Whites GMT Manuale utente

GMT Table of Contents

Chapter 1 Assembly...............................................................................2

Assembly Instructions .........................................................................................................................3

Chapter 2Batteries.................................................................................4

Standard Battery Holder......................................................................................................................4

Using the

Standard Battery Holder...................................................................................................................4

Rechargeable Battery(Opt.).................................................................................................................5

Battery Check ......................................................................................................................................5

Chapter 3 GMT Quick Start ..................................................................6

Quick Start

Instructions .......................................................................................................................................7

Chapter 4 Controls.................................................................................8

Gain Control/Power Off ......................................................................................................................8

Gain Adjustment..................................................................................................................................8

Gain Adjustment (cont'd) ....................................................................................................................9

Audio Signal Boost Toggle ...............................................................................................................10

Hot Rocks .......................................................................................................................................... 11

Variable SAT Speed Control.............................................................................................................. 11

VSAT Adjustment.............................................................................................................................. 11

Iron I.D. Trigger Adjustment .............................................................................................................12

Threshold Control .............................................................................................................................13

Threshold Adjustment .......................................................................................................................13

Ground Balance

Fast AutoTrac ..................................................................................................................................14

Manual Ground Balance....................................................................................................................15

Ground Balance Adjustment .............................................................................................................15

Chapter 5 Searching.............................................................................16

Pinpoint Technique............................................................................................................................16

Headphones .......................................................................................................................................17

Field Use & Tuning Tips ...................................................................................................................18

Field Use & Tuning Tips (cont'd)......................................................................................................20

Field Use & Tuning Tips (cont'd)......................................................................................................22

Chapter 6 Information..........................................................................24

Proper Care........................................................................................................................................24

Service ...............................................................................................................................................25

Warranty ............................................................................................................................................26

Warranty Transfer..............................................................................................................................27

Video and Owner Information...........................................................................................................28

GMT Table of Contents

NOTE: Due to Acrobat PDF limitations the Introductory page is on page 29

Assembly

Chapter 1 GMT Assembly

ELBOW

CUP

STRAP

ELBOW CUP

FOAM PADS

INSIDE ELBOW

CUP

CONTROL BOX

“S” ROD

LOOP CABLE

CAMLOCKS

WASHERS

BETWEEN

EACH LOOP

EAR & CLEVIS

METER / DISPLAY

1/ Iron I.D. % Probability Bar Graph

2/ Type of Minerallization ( 0 to 99 )

3/ Amount of Mineralization ( 0 to 99 )

4/ Battery Check Bar Graph or Message

5/ Overload Message

TOUCHPADS

1/ Grab

2/ Manual Gnd. Balance (-) (+)

AUDIO.

IRON I.D.

TOGGLE

CABLE RETAINERS

BATTERY

COMPARTMENT

DOOR

BATTERY

COMPARTMENT

LATCHES

LOOP CONNECTOR

HEADPHONE JACK

CLEVIS

LOWER

ROD

CENTER ROD

SECTION

Chapter 1 GMT Assembly

5. Grip the instrument by the handle, with your

arm in the elbow cup with strap secure, and sweep

the coil over the floor. If the instrument fit feels

uncomfortable, adjust the elbow cup by removing

and repositioning the bolt/thumbnut and installing

in one of the optional positions. If necessary,

readjust clevis/lower rod length with the sping clip

buttons so that the searchcoil can be held near the

floor without requiring stooping over.

6. Adjust the elbow cup strap so that it is loose

enough for you to slide your arm in and out with-

out loosening each time you want to set the detec-

tor down. Peel and stick elbow cup foam pads on

the inside of the elbow cup, one on each side.

7. Install battery as described in the next section,

decal facing down, with plastic tab and steel

contacts facing toward inside of battery compart-

ment.

8 It should be noted at this point that the detector

may not work as expected indoors due to the high

degree of metals ( nails, pipes, etc.) used in modern

construction and the presence of electrical interfer-

ence. It is best to tune and practice out-of-doors to

ensure stable, predictable results.

Assembly Instructions

1. Remove all parts from shipping carton and

check the assembly page to make sure all parts are

present.

2. Unlock "S" rod camlock and insert the reduced

end of the center rod into curved "S" rod so that

stainless steel spring clip buttons line up and lock

into the holes in the curved "S" rod. Turn

camlock to secure.

3. Fit the rubber washers between clevis/lower

rod and searchcoil ears. Use only non-metallic

washers, fiber bolt, and thumbnut, to secure loop

to clevis/lower rod. Then insert into center rod so

that stainless steel spring buttons line up and lock

into one of the adjustment holes in the center rod.

Turn Camlock to secure.

4. Unravel cable and wind the cable around the

clevis and rod assembly, first revolution should be

OVER the top of the rod with some slack before

applying the cable retainer. This is done so that

the search coil can be paddled backwards toward

the rod without putting a strain on the cable.

Wind cable firmly all the way to the handle toggle

switch.Then plug connector into control box

turn lock ring to secure. To secure cable, wrap

velcro cable retainers around rod and cable, one

near the searchcoil and one near the toggle switch.

Batteries

Chapter 2 GMT Batteries

Using the

Standard Battery Holder

1. Slide open the battery holder lid (decal side of

battery holder) by applying gentle upward

pressure on the tab of the door so that it unlocks.

Slide the door away from the battery box

exposing the cell positions.

2. Remove any old cells from the holder. Note the

(+) and (-) positions of each cell and the (+)

and (-) for each position marked inside the cell

tray. Install new “AA” cells noting carefully the

correct (+) and (-) positions.

If the cells are installed incorrectly, the detector

may require service by an Authorized

Service Center.

3. Slide the door closed so that it snaps securely.

4. Insert the battery holder into the detector so that

the decal is facing down, with the battery

holder door tab and metal contact points facing

toward the inside of the battery compartment.

Close the battery compartment door and secure the

two latches on the bottom of the case. Hook the

front of each latch first, then press down on the

rear.

CAUTION

Battery Holder #802-7150

LIFT TAB AND PULL

Standard Battery Holder

1. The standard battery holder holds eight “AA”

cell batteries. Alkalines are recommended for use

with this model. During normal searching condi-

tions you can expect about 40 or more hours of

hunting time from one set of eight alkaline

batteries.

2. Non-alkaline batteries can be used in this holder.

When non-alkalines or rechargeable “AA”

cells are used, detecting time (before replacement/

recharge) may be reduced to about 30-35

hours.

3. Once the batteries become weak, the beep over

metal targets will be reduced in volume.

Shortly thereafter, the instrument will no longer

respond to metals. TheAudio-Boost toggle

has a battery test position in the spring-loaded

down position. Battery level is noted on meter.

4. The battery compartment opens by gently

pulling down on the front of each of the two

latches (on the bottom of the control box) releasing

the catch and hinging open the door.

Chapter 2 GMT Batteries

Battery Check

When the Battery Test toggle is pressed downward,

battery condition is indicated on a bargraph on the

LCD display, and by audio pitch. If the batteries

are not fresh, audio loudness on big targets will not

be as great, but there will be no loss of sensitivity or

performance. Since Nicads and Alkalines die at

different voltages, it is not possible to have a Low

Bat & Bat OK indication, however the bargraph

fills to the right on a fully charged battery pack.As

the battery life drops you will note the bargraph

diminish. When the bargraph gets close to the left it

is time to replace or recharge. At this point the

bargraph changes to a message, "SORRY! LOW

BATT". Typical battery life will be in the neighbor-

hood of 40 hours or more.

Non-rechargeable batteries will start to drop in

voltage as soon as they are put into use and then

slowly diminish in voltage till they die. The Nicad

rechargeable battery pack, however, will diminish

voltage very slowly, in somewhat of a flat line and

then when they begin to lose their charge, the

voltage will drop like a rock. Headphone use pro-

longs all battery life. Battery life will vary a great

deal with temperature, number of target signals,

battery type, brand, and shelf life. Non-rechargeable

batteries may be used until the display indicates

"dead battery", or the audio loudness on large

targets is diminished more than you like. When

traveling far from home it is always a good idea to

carry 8 extra penlight alkaline batteries with you as

well as an extra empty battery holder.

Rechargeable Battery(Opt.)

A rechargeable battery system is not standard

equipment with your GMT, however, high quality

systems are available.

White's rechargeable battery #802-5211, and

charger #509-0022 are recommended and offer

quick charge and overnight charge options.

Rechargeable batteries deliver fairly constant

voltage until they're nearly dead. If you use them

until they are dead, they will deteriorate more

quickly than if you only use them till their voltage

starts to drop significantly. Therefore, recharge-

ables should be taken out of service and recharged

as soon as you notice the battery life starting to fall

substantially below the bargraph position that

corresponds to fully charged batteries.

The White's Rechargeable Nicad battery will not

provide the same amount of continuous use

as a full set of Alkaline batteries.

CAUTION

Battery #802-5211

SORRY!

LOW BATT

13 12 11.5 11 10.5 10 9.5 9 8.5 8 7.5 7 6.5 6

4.5

2.5

1.5

0.5

3.5

Any voltage reading

less than 8 volts-

charge for 5 hours

maximum on

Quick Charge

setting. Further

charging can

damage the

system.

Charging

Hours

Using the Battery Charger on Quick Charge Setting

Battery Voltage Reading

GMT Quick Start

Chapter 3 GMT Quick Start

GROUND BALACE Toggle

Two position switch for setting

either Fast AutoTrack or

Manual GROUND BALANCE

GAIN Control

For adjusting signal

strength coming from ground,

targets, and electrical interference

Audio THRESHOLD

Control that establishes

the sound level of the

background "hum"

Variable Self Adjusting Threshold

Speed Control (VSAT) for adjusting

the speed at which the THRESHOLD "hum" recovers

from the affects of changes in ground mineralization.

Audio Signal Boost Toggle

Switch-three position-On,

Off, and Battery Test

Iron I.D. Trigger Switch

three position-Forward,

Center, and Squeeze

Chapter 3 GMT Quick Start

Quick Start

Instructions

With the GMT properly assembled and the batter-

ies installed, follow the instructions below to start

finding those nuggets!

Set the Ground Balance Toggle to the

Fast Autotrac position. "▼"

Set the Audio Signal Boost to the center

(OFF) position. "▼"

Set the IRON I.D. toggle (under the hand

grip) to the center (Audio Iron I.D. OFF)

position.

Set the Variable SAT Speed between the

3x and 4x position. "▼"

Turn the GAIN control clockwise until the

power clicks "ON".

While holding the detector with the

search coil in the air, rotate the GAIN

control clockwise to a point between the

7 & 8 position. "▼"

Turn the THRESHOLD control fully

counterclockwise, then turn it clockwise

until you hear a soft threshold "hum".

Lower the search coil to the ground, then

“pump” the coil up and down 2"-4" a

couple of times and Fast AutoTrac will

automatically balance or track out the

ground mineralization.

Start swinging the search coil in wide

sweeps that overlap each other.

If you experience false signals or constant

beeping or popping, turn the GAIN down

a bit. You may notice a slight fluctuation in

the THRESHOLD “hum” as the GMT

tracks out the ground mineralization. Also,

if the meter and audio indicate "Bad Ground"

turn the GAIN down till overload goes away.

* SPECIAL NOTICE* SPECIAL NOTICE

* SPECIAL NOTICE

If you attempt to demonstrate or test the

GMT by waving targets in the air in front

of the search coil, it is ESSENTIALto

have the GROUND BALANCE toggle in

the MANUAL position, NOT FAST

AUTO TRAC

This is necessary, for when the GMT is in

the FAST AUTOTRAC position, the

search coil must SEE ground while it is

passing over the target or it will think

that the target IS ground and will attempt

to track it out. This is the case whether

you are demonstrating with or without

Iron ID.

You may, however, demonstrate the fast

ground balancing feature of FAST

AUTOTRAC or GRAB by waving or

pumping a mineralized rock in the air in

front of the search coil.

Thus, testing the GMT with targets while

in FASTAUTOTRAC must be done in or

on the ground.

Chapter 4 GMT Controls

Gain Control/Power Off

With the GAIN control, you increase the signal

strength coming from the ground. You might expect

increased signal strength to always find more

nuggets at greater depths. However, high ground

mineralization will "bounce" the signal back and

mask good targets. It is therefore necessary to

ADJUST the GAIN to give you the maximum

allowable GAIN without masking targets or over-

loading the circuit and at the same time allowing

you to operate the detector with a constant threshold

hum so that faint signals can be detected.

This is where the new GMT can help you out.

When ground mineralization is too high for the

current GAIN control setting, the display flashes

"BAD GROUND-REDUCE GAIN" along with

an audible "squawk". Reduce the GAIN till the

overload warning ceases. On occasion, while

searching, you might go over a very large or very

shallow target. The message on the LCD display

will read "METALTOO CLOSE LIFT

SEARCHCOIL". All such targets should be

checked but the GMT will self correct after the

message and you can continue to search as normal.

Gain Adjustment

1. The GAIN control knob turns the GMT ON and

OFF and controls the GAIN. Starting from the

POWER OFF position and going clockwise, the

power is turned ON and the dial increases the

GAIN from a minimum level of "1" to a maximum

level of "10". Set the control to the "Initial Setting

Triangle" ( between level 7& 8 ). While performing

this adjustment, make sure that the AUDIO SIG-

NAL BOOST toggle is in the OFF position.

2. Although the setting of (7-8) gives more than

ample GAIN, if the ground mineralization is low

enough, you might attempt to raise the GAIN above

this level toward 10. If, of course, "BAD GROUND

GAIN CONTROL

BAD GROUND ALERT MESSAGE

AUDIO SIGNAL BOOST

Controls

GROUND MINERALIZATION TOO IGH MESSAGE

LARGE OR SHALLOW TARGET MESSAGE

Gain Adjustment

(cont'd)

REDUCE GAIN" message is flashed, you must

heed it and reduce the GAIN rather than raise it.

3. The object of increasing the GAIN is to get the

maximum available depth from the detector WITH-

OUT causing the "BAD GROUND" message to

appear, which indicates an overload of the circuit.

4. In addition, any increase in GAIN adjustment

should NOT BE at the expense of maintaining a

smooth and constant THRESHOLD "hum". False

signals, beeps and bops from bits of mineralization,

erratic behavior, and lapses in THRESHOLD all

can be the result of running with too much GAIN.

5. The use of the VSAT (variable self-adjusting

threshold) control will also help to maintain a

smooth THRESHOLD "hum" and will be covered

in a later section.

6. While using a steady slow search coil sweep

speed, advance the control towards "10" while

maintaining a quiet smooth background THRESH-

OLD "hum". If the "BAD GROUND-REDUCE

GAIN" alert keeps popping up on the display or if

ground noises are still a problem reduce GAIN.

7. The IRON ID capability of the GMT also

functions more accurately when the GAIN is set at

a level which allows for smooth operation. Too

much GAIN can cause bad ground to distort the

proper identification of iron and non-iron targets.

In addition, just as a slow, broad search-coil speed

will maintain smooth threshold, it will also allow

the search-coil to get clear off of the target with

each pass, thus insuring that the GMT "sees"

ground as well as target. This is essential for the

accurate operation of % of Iron Probability ID.

FAST AUTOTRAC

POSITION

ON GROUND BALANCE

TOGGLE SWITCH

VSAT SPEED CONTROL

IRON I.D. BARGRAPH

Chapter 4 GMT Controls

AUDIO SIGNAL BOOST

BATTERY TEST

TOGGLE

Audio Signal Boost Toggle

The AUDIO SIGNAL BOOST toggle switch boosts

the sound (makes it louder) to help "hear" very deep

or small nuggets. AUDIO SIGNAL BOOST only

amplifies the sound AFTER processing thus it does

not cause signal overload. AUDIO SIGNAL

BOOST increases the chance of finding those tiny

flakes embedded in the cracks of bedrock and the

deeper, smaller targets to be found in dry washes

and tailings in the desert.

The center position or Initial Setting position

provides NO AUDIO SIGNAL BOOST. The FOR-

WARD position provides a 4X boost in the loudness

of the audio signal. The PULLED or spring loaded

position is used for BATTERY CHECK.

AUDIO SIGNAL BOOST is normally used on a

temporary or as-needed basis. Since it will also

boost the loudness of the background Threshold

"hum", it could mask other signals if used continu-

ously. If you are in an area that would benefit from

a continuous AUDIO SIGNAL BOOST, an adjust-

ment of the Threshold setting may be required.

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