Fisher Research Labs M-97 Bedienungsanleitung

M-97

Operating Manual

Valve, Pedestal & Box Locator

QUALITY

Fisher detectors are renowned for their quality.

Each detector is hand crafted in the USA with pride

PERFORMANCE

The worldwide underground utility industry relies on Fisher.

Our instruments are durable, dependable and locate deeper.

REPUTATION

Fisher produced the first patented metal detector in 1931. For

over 80 years, the Fisher logo has been a mark of excellence.

2 - YEAR LIMITED WARRANTY

Proof of purchase is required to make a claim under this warranty.

NOTE TO CUSTOMERS OUTSIDE THE U.S.A.

This warranty may vary in other countries, check with your

distributor for details.

Warranty does not cover shipping costs.

SERVICE

Should you have any questions or problems, contact:

FISHER RESEARCH LABORATORY

1465-H Henry Brennan, El Paso, Texas 79936

Tel 1800-685-5050 Fax 915-225-0336

www.fisherlab.com email: [email protected]

According to FCC part 15.21 Changes or Modifications made to this device

not expressly approved by the party responsible for compliance could void

the users authority to operate this equipment.

8700004000 Rev2 011111

CONTENTS

About Your M-97.......................................................................pg. 2

Features.....................................................................................pg. 3

Setting Up ..................................................................................pg. 3

Controls .....................................................................................pg. 4

Using Headphones ...................................................................pg. 5

Tuning ........................................................................................pg. 5

Searching ..................................................................................pg. 6

Specifications ...........................................................................pg. 7

Warranty ........................................................................ Back Cover

ABOUT YOUR M-97

Using ideas that you, our valued customers, have passed on to us, the

M-97 Valve and Box Locator stands as the new and improved addition

to our line of highly successful M-95 and M-96 Locators.

The M-97 is an all-metal metal detector that can search through

concrete and asphalt and was designed for finding buried or paved

over valves, boxes, or manhole covers, or any other concealed metallic

object. It also locates targets made of aluminum, brass and lead. Please

remember, like all Valve and Box Locators, the M-97 is a Metal Detector

which should not be used as a substitute for a Utility Line Tracer. Fisher

Research Laboratory manufactures a complete line of equipment for

Line Tracing (Pipe and Cable Tracing).

New to the M series is the ease with which the M-97 can be stored.

Just compact the lower stem, twist the search coil 90 degrees, and fold

the search coil flat. The M-97 fits easily into the optional carrying case.

In the Fisher tradition, the M-97 is affordable, tough, and simple to use

while providing maximum performance. A two year limited warranty

comes standard with the unit.

SPECIFICATIONS

Subject to improvement or modification without notice.

Output Frequencies of search coil ........... 4.5 kHz

Sensitivity ............... 0.20 mv RMS for full scale

Sensitivity Adjustment Range..................... 12:1

Output Indication . Meter 1 milliamp, ...... 0-100 linear scale

............................. Speaker ...................... 16-ohm impedance

............................. Headset (optional) ... 8-ohm impedance

............................. Audio Frequency....... 450 Hz

Power Supply +9V supplies: ....................... (2) 9V batteries

Battery Life Alkaline .................................... 15-25 hours

Power Consumption .................................. (-9V) 13.8 mA

................................. At min. sound 8 mA

................................. At max. sound 50 mA

................................. At Audio threshold 17.5 to 18.5 mA

Search Coil Configuration ......................... Double-D

Weight with 8-inch search coil ................. 3.3 lbs. (1.5kg)

11-inch search coil................. 3.9 lbs. (1.8kg)

Dimensions ............. 38 to 50 inches adjustable (96 to 127 cm)

Shipping Dimensions 6” x 13” x 35” (15.12 x 32.76 x 82.2 cm)

Fisher Research Laboratory does not warrant suitability to

specific use. Fisher Research Laboratory shall in no event

be liable for any direct, incidental, consequential or indirect

damages.

OPTIONAL ACCESSORIES:

Heaphones

Coil Covers

11” search coil

Hard carrying case

Vinyl carrying bag

SEARCHING

It is a good idea to establish a methodic search pattern. Avoid swinging

the M-97 like a golf club, swing the detector side to side keeping the

search coil the same distance above the ground. Your sweep pattern

should be a slow, half-circle motion. If you are searching for a small

target, it is a good idea to overlap your sweeps.

When the detector’s search coil starts to pass over a metal object,

the sound will increase and the meter readings will increase. Depending

upon the size and depth of the target, the target may appear (respond)

to be larger than it should. To get a visual outline of the target, you need

to reduce the sensitive of the M-97 by raising the coil and passing over

the target. This can help establish the edges of the target.

Another method that will give a visual outline is to purposely detune

the M-97. Move the coil away from the target. Slowly bring the search

coil toward the target. As the sound increases, press and release the

Retune Button. Continue to move the coil toward and eventually over

the target. The sound and meter readings will be more responsive as the

search coil passes over the target. You may need to repeat this step

more times if the target is at a shallow depth. Be aware that you can

loose responsiveness of the target by over reducing the Tuning Control

(sensitivity) of the M-97.

To reset the M-97 back to the balanced settings, lift the search coil off

the ground, and away from any metallic objects and press and release

the Retune Button. The M-97 will automatically retune to the original,

balanced settings.

• Two knobs and a pushbutton for simple operation

• Adjustable shaft with double locking stem

• Ground Effect Rejection VLF eliminates annoying or false signals

from wet ground foliage, pavement or mineralized ground

• High sensitivity for maximum penetration through soil, asphalt

or concrete

• Built-in Battery Test

• Pushbutton Tuning to quickly & easily maintain optimum sensitivity

• Ultra Slow Auto-Tune to stabilize ground tuning and minimize

frequency drift

• Identifies metallic objects by speaker sound and needle

movement

• Compact size for convenient storage

• Waterproof search coil

FEATURES

SETTING UP

The M-97 comes ready to use.

Extend the lower stem of the M-97 so that the search coil rests be-

tween 6 to 12 inches in front of your feet. Your arm should be straight

and relaxed with your grip held loosely.

Tighten the locking nut/compression nut at the bottom of the upper

stem.

When the proper length is selected, the excess cable should be wound

around the stem. This can be done by slightly loosening the locking nut

and turning the lower stem, or by removing the search coil and winding

the cable by hand. Be sure to leave some slack in the cable.

Check the batteries by turning the Mode control to Battery Test posi-

tion and turning the Ground control to any number. A reading between

80 and 100 indicates the batteries are OK.

*With the 11” coil you must slide the lower stem completely out of the

upper assembly for the M-97 to properly fit in the hard carrying case.

CONTROLS

Meter

The meter of the M-97 serves

two purposes for the opera-

tion of the instrument. When

used in the battery test mode,

the meter gives a visual indi-

cation of the battery strength.

A reading between 80 – 100

is desirable. If the reading is

below 80, search depth and

accuracy can decrease.

Please change the batteries, if

necessary. (Note: The batteries must be inserted correctly for the M-97 to

operate. Match up the correct battery terminals with the markings on the

inside of the battery holder. Failure to do so will not damage the instrument,

however, the instrument will not function).

When searching with the M-97, the meter gives a visual indication to any

change occurring in the field of detection. This is primarily due to the coil

passing over or near a metal object, but can occur when the ground

mineral conditions change.

On/Off Ground Rejection Control

This control turns the M-97 on and off. It is used to electronically balance the

M-97 to compensate for the natural mineral content of the soil or ground

surface. When tuned properly, raising and lowering the search coil above

the ground will not cause a change in the meter reading or audio tone.

Mode Switch

This control is used to change the mode function of the Locator.

Battery Test

With the detector turned on, the Battery Test mode will indicate

battery strength. This is a no-load battery test.

Normal

This setting is used for the Turn On and Go mode. The Normal

Mode requires very little Ground Rejection adjustment.

High

This setting is used for increasing the sensitivity of the M-97,which also

increases the depth searching capabilities of the instrument.

Retune Button

When this button is depressed, the instrument will rebalance itself to the

instrument settings and prevailing ground conditions.

M-97 Control Panel

Using headphones (not included) improves battery life, and prevents

the sounds from bothering 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.

USING HEADPHONES

TUNING THE M-97

There are two methods to tune and balance the M-97. One method

is for quick and easy operation; the other will allow you fine tune the

detector for deeper searching and greater sensitivity.

Turn On and Go Method

Select an area that is free of metal near and under the search coil. Turn

on the M-97 by setting the Mode control to “Normal” and Ground control

to the position “5”. (Hint: If the M-97 is loud sounding when the instrument

is turned on, press and release the Retune Button to quiet the instrument).

Raise the search coil about 12 to 18 inches above the ground (dirt, con-

crete, asphalt, etc.), and press and release the Retune Button.

Lower the coil close to the ground. There should be little or no change

in the tone of the detector. If the M-97 changes tone when the coil is

lowered to the ground, there is either a metallic object near the coil that

is causing the instrument to respond, or the soil conditions are such that

the M-97 needs to be more precisely balanced.

Proceed with locating your targets.

Precision Tuning Method

(This method can be used for the “Normal” setting, and must be used

for the “High” setting).

Select an area that is free of metal near and under the search coil.

Turn on the M-97 by setting the Mode control to “Normal” and Ground

control to the position “5”. Raise the search coil about 12 to 18 inches

above the ground (dirt, concrete, asphalt, etc.), and press and release

the Retune Button. Note any change of sound. If there is no change, or

only a slight change, the M-97 is balanced and ready to search.

If the sounds changes: Sound increases – Slightly decrease the Ground

setting. Repeat above procedure. Sound decreases – Slightly increase

the Ground setting. Repeat above procedure.Repeat until no (or a

slight) change of sound occurs.

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