RIDGID metal detector User Manual download pdf (Page 2)

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Metal Detectors

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small pieces of iron. The further up the scale the

control is set, the more objects will be rejected.

On a high setting only the most conductive

objects will be found. It should be noted that if

the control is set too high, then modern coinage

and other desirable objects will be rejected.

3. Retune Pushbutton

This is held down when tuning the detector to

THRESHOLD. It is also pressed and released to

retune to THRESHOLD if the detector drifts out

of tune.

4. Headphone Socket

The headphone socket accepts a standard ¼"

stereo jack plug. Plugging in stereo headphones

automatically disconnects the loudspeaker.

Headphones will give slightly more sensitivity as

they cut out external noises which can interfere

with your ability to detect objects.

Using Your Detector

1. Set the discrimination control to the desired

level (to begin with it is probably advisable to set

this at '0' until you have become more familiar

with the controls).

2. While holding the detector, position the

search head approximately 5cm (2") from the

ground and parallel to it, making sure that the

search head is kept away from any metal.

3. Keeping the RETUNE pushbutton pressed,

turn the tuning control clockwise until a faint

sound is heard (Maximum sensitivity on any

metal detector of this type is achieved when the

sound is just audible). This point is known as

THRESHOLD. Release the RETUNE pushbutton

and the detector is tuned.

4. With your detector now correctly tuned, you

will notice that lowering the search head to the

ground makes the faint sound from the speaker

fade away. Similarly, raising the search head

causes the sound to increase. This is a normal

reaction to the ground and does not necessarily

indicate the presence of lack of buried objects

(See GROUND EFFECT).

5. By maintaining a constant distance between

the search head and the ground, commence by

slowly walking forward, scanning the ground in

an arc. A slow scanning speed is best, as this

helps to hear the weak signals produced by

deeper buried objects.

6. On hearing a sharp note, this is an indication

that a small metallic object is present. A long

note is an indication of a larger object. Strength

of note is also dependent on the depth of the

target object.

If you wish to alter the position of the

DISCRIMINATION control, simply press the

RETUNE pushbutton and at the same time alter

the control to the desired number, then release

the pushbutton.

When DISCRIMINATION is used, you may hear

a sharp, quick signal if the search head touches

or passes extremely close to an object that

would usually be rejected. This is a false signal

but, to make sure, raise the head slightly and

pass over the object again. Only good objects

will continue to respond.

Ground Effect

The ground contains quantities of magnetic iron

oxides, of which some soils are more prolific

than others. Magnetic iron oxides create a

phenomenon known as 'ground effect'.

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