Fisher Labs M-101 User manual

M-101

Operating Manual

Rebar Locator & Metal Probe

FISHER RESEARCH LABORATORY

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

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

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

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

Specications ......................................................................... pg. 6

CONTENTS

SPECIFICATIONS

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 Conguration:........ 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)

.................................................

Subject to improvement or modication without notice.

Fisher Research Laboratory does not warrant suitability to specic use. Fisher

Research Laboratory shall in no event be liable for any direct, incidental, conse-

quential or indirect damages.

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, metal-

lic 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 berglass. The M-101 is not designed to be a wire or pipe tracer.

Fisher Research manufactures other specic equipment for that

purpose.

Description

The M-101 comes ready to use for searching in oors, 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.

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.

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 eld so that only a small portion of

the signal is inuenced by the metal target. Be aware that

if the target is to close to the coil, it is very difcult to get a

narrow response. This is when the use of a spacer will be

necessary.

Detectors electronic signal pattern

CONTROL PANEL

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 locat-

ing operation. MINimum or reduced sensitivity is used to

help pinpoint metal objects.

Penetration

Controls the depth of penetration. This knob is free spin-

ning 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.

PENETRATION

SENSITIVITY HEAD

PHONES

MIN

MAX

INCREASE

DECREASE

M-101

OPERATION

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.

TEST BATTERIES

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.

Place search coil on the surface that is to be scanned. Con-

tinue 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.)

Scan the area to be searched. When a maximum signal is

located, slowly reduce the Penetration control (turn coun-

ter-clockwise) 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.)

If you nd that it is difcult 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.

SCANNING

CONTROL PANEL

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 locat-

ing operation. MINimum or reduced sensitivity is used to

help pinpoint metal objects.

Penetration

Controls the depth of penetration. This knob is free spin-

ning 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.

PENETRATION

SENSITIVITY HEAD

PHONES

MIN

MAX

INCREASE

DECREASE

M-101

OPERATION

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.

TEST BATTERIES

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.

Place search coil on the surface that is to be scanned. Con-

tinue 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.)

Scan the area to be searched. When a maximum signal is

located, slowly reduce the Penetration control (turn coun-

ter-clockwise) 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.)

If you nd that it is difcult 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.

SCANNING