C-SCOPE METADEC2 Provozní pokyny stáhnout pdf (Strana 9)

Sensitivity

(A)

The

SENSITIVITY

CONTROL

regulates the sensitivity

of

the

detector

to

drift.

instability

etc

.•

as

well

as

to

metal objects. The recommended starting

point

is

O.

By

increasing

the

Sensitivity

by

tuning

this

control

into

the + sector

the

detector

will

be

more

prone

to

drift.

erratic signals. ground interference. etc. Where there

is

no ground

effect

or

outside inter-

ference the Sensitivity

Control

can

be

operated at higher levels.

But

when the signal becomes unsteady

or

erratic,

the

Sensitivity level should be reduced

to

obtain

a

clear. steady

tuning

threshold.

Only

when the

tuning

is

constant and steady

will

the

detector

operate

at the best

optimum

depth

penetration.

Pro-5et

Ground

(j)

By

operating this mode the level

of

ground exclude

is

set

to

a programmed level

of

ground exclude

for

INLAND

or

BEACH,

dependent

on

where the

Function

Ground

Exclude

Control

(S)

has

been set.

For

INLAND

sites, ensure

Function

Switch

is

set

to

one

of

the

INLAND

settings.

For

BEACH

sites, ensure

Function

Switch

is

set

to

one

of

the BEACH settings.

The red

LED

comes

on

when the pre-set mode

is

selected.

To

check whether

the

mode

is

operating.

operate the Status Retune

Button.

If

the mode

is

ON the

LED

will

light

up.

Auto

Tuning/Ground

liil

This

control

introduces a permanent signal wash

out

and makes the

METADEC

II

function

as

a

motion

detector. Generally. this mode

is

not

recommended

as

motion

detection

does reduce

depth

penetration

and makes

pin-pointing

more

difficult.

However.

Auto

Tuning

is

very useful on heavily contaminated

junk

sites, and can be

used

effectively

in

conjunction

with

Low

Sensitivity setting

(see

Diagram 10l.

It

is

also useful

to

engage

this

mode

after

an

object

has

been located and the

detector

is

laid

on

the

ground.

It

gives a guaranteed threshold

tuning

and ensures

that

the

detector

remains

correctly

tuned.

so

that

the search head can be

use,d

to

check each

portion

of

e.xcavated ground

for

the metal object.

Audio

Discriminate (iii) and meter Discriminate (iv)

The levels

of

Discrimination

or

Rejection are identical

in

both

modes

(Discrimination

can

be

defined

as

the

ability

to

give a

different

type

of

signal

for

ferrous

junk

or

worthless objects than the signal

given

by

a non-ferrous object).

Both

these Discriminate Modes are set

at

such a level, so

that

depth

penetration

to

coins etc.

is

good. and

discrimination

against most

iron

and silver

foil

is achieved. A

precise level

of

discrimination

is

selected

to

give

maximum

discrimination,

without

affecting sensitiVity

to

coins etc. Pull tabs, large silver

foil,

or

large

iron

will

not

be

rejected, because

the

levels

of

discrimination

required

to

reject these also reduce the

depth

penetration

to

certain non-ferrous metals

and

thin

section objects.

It

is

not

possible

to

reject a valuable object

with

the

METADEC

II's

AUDIO

or

METER

DISCRIMINATION

Modes.

You should

now

experiment

with

various coins. iron and silver

foil

to

test the reaction

of

the various

objects

so

that

you

will

be

able

to

correctly

interpret

the signals.

Hang the

detector

over a table

so

that

the search head

is

not

near metal. Set

the

detector

to

the

programmed levels

as

described, then

pass

objects across the search head.

The signal

is

separated

into

two

channels.

One

will

signal

the

presence

of

all metals

by

giving an increase in loudness.

The second

is

the Discriminate Channel and

will

function

either

as

a

METER

DISCRIMINATOR

or

an

AUDIO

DISCRIMINATOR

or

both.

In

METER

DISCRIMINATE

- The meter

will

analyse the object.

For

a bad object the meter signal

will

decrease towards the

left

hand

"reject"

position.

For

a good

object

the meter signal

will

increase

towards the

right

hand

"accept"

position

or

remain

still.

In

AUDIO

DISCRIMINATE

- The

pitch

of

the sound alters

to

analyse an object. A decrease

in

pitch

signals a bad object.

An

increase

in

pitch

or

no

change

signa,ls

a good object.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 18 19

Komentáře k této Příručce

Žádné komentáře