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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.
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01.02&03
01.02&03
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SIGNAL
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SIGNAL
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NORMAL, 01
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02
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rNORMAL
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SIGNAL
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NORMAL
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SIGNAL
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NORMAL
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SIGNAL
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PULL TABS
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. NORMAL & D1
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SIGNAL
FERROUS
FOIL
CUPRO-NICKEL COIN
GOLD RING
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NORMAL
GOLD, SILVER OR COPPER COIN
~====~
BATTERY CHECK
The battery check button is on the end of the control box,
to the right of the headphones socket. To check the
batteries, press this button with the detector switched on.
(I t doesn't matter what the control settings are).
With new batteries the meter pointer goes nearly to the
right hand end of the scale. As the batteries run down it
goes less far. When it fails to reach the red line it is time to
change both batteries. (To gain access to the batteries
insert a coin in the slot of the 'screw head' between and
below the headphones socket and battery check button.
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. Once the ground has been 'eliminated' in this
way you will find that there is no change of sound as the
head is lowered towards the ground or raised from the
ground. The only thing that affects the sound is buried
objects capable of conducting electricity. In general this
means metal of any kind - copper, iron, aluminium, silver,
gold
.
The one disadvantage of the normal mode is that it does
not discriminate between metals - though it does perform
the useful job of discriminating against the particles of iron
ore which permeate some soils and can cause false
indications with some detectors. Such 'mineralised' soil
can be 'tuned out' in the normal mode just like ordinary
soils. Learning to 'tune out' the ground is excellent practice
in preparation for getti ng to work on the D modes. D modes
are used for object discrimination.
Here the detector reacts according to the nature of the
target object. It..GlrUJe..set to go silent when the. obje.£t is
a tinplate bottle cap, a piece of silver paper, a cigarette
packet, an iron article, a ring-pull, but will sti II sound out
when the object is a coin. The price paid for this is that
the detector now becomes sensitive to the ground. It will
sound off if the head is not kept at the correct height
above the surface, or go silent and less sensitive. Also as
more and more d iscri mination is used the detector becomes
blind to some types of wanted object such as 5p cupro
nickel pieces. This is where the need for experience enters.
The user must get to know just how much discrimination
to employ on any particular site. The actual operation of
the VLF 1000 on 'discriminate' is easy it's the ability to
assess how to use it that calls for skill
No matter what the site conditions, the VLF 1000 is made
easy to operate by the provision of an auto-tune button.
This is in the end of the handle and if the detector should
drift off tune or be affected by changes in the ground the
correct tuning is instantly and automatically restored by
pressing the button.
DETECTION RANGE
Detection ranges will vary, depending on the length of time
an object has been buried, and in what sort of ground.
Generally speaking, the best results will be obtained in well
compacted, fairly dry soils and when the object has been
buried for a year ot two. During this length of time, the
metal is able to interact with the salts in the ground, and
becomes more easily detectable. Under these conditions,
detection ranges wi II be, at thei r max imum 13" on a
Victorian penny, and 6' on a large object such as a metal
chest. The worst conditions for detecting are on loosely
compacted or freshly dug ground, or when the object has
only recently been buried. In these conditions, detection
ranges will be reduced.
4
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