User manual C-SCOPE CS1220

[. . . ] Set SENSITIVITY to mid position (12 o'clock). With the search head 1-2 cm from the ground, press and hold the RETUNE button (lower mid) and adjust the TUNE control until a tone is just heard. If the tone drifts from the threshold position press the RETUNE button to reset the level. The other modes require more detailed explanation found in the following pages. [. . . ] For a low to mid range of Discrimination GD1 is selected, and for mid to high range of Discrimination GD2 is selected. See page 8 for an explanation of the low and high range. This is a useful coincidence because it means that Ground Exclusion and Discrimination against iron are possible at the same setting on wet sand with the CS1220. The Ground Exclude setting for beaches will vary significantly and in practice it is possible to reject silver paper and ground exclude on a severe beach. GD1 is the recommended mode setting and Discriminate level can be adjusted to suit the particular conditions. It is essential when operating on a beach that the Search head is kept at a constant height above the surface. It may also be necessary to reduce the SENSITIVITY further because of variation in the salt content over the area searched. Keep it at a steady height above the ground and ensure the Tuning Level is set correctly by operating the RETUNE button on the Meter Console and then release it. If however, the detector is being operated in the Discriminate Mode on an inland site, it will be necessary to balance the sensitivity level to reduce the ground effect. In practice this means setting it to the highest level possible, which of course will depend on the degree of mineralisation, and how capable the operator is at keeping the search head level with the ground. A sacrifice in sensitivity level will drastically reduce the ground effect, but will not reduce the depth penetration to the same degree. You will note that the volume will increase quickly as the metal object passes across the search head, with the loudest sound occurring when the search head is immediately centred over the metal object. As the object passes beyond the search head the sound will quickly fade. Since the detectors employ a Total response search head, the object can be detected across the full width, back to front, of the search head. Maximum sensitivity is down the middle of the search head. Pinpointing (i) The strongest signal will always be received when the object is directly beneath the centre of the head (see X in the diagram below). To pinpoint the find, stop the search head when you are directly over the target object, then move the search head through 900 and sweep again, thus forming a cross with the two sweeps as show in the diagram. 14 (ii) To `focus' the target signal still further raise the search head, retuning if necessary, and pass the search head over the object until only a faint signal is heard. The faint signal will then be occurring at a point X under the centre of the head (see diagram). More accurate pinpointing, particularly of deep buried objects can be achieved by finding the centre of the target object as described above and fixing its position in the `minds eye'. Turning your detector through 900 and sweeping across the target again will give a second reading, accurately determining the centre of the object. Digging carefully at point X will reveal the find. With little practice, size shape and depth of an article may be estimated in this way before digging. ACCESSORIES (OPTIONAL) Available from C-Scope. Headphones: Headphones not only extend battery life but improve sensitivity by cutting extraneous noise. [. . . ] Remember it is illegal for anyone to use a metal detector on a scheduled ancient monument unless permission has been obtained from the Historic Buildings and Ancient Monument Commission for England or the Secretary of State for the Environment in Scotland and Wales. Remember that when you are out with your metal detector, you are an ambassador for our hobby. Do nothing that may give it a bad name. CARE OF YOUR DETECTOR Storage When not in use your detector should be stored in a dry warm environment. If it is not to be used for a certain length of time it is advisable to remove the batteries to avoid leakage which could cause serious damage. [. . . ]