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5

DISCRIMINATION POINTS

By adjusting the TRASH REJECTION control you will be able to

reject (or “discriminate”) small pieces of metallic trash and

ground minerals while detecting valuable targets. The lowest

setting at which an object is rejected is referred to as the

object’s “discrimination point.” Discrimination points are

determined by such factors as size, shape, depth, type of

metal and ground mineralization.

Typical 1212-X audio responses over 1 inch deep targets with

search coil sweeping 2 to 3 inches above ground.

Note that the terms “discrimination” and “trash rejection” are

used interchangeably.

1. Scatter some sample targets such as coins, pull

tabs and small pieces of foil on the ground 1 to 2

feet apart.

2. Turn the TRASH REJECTION control to zero.

3. Hold the search coil about 2 inches above and

parallel to the ground. Move it slowly over the

samples and note the sharp loud response as you

pass over each one. Keep in mind that the 1212-X

is a motion detector and responds only when the

search coil (or the target) is moving.

4. Increase the TRASH REJECTION control to a

setting of 3 and again pass over the targets.

Repeat this process at settings 4, 5, 6 and so on to

10. You will note that as you increase the level of

trash rejection, the 1212-X will reject some targets

and continue to respond to others. You have

now determined the discrimination points for the

rejected objects. For example, the small nail

discrimination point may be at 4 and the pull tab

discrimination at 6.

5. The 1212-X will remain silent when some objects

are rejected, however, other objects may “snap,

crackle and pop” as they are rejected. This is a

perfectly normal response indicating that the

powerful discrimination circuitry is doing its job.

6.  Large pieces of trash such as beer cans or jar

lids may sound like a good target no matter what

Summary of Contents for 1212-X

Page 1: ...1212 X Operating Manual One Knob Metal Detector F I S H E R R E S E A R C H L A B O R A T O R Y...

Page 2: ...n Points pg 5 Searching pg 7 Pinpointing pg 9 Recovery Tools pg 11 Target Recovery pg 11 Operating Tips pg 12 False Signals pg 13 Battery Replacement pg 14 Maintenance pg 15 Treasure Hunter s Code Of...

Page 3: ...rejection level and start searching No tuning no meter no gimmicks Performance If you ve tested other detectors in this price range you re in for a pleasant surprise In fact you may find that your 121...

Page 4: ...knut 5 Adjust the stem length using the locknut and the coil angle using the nylon wing nut so that the search coil rests flat on the ground about 6 inches in front of and slightly to the right of you...

Page 5: ...aight until the search coil is about 2 inches above the ground and 12 inches in front of your foot The search coil should be parallel to the ground and may have to be slightly readjusted at this point...

Page 6: ...ack accepts most stereo and mono headphones with 1 4 diameter plugs When used the speaker is automaticallydisconnected A headphone can be very helpful when hunting in noisy areas or detecting faint si...

Page 7: ...l to the ground Move it slowly over the samples and note the sharp loud response as you pass over each one Keep in mind that the 1212 X is a motion detector and responds only when the search coil or t...

Page 8: ...ls of discrimination Note that as you increase the discrimination level you progressively eliminate more targets including some good ones such as nickels and gold rings NOTE The discriination levels s...

Page 9: ...d targets and can lower the rejection level for pinpointing zero trash rejection will produce the strongest signal over small or deep targets 2 Search slowly and systematically sweeping in a tight sem...

Page 10: ...tivity If you try that with your 1212 X you ll actually lose sensitivity When the stem length is properly adjusted the 1212 X is balanced for sweeping in a tight semicircle Always overlap your sweeps...

Page 11: ...and rest it on the ground 6 Your target should be below the Hot Spot of the search coil which is marked by a bull s eye slightly below the center of the coil 7 Slowly move the coil aside keeping your...

Page 12: ...slow or fast sweep speed b Trash rejection set at 10 c Highly mineralized soil 2 GOOD DEPTH a Moderate sweep speed b Trash rejection set at 5 c Moderately mineralized soil 3 MAXIMUM DEPTH a Moderate...

Page 13: ...a separate booklet enclosed with your 1212 X WHICHEVER TOOL OR METHOD YOU CHOOSE REMEMBER THAT RESPONSIBLE TREASURE HUNTERS TAKE PRIDE IN THEIR ABILITY TO LEAVE SOIL AND VEGETATION INTACT AND UNDAMAGE...

Page 14: ...y a coin when working in unfamiliar territory and check it at different Trash Rejection levels There is some sensitivity loss at higher levels of discrimination The greater the ground mineralization t...

Page 15: ...do You may reduce the number of false signals by increasing the trash rejection level Some other sources of false signals are 1 ELECTRICAL INTERFERENCE Caused by radio TV stations power lines or nearb...

Page 16: ...to sound off each time you sweep your search coil beneath it Very weak or no audio response means that it s time to change the battery A single 9 volt transistor battery is attached to the inside of...

Page 17: ...ALWAYS do whatever you can to give the hobby of Treasure Hunting the good image it needs and deserves Your 1212 X doesn t require a lot of care but there are a few things you should do to keep it in...

Page 18: ...park ranger before attempting to use your detector Bureau of Land Management BLM Lands Some areas are open for metal detecting and some are not Always check with the district office City or County Par...

Page 19: ...Batteries 1 9V Transistor Battery Life Carbon Zinc 10 15 Hours Alkaline 25 35 Hours Notes 1 Subject to improvement or modification without notice 2 Approximate 3 Pulsegate Unipolar Audio Processing Ad...

Page 20: ...with a lifetime warranty the best in the industry on all of our consumer detectors Warranty may vary outside of the United States See your dealer for details S E R V I C E Fisher is committed to prov...

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