Fischer Technology M-101 Instruction Manual

M-101

Rebar Locator & Metal Probe

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Operating Manual

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

TORY

CONTENTS

Introduction ........................................................................... pg. 2

Control Panel ......................................................................... pg. 3

Operation ................................................................................ pg. 4

Principles of Operation ....................................................... pg. 5

Specifications......................................................................... pg. 6

INTRODUCTION

The M-101 is a metal detector with a small search coil that pro­vides a concentrated search signal. The M-101 will respond to all
types of metal (rebar, wire mesh, metal conduit, metallic trash,
metallic targets on the opposite side of surface to be scanned,
etc.) which may be associated with the area that is to be
searched. The M-101 will not respond to non-metallic targets such
as plastic or fiberglass. The M-101 is not designed to be a wire or
pipe tracer. Fisher Research manufactures other specific equip­ment for that purpose.

Description

The M-101 comes ready to use for searching in floors, walls,
columns, and ceilings. The control housing is designed to
be chest or belt mounted for ease of use and comfort.
A carrying bag is included in the package.

1

2

CONTROL PANEL

PENETRATION

M-1 0 1

DECREASE

SENSITIVITY

MIN

MAX

INCREASE

B
A

T
T
E
R

T
E
S
T

Y

Sensitivity

This control turns the M-101 On & Off. It also permits
a wide range of sensitivity to metal targets. MAXimum
position is normally used in the initial scanning and
locating operation. MINimum or reduced sensitivity is
used to help pinpoint metal objects.

Penetration

Controls the depth of penetration. This knob is free
spinning and does not have stops in either direction.

Meter

Gives a visual display of signal strength and Battery Test

Battery Test

Used to test the condition of the batteries in the M-101.

Battery Access

The M-101 is powered by two 9 volt batteries. Access to
the batteries is on the back of the detector.

HEAD

PHONES

3

OPERATION

TEST BATTERIES

Turn the M-101 On (Sensitivity control knob). Depress the
Battery Test button. A response of 80 or more on the meter
indicates batteries are in an operable condition.
NOTE: Occasionally check the batteries during use, as weak
batteries could lead to reduced signal depth.

SCANNING

1.

Turn the M-101 On (Sensitivity control knob) to the RED
arrow. If there is a sound and meter reading, reduce (turn
counter-clockwise) the Penetration control, or move search
coil away from any nearby metal.

2.

Place search coil on the surface that is to be scanned. Con­tinue to keep it away from any metal objects. Adjust the
Penetration control until the meter reads 10. (To increase
the meter reading, turn the Penetration control clockwise;
to decrease the meter reading, turn the control-counter clock­wise.)

3.

Scan the area to be searched. When a maximum signal is
located, slowly reduce the Penetration control (turn counter­clockwise) to narrow the response area. This narrow re­sponse should be the center line of the target. It should be
directly underneath the red line on the search coil. (Note:
As you reduce the Penetration, be careful not to completely
cancel out the target.)

4.

If you find that it is difficult to get a narrow response, it
may be to your advantage to increase the distance from the
search coil to the target. Use a clean spacer such as a piece
of wood to elevate the coil. You may still need to adjust the
Sensitivity to pinpoint the target.

4

PRINCIPLES OF OPERATION

When the unit is properly tuned, the M-101 will locate ½ inch
(1.25 cm) diameter rebar 8 to 9 inches (20 to 23 cm) from the
bottom of the search coil. A larger target can be located
deeper, a smaller target shallower.

Detectors electronic signal pattern

With the M-101 initially tuned, the search pattern is wide
and deep (diagram A) , and as the operator reduces the
Sensitivity and Penetration, the search signal of the M-101
changes shape (diagram B). Thus, the idea for operation
is to reduce the search field so that only a small portion of
the signal is influenced by the metal target. Be aware that
if the target is to close to the coil, it is very difficult to get a
narrow response. This is when the use of a spacer will be
necessary.

5

SPECIFICATIONS

Subject to improvement or modification without notice.

Operating Frequency of Search Coil: .... 4.5 kHz

Sensitivity Adjustment Range: 12:1

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

........................................... Speaker - 16 Ohm impedance

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

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

Power Supply: ................ +/- 9 V, (2) 9V NEDA 1604

Coil Configuration: ....... Double D

Weight: ............................. 2.8 lbs (1.3 kg)

Dimensions: .................... Control Box ........... 3 x 5 x 6 inches (8 x 12 x 16 cm)

........................................... Handle ................... 0.75 x 23 inches (1.9 x 58.4 cm)

Shipping Weight: ........... 4 lbs (1.8 kg)

Shipping Dimensions: .. 26.5 x 6.25 x 6.25 inches (67 x 16 x 16 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.

6

QUALITY

Fisher detectors are renowned for their quality.

Each instrument is hand crafted in the USA with pride

PERFORMANCE

Our detectors are durable, dependable, and search deeper.

REPUTATION

Fisher produced the first patented metal detector in 1931. For
over 70 years, the Fisher logo has been a mark of excellence.

2 - Y E A R W A R R A N T Y

Fisher believes in the products we produce and backs this belief

with a 2 year limited warranty, Warranty may vary outside the

United States. See your dealer for details

SERVICE

Fisher is committed to providing you, our valued customer, with
superior service. Each and every instrument is rigidly tested and

carefully inspected during assembly and before shipment.

Should you have any questions or problems, contact:

FISHER RESEARCH LABORATORY

200 West Willmott Road.,

Los Banos, California 93635

Tel [phone] Fax [phone]

www.fisherlab.com email:[e-mail]

EXPORT DEPARTMENT

P.O. Box 1896

New Haven, CT 06508 USA

Tel [phone] Fax [phone]

email: [e-mail]