Fisher CZ-21 QuickSilver User Manual

CZ-21 QuickSilver

Deep Search, Land and Underwater, Target I.D. Metal Detector

Operating Manual

F I S H E R R E S E A R C H L A B S

CONTENTS

..............................................................About Your Detector		pg. 1
Condensed Operating Instructions ......................................		pg. 3
Headphones ...........................................................................		pg. 4
	Assembly................................................................................	pg. 5
Setting Up ................................................................................		pg. 6
	For Land or Shallow Water..................................................	pg. 6
	For Diving .............................................................................	pg. 7
	For Hipmounting..................................................................	pg. 8
Control Panel ..........................................................................		pg. 10
Turn on Procedure ..................................................................		pg. 11
Ground Balancing ..................................................................		pg. 11
	Touch Pad............................................................................	pg. 12
	Bobbing................................................................................	pg. 13
Search Modes.........................................................................		pg. 15
	Auto Tune.............................................................................	pg. 15
	Target I.D..............................................................................	pg. 16
Searching on Land or in Shallow Water ...............................		pg. 18
Searching Underwater ...........................................................		pg. 21
Pinpointing ..............................................................................		pg. 22
Target Identification...............................................................		pg. 23
Target Recovery .....................................................................		pg. 27
Recovery Tools........................................................................		pg. 28
False Signals............................................................................		pg. 29
Battery Replacement .............................................................		pg. 33
Maintenance ..........................................................................		pg. 35
Battery Door Gasket: Orientation .........................................		pg. 36
Where To Use Your Metal Detector In the U.S. .....................		pg. 37
Specifications .........................................................................		pg. 38
Treasure Hunters’ Code of Ethics ..........................................		pg. 40

ABOUT YOUR DETECTOR

    Your CZ-21 QuickSilver is an all-purpose metal detector engineered for land, beach, salt and fresh-water treasure hunters. Here are some important features:

1.  Leakproof: Submersible to 250 feet.

2.  3-Tone Target I.D.: A low tone for iron, a mid-tone for pull tabs, foil and most gold rings, and a high tone for U.S. coins, silver rings and some gold rings.

3.  Depth: Patented Fourier domain signal analysis. Two deep-seeking, ground-compensating VLF signals (one at 5 KHz and one at 15 KHz) provide twice as much target information for accurate analysis and identification.

4.  Two Search Modes: A silent running, slow motion target I.D. mode and a hot, autotune mode for allmetal searching.

5.  VCO No-Motion Pinpointing: Tap the pinpoint button and the audio tone increases in pitch and volume as the center of the coil approaches the target.

6.  Big-Target Alert: The CZ-21 circuits may overload on large, shallow targets. A distinctive bell tone immediately warns you that the target is too large to identify.

7.  Faint-Target Audio Boost: As you increase the volume level past “5”, strong target sounds remain at a fixed volume while faint, deep-target sounds continue to get louder.

8.  Quick Manual Ground Balance: Tap the pinpoint button and lower the coil to the ground. Then set the ground control just below the audio tone and

you are precisely tuned for on-site conditions.

9.  Separately Sealed Battery Compartment: Protects the electronics from accidental flooding.

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ABOUT YOUR DETECTOR

10.  Search Coils: The CZ-21 comes with the 8” coil as standard equipment, but can also be custom ordered with the 10” coil. All coils are permanently attached.

11.Balanced,ComfortableandHipmountable:Cushioned arm rest, soft foam grip and a control housing that slips off the handle and onto your belt.

12.Salt Water Compensation: Salt water is electrically conductive, and therefore induces a strong signal in the searchcoil. Unlike most other metal detectors, the CZ-21 uses Fourier Domain signal analysis to cancel the salt water signal. Under most conditions you will not experience any false signals from salt water. When working in the surf zone at high sensitivity settings you may hear an occasional

“whisper” which is easily ignored.

13.  Easy to Use: Just pick it up, set the control on the red circles and start searching in a “coins-only” mode. Or for maximum performance, adjust the controls for your own specific situation.

    Read this instruction manual thoroughly, practice often and you’re in for some exciting treasure hunting. Drop us a line if you have any questions, comments or good finds to tell us about. In the meantime . . .

Happy Hunting,

Fisher Research Labs

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CONDENSED OPERATING INSTRUCTIONS

Factory Pre-Set “Turn-On-and-Go” Marks

    Your CZ-21 QuickSilver is simple to operate. Even so, we strongly recommend that you read this entire manual. You’ll be able to tune your CZ-21 to your specific needs and conditions.

Figure 1. Factory pre-set turn-on-and-go marks (circled in red or blue on your CZ-21 control panel) can get you up and running immediately.

	Pre-set Audio	Salt-water Pre-set
		SENSITIVITY at “3”
	Boost mark
	at “5”

Freshwater sensitivity Pre-set at “7”

	Pre-set	Pre-set
	DISCRIMINATION
		GROUND at “5”
	at “4”

1.  Set all the controls to the red “Turn-On-and-Go” pre-set:

		GROUND	= 5
		DISC	= 4
		SENSITIVITY	= 3
		VOLUME	= 5

This puts you in a “coins-only” mode, and you’re ready to start searching. Keep in mind that the GROUND setting of “5” is probably not the optimum setting for the ground you’re searching. The sensitivity level is set low to reduce false signals caused by ground mineralization.

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CONDENSED OPERATING INSTRUCTIONS

2.Adjust the volume control for a comfortable volume when the coil is passed over a large, shallow target.

3.Travel slowly, overlap your sweeps and keep the search coil moving. Remember, you’re in a “motion” search mode, and the coil must be in motion to detect a target.

4.When you get a good, repeatable signal, pinpoint the target.

Using Headphones

Using headphones (not supplied) improves battery life, and prevents the sounds from annoying bystanders.

It also allows you to hear subtle changes in the sound more clearly, particularly if searching in a noisy location. For safety reasons, do not use

headphones near traffic or where other dangers are present. This device is to be used with interconnecting cables/headphone cables shorter than three meters.

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ASSEMBLY

Your Fisher CZ-21 requires little assembly. Handle it carefully, care for it regularly, and it will give you years of dependable service.

1.Remove the headphone, handle and search coil assemblies from the box. Be careful not to put any strain on the cable connections.

2.Adjust the lower stem to the approximate length you will be using: extended for stand-up use or as short as possible for diving. To extend the lower stem, push in the spring lock, pull out the lower stem and let the spring lock snap into another hole.

3.Unwind just enough cable to attach the search coil to the lower stem.

4.Remove the bolt and wing nut from the search coil. Line up the hole in the lower stem between the two holes in the search coil “ears.” Attach the coil to the stem with the bolt and wing nut and finger tighten.

5.The arm rest may be repositioned for maximum comfort by removing the arm-rest screw, sliding the arm rest to the next screw hole and re-inserting the arm-rest screw.

Control Housing	Battery Access Panel
Control Panel	8-inch
	Spider
Target I.D. Decal	coil
Foam Hand Grip	Nylon
	Wing Nut
Adjustable Arm Rest	Fiberglass Reinforced
	Nylon Lower Stem
	7-foot Search Coil Cable

		Fiberglass Upper Stem	Submersible
Arm-rest Screw
Figure 2. CZ-21 Quicksilver Detector.			Headphones

Headphon

Plug

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ASSEMBLY

Adjustable Arm Rest

Upper Stem

Screw Hole

Figure 3.

Screw

SETTING UP

Figure 4.

When searching on land or in shallow water, keep your arm straight and your search coil no more than 2 inches above the ground.

SETTING UP FOR LAND OR SHALLOW WATER

Put the headphones around your neck to keep them out of the way while making the following adjustments:

1.Adjust the stem length and coil angle so the search coil rests flat on the ground about 6 inches in front and slightly to the right of your foot (to the left of your left foot if you’re left handed).

2.Leave enough slack in the coil cable to allow the

		coil to swivel as far as it can in either direction. The
		coil wing nut should be tight enough to prevent the
		coil from moving.
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SETTING UP

3.You should now be able to move into your “search” position by leaning slightly forward and raising the search coil no more than 2 inches above the ground. Your arm should still be straight, and the coil should be parallel to the ground, about 12 inches in front of your foot. The coil angle may have to be slightly readjusted at this point.

SETTING UP FOR DIVING

Unlike most VLF metal detectors, the CZ-21 works well in salt water. This capability, along with its deep-seeking sensitivity, makes it ideal for underwater treasure hunting and wreck diving. The CZ-21 is waterproof to a depth of 250 feet. Remember, always practice safe diving methods.

When diving with your CZ-21, use the shortest stem length possible, with the extra cable wrapped tightly around the stem, as closely as possible to the control housing. Never hipmount your control housing while diving.

1.Adjust the stem length as short as you can without having the search coil detect your diving gear.

2.Adjust the search coil parallel to the sea bed, river or lake bottom.

3.Make sure extra cable is coiled tightly on the upper stem as closely as possible to the control housing, with just enough slack near the search coil to allow it to swivel as far as it can in either direction. Too much loose cable near the search coil may generate false signals.

4.Remove the tethered earphone plugs for rapid pressure equalization as you dive and return to the surface.

Control housing

Figure 5.

Shortened stem length

Extra, coiled cable

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SETTING UP

Caution: Hipmounting the CZ-21 control housing is not recommended for underwater use. The search coil cable may become entangled with a submerged object, making it difficult for the diver to resurface quickly in case of emergency.

SETTING UP FOR HIPMOUNTING

For nearly-effortless treasure hunting, the control housing is easily removed from the handle and attached to the belt clip (included).

Figure 6. You can hipmount your CZ-21 by sliding the control housing from the handle and attaching it to your belt. This reduces the weight of the stem, creating nearly effortless hunting.

INSTRUCTION FOR REMOVAL OF CZ-21 FROM HANDLE

WARNING DO NOT DO THIS

Do not push on unit from the back (battery side.). Doing this will most likely cause unit to release suddenly and fly off, impacting on the control knobs on the floor, and damaging the unit.

THIS TYPE OF DAMAGE WILL VOID YOUR WARRANTY

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SETTING UP

Hold unit firmly and separate handle, being careful not to drop the control unit and damage it. Place unit battery side down with battery cover on table top, or a flat stable surface and grasp the unit firmly in one hand and the handle grip firmly in the other.

“Hipmounting” the CZ-21 in this manner takes about half the weight off the handle and allows the land or shallow-water treasure hunter to search much longer without arm fatigue.

1.Slide the belt clip into grooves on the bottom of the control housing. This is a snug fit, and you’ll have to bend the clip slightly.

2.Unwrap just enough of the coil cable to allow for searching.

3.Slip the control housing onto your belt, left side for right handers, right side for left handers.

NOTE: Because of the extreme sensitivity of the CZ-21 search coil, hipmounting the control housing may produce a false signal when the search coil reaches the end of its arc (on the side that the control box is attached to your belt). Depending on your stem length and how high you have the housing hipmounted, the search coil may actually detect the housing.

WARRANTY NOTICE:

Damage to coil cable at housing connection is not warrantable if damaged by excessive force.

If hipmounting, please leave slack in the cable so as not to yank the cable from the housing at the end of your sweep.

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CONTROL PANEL

1.  VOLUME/OFF: Power on-off and volume control. Volume is gradually increased from 1-5 settings. From 5-10, loud-target response is held constant while faint targets continue to get louder.

2.  DISC: In the 0-6 positions, the CZ-21 is in the target I.D. mode, which is a silent, no-threshold, motion-discrimination mode of operation with the ability to identify and then ignore (“reject”) or accept many kinds of small metal targets. In the AUTOTUNE position, the CZ-21 is in an allmetal mode. In this mode, the CZ-21 has a slightly wider and deeper search pattern, however, it lacks the ability to discriminate or identify and reject targets.

3.  GROUND: Used to electronically cancel the effects of ground mineralization. Proper use of this control will minimize false ground signals and ensure that the CZ-21 is operating at its maximum potential in just about any ground condition including wet ocean sand.

4.SENS (Sensitivity)/BATT TEST:

SENSITIVITY: The higher the setting, the more sensitive the detector. Start at lower sensitivity setting until you gain experience with the detector. • is the suggested default setting for salt water hunting. p is suggested for fresh water.

BATT TEST: To test batteries

1.Reduce volume to low level

2.Put on headphones

3.Rotate SENS knob to BATT TEST position

4.Rotate VOLUME knob to increase volume

As you rotate to “10” the volume and tone will indicate

1	4
	3
2
Figure 7.	5
Control Panel

10

CONTROL PANEL

battery strength.

Good batteries: Loud, high pitched tone

Weak batteries: Soft, low pitched tone or “ticking” sound Batteries need replacing: No tone

During use, the speaker volume will fade and become nearly inaudible before the detector performance is compromised by weak batteries.

5.  PINPOINT: ActivatingthePINPOINTfeaturewiththecenter- positionedbuttonentersaNO-MOTIONdetectionmode.In this mode of operation, the detector will emit a monotone hum whenever metal enters the coil’s field of detection.

To use pinpoint, PRESS the button. The pinpoint button will not deflect with pressure; you will feel no movement in the button. A 2nd press of

the button will return you to your previous motion detection mode.

A moderate pressure,

applied briefly to the

center of the button, is required.

The button requires a 2-second wait between presses.

GROUND BALANCING

    When your CZ-21 QuickSilver is properly “ground balanced,” it will have only a minimal response to ground mineralization. Precise adjustment of the GROUND control is critical for optimum performance. The higher the degree of ground mineralization or the higher the sensitivity setting, the more critical it is to have your machine properly ground balanced. Once you adjust it in either the Autotune mode or Target-I.D. mode, you can switch back and forth between the two modes without resetting. Recheck your setting occasionally as you search because ground conditions often change rapidly.

    Ifyouhavedifficultygroundbalancing,tryreducingyoursensitivity level or moving to another spot just in case you are over a buried piece of metal. In some areas of high ground mineralization you may not be able to use the touch pad method.

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GROUND BALANCING

QUICK G.B. METHOD

    This will probably be your method of choice in all but the most difficult of ground conditions. It’s fast, easy and accurate. You can use this method in either the Autotune or Target-I.D. mode.

1.With GROUND control at “10” hold your search coil 6 to 12 inches off the ground. Make sure you’re at least 3 feet away from any metal objects.

2.Tap the PINPOINT button and lower the search coil to the ground. Rotate the GROUND control clockwise until you hear an audio tone. Then back off to the exact point where the tone disappears.

3.Always ground balance your CZ-21 in the areas you intend to search, whether it’s on land or underwater.

NOTES:

1.  If you get an audio response as you first lower the coil with the GROUND control at “10,” you’re probably over a piece of metal. Move and try again.

2.  If you get a sudden bell tone that is not preceded by an increasing audio response as you lower the coil, you’re probably in some very highly mineralized soil or sand. In this case, it’s best to use the “bobbing” method.

3.  If you don’t get any audio response, or just a very faint one as you rotate the GROUND control from “10” all the way to “0,” you’re probably in an area where there’s very little ground mineralization. Just leave the GROUND control at “10” and begin searching.

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