User manual C-SCOPE VLF 1000

[. . . ] , -. =~©®fP~ VLF 1000 DISCRIMINATOR OPERATING INSTRUCTIONS INTRODUCTION The C-Scope VLF 1000 is the most electronically advanced detector available and is the result of six years continued research and development by Britain's leading detector manufacturer. It operates on a very low frequency and incorporates a quartz crystal drive to ensure accurate performance in both normal and discriminate modes. The detector is designed to give the operator the greatest flexibility possible. It will exclude ground effects in its normal mode or alternatively be tuned to take advantage of wide range discrimination facility which can be varied from ignoring small pieces of iron to rejecting pull-tabs. [. . . ] In such cases the normal mode cannot cope, but you can still get ground elimination by turning the function switch to D1 and repeating the (]round elimination procedure but this time using the reject control instead of the ground control which is now inoperative. If you immerse the search head in salt water even D 1 cannot cope. Vou must then use D2 (setting up as before) and put up with a certain amount of ground effect. See below under "Discrimination" for how to use the detector in these circumstances. DISCRIMINATION IN THE FIELD If the site is relatively jun k free, the detector can be used in the Normal mode with the detector adjusted for 'ground elimination'. When an object has been located then the detection mode can be reset by depressing the push button and changing modes to D 1. The mode can then be reset as before to D2 and then rescanned, and also to D3. By using this mode the target object can be analysed. The drawback to this method is that sensitivity to cupro-nickel coins is less on D2, or on D3 than on Normal or D1, so a ten pence coin could be ignored on D2 or D3 although it could be detected on Normal or D1. The golden rule here is dig the object unless there is a clear rejection of the target object, i. e. , a negative meter swing or decrease in volume. Used correctly this metAod will give the most comprehensive analysis of the nature of the target object. It is extremely lIseful to bury a range of objects such as an iron nail, a piece of silver paper, a pull-tab, a copper coin, a silver coin, and a cupro-nickel fifty pence piece, and familiarise yourself with the reactions in the various modes. If iron is a problem on a site and the Normal mode is giving too many signals to be analysed, the detector can be used on D1 as the main operational mode, and when an object is located, the modes changed to D2 and D3 in turn and the target object rescanned. If silver paper or pull-tabs are problems, and the Normal mode is giving too many signals to be analysed, the detector should still be operated on D1 as the main operational mode, and as previously when an object is located, the modes changed to D2 and D3 in turn. DISCRIMINATION (D1, D2, D3 on the Function Switch) The VLF 1000 rejects unwanted objects by a reduction in volume as the head passes over them. Various amounts of rejection can be selected by the Function switch. The reject control provides fine adjustment. The ground control is inoperative when the Function switch is set to one of the D positions. As usual, the auto-tune button should be kept pressed when setting up the detector for discrimination. Begin with these settings: - Reject to 5 - Sensitivity to Max -TunetoO - Volume to off. 3 N. B. D3 should only be relied on or used on particular beaches in exceptional circumstances where pull-tabs occur every few feet. Many experienced users will choose the most suitable mode for a site, which will either by Normal or D1 and dig all positive signals that occur in the mode chosen. Below are pictorial illustrations of the reactions of the VLF 1000 in the various modes to different target objects. These are of course generalised for simplicity and it is essential that these instructions are read in full to appreciate the detector's reaction to the individual types of coins or metals. Turn it anti-clockwise through one right angle, making the slot vertical. [. . . ] . 1, , '. . ' £ I ~. _~ ~ ·( . I '. . . ~ :J DIAGRAM 4 I ~ _ . ' __ , J" ~ . -:e;--:- - i ~-- . - . e:- . " It is essential that the search head is kept close and parallel to the grounrf to avoid missing finds as in A, C, and D 5 CARE AND MAINTENANCE The working life of your detector will be shortened by careless use or neglect of the unit. Think of your C-Scope as a scientific instrument - NOT A TOY. [. . . ]