFECT". In practice, the signal of the detector alters if the search head is not kept exactly steady
during sweeping or the gap between the search head and ground varies. If the tuning level increases
upwards, as on inland sites when the detector head is inadvertently raised, the signal may be
confused with a target signal.

The CS-990 offers two modes of ground exclusion :

- A preset ground exclude setting for use on mineralised inland sites, G I.

- A variable ground exclude setting for use on wet salt sand beaches, or for total iron
rejection on non-mineralised inland sites, G II.

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Inland Mineralised Sites :

The G 1 mode is the mode in which "Ground Exclusion" is achieved on the majority of inland sites.

Beach and Non-Mineralised Inland Sites :

The G 2 mode enables the detector user to ground exclude on wet salt sand beaches by using the
variable ground exclude control knob identified as "LEVEL", positioned directly above the ground
exclude control knob G 1 & G 1. The G 2 mode also enables the operator to use the detector for
total iron rejection on non-mineralised inland sites.

DISCRIMINATION (Rejection)

What is discrimination ?

It is an obvious advantage when metal detecting to get different signals for worthwhile as opposed
to worthless objects, and therefore be able to discriminate or differentiate in various ways. Basically
a rejected item will cause the signal to fall. The meter needle will drop to the left, and the sound
level will die away and/or decrease in frequency. On the other hand, a good target object will cause
the signal to rise. The meter needle will move to the right and the sound level and frequency will
increase.

The full discrimination facilities of this detector will be described in more detail under the heading
"OPERATING THE DETECTOR IN THE FIELD".

If an object is very close to the search head, conflicting signals may occur. These signals are
characterised by hard swings of the meter needle from left to right. If you encounter such problems
you should raise the search head a few inches (10 cm), retune and rescan. You should now receive a
clear signal.

These anomaly signals are caused by the object overloading the signal. Normally iron fragments or
wire on the surface cause this phenomenon.

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Diagram 1

A ON/OFF Tune Control
B SIMDISC Control
C GROUND EXCLUDE Control
D LEVEL Control
E AUTO-TUNE Button
F METER
G BATTERY CHECK Button
H BATTERY COMPARTMENT
I UPPER STEM
J MIDDLE STEM
K LOWER STEM
L SEARCH HEAD

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