Nobody understands metal detecting like C.Scope. We’ve been making top performing, world beating metal detectors in Britain for more than 25 years.

We know all about the ground conditions in this part of the world and we know the sort of targets our customers want to find. This vast fund of accumulated knowledge has enabled us to design best selling machines like the CS1220, CS2MX, Newforce R1 and now our latest professional unit specially for the beginner - the CS990XD.

The CS990XD is a unique combination of user-friendly features - some often found on detectors costing twice the price.

The amazing discrimination facility is going to save you a lot of time digging up rubbish.

C.Scope’s powerful yet easy to use ground exclusion system gets right down to deep targets - even in difficult ground conditions.

The CS990XD is the very best start on the road to successful treasure hunting.

HOW IT WORKS
Inside the 990XD are two separate detectors operating simultaneously. An ‘inland’ detector which is factory set to ignore mineralised inland ground and gives a positive response to all metals, and a ‘beach/disc’ detector operating at the (adjustable) wet salt sand exclude level, which gives a negative response to iron. By using the switches on the front of the 990XD to combine the signals from the above two detectors, it is possible for the operator to detect all targets whilst eliminating the effects of the ground while distinguishing between good and reject targets. Detection is indicated by the loudspeaker sounding off (located in the rear of the battery compartment), and by the meter needle moving.

ON/OFF SWITCH AND TUNE CONTROL
This control is a combined on/off switch and rotary tune control. Fully anticlockwise to the clicked position is power off. To turn the detector ‘on’ rotate the control clockwise from its indented ‘off position. To ‘tune’ the detector, adjust the control to give the preferred level of audio (from the internal loudspeaker or headphones). For best performance the audio should be adjusted to threshold when the sound is just beginning to break through, since this is when the ear is most sensitive to small changes, and it is important to maintain this threshold when searching to achieve maximum depth. The meter gives a visual indication of the audio level (unless battery check or meter disc is selected) and will read midscale when tuned at threshold. The tune control is used in conjunction with the retune button which should be depressed when making adjustments.

RETUNE PUSH BUTTON
Should the audio level change during searching other than that resulting from a target, such as from drift occurring from warming up (see paragraph ‘search head), press (and release) the ‘retune’ button to recover the threshold sound as set on the tune control. The ‘retune’ button should also be held down when making adjustments to any of the detector’s controls.

GROUND EXCLUSION SWITCH and DISC MODE SWITCH
Firstly what is ground exclusion? On some sites mineralisation caused by iron makes it difficult to operate a detector successfully. The effect of these minerals is termed ‘ground effect.’ In practice, if the detector is not correctly adjusted, the signal alters if the search head is not swept at a constant height above the ground. However by operating the detector at the correct ‘exclude’ point this ground signal can be eliminated. The elimination of this signal is known as ground exclusion. When operated at the inland ground exclude point, all metals give a positive response which is sometimes called ‘all metal’ mode. What is discrimination (disc)? Like mineralised ground, metals and wet salt sand too, have a characteristic exclude point. By operating the detector at the beach exclude point, iron and small ferrous items produce a negative response, but valuable targets still produce a positive signal. By operating at a higher exclude point still, small pieces of silver (aluminium) paper will also produce a negative (reject) signal.

LEVEL control
The discrimination level of the ‘beach/disc’ detector in the 990XD is centred at about that of wet salt sand but can be varied from iron reject through to aluminium foil reject by adjusting the ‘level’ control. (The ‘level’ control also adjusts the exclude point of ‘meter disc’ and ‘meter and audio disc’).

INLAND and DISC MODE SWITCH
With ‘inland’ selected the 990XD operates at a fixed level of ground exclusion. This inland ground exclude point is factory set on the 990XD. All metal targets will produce an increase in audio volume in this mode regardless of the ‘level’ control setting. The ‘beach/disc’ detector remains operating and can be selected to drive the meter or control the audio pitch by selection on the ‘disc mode switch’. The level of discrimination of the beach/disc detector can be adjusted by the ‘level’ control.

The ‘inland’ mode is used on mineralised inland sites and can be used in conjunction with any one of the disc modes described below. By selecting ‘meter disc’ mode the meter needle moves to the right for good targets and to the left for reject targets. By selecting ‘meter + audio disc’ mode the meter moves to the right for good targets and to the left for reject targets, and the audio pitch increases for good targets and decreases for reject targets. By selecting ‘none’ the meter needle moves to the right for all targets and the pitch remains constant.

BEACH and DISC MODE SWITCH and LEVEL control
Due to the varying nature of beach soils (the salinity and wetness) the 990XD is equipped with an adjustable level of ground exclude in ‘beach’ mode. It is the mode best suited to beach detecting where fine adjustment of the ‘level’ control is required to exclude wet sand. By selecting ‘meter disc’ mode the meter needle moves to the right for good targets and to the left for reject targets. By selecting ‘none’ the meter needle moves to the right for good targets and to the left for reject targets (same as meter disc since it is in beach mode). Selecting ‘meter + audio disc’ gives a pitch increase to good targets, reject targets are ignored. The inland detector plays no part when ‘beach’ mode is selected and is switched off. Only use this beach mode on the beach or at inland sites where there is no mineralisation and where you do not wish the detector to sound off over iron. It should be apparent from the above that the ‘level’ control acts primarily as ground exclude control in ‘beach’ mode, and secondly varies the discrimination point when operating in ‘meter disc’ or ‘meter and audio disc’ mode.