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. [. . . ] 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. 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. 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. The 'screw' - actually a stud - can now be pulled out, allowing the control box to be opened to reveal the batteries, which are held in place by spring clips. Make sure the detector is switched off at the volume control before replacing batteries. The snap connectors should be removed from the ends of the batteries before tak ing the batteries out. Note that there is a 'right way round' for the snap connector; it will not stay put if applied the wrong way. It does not matter which connector goes to which battery so long as it is connected correctly). OPERATING NOTES In the normal mode ordinary soil has very little effect. Indeed, it can be made to have no effect at all, by means of one simple adjustment which you will quckly learn to carry out. [. . . ] Time spent researching to locate a worthwhile site for a search can be time wasted if your search is hasty and eratic. To achieve maximum results, it is important, then, to decide on your approach to each particular site, in advance of the actual search. Tactics will be decided by the type of site - it is more profitable to scan a small area thoroughly, than to conduct a haphazard search of the total site However, when the site is too far away for you to make several return visits, a plan should be adopted which gives maximum site coverage, at the same time as indicating the most likely areas for detai led search. One method is to divide the area into large squares by use of a 'criss-cross' search pattern. [. . . ]