M-101
Operating Manual
Rebar Locator & Metal Probe
F I S H E R R E S E A R C H L A B O R A T O R Y
Introduction ........................................................................... pg. 2
Control Panel ......................................................................... pg. 3
Operation ................................................................................ pg. 4
Principles of Operation ........................................................ pg. 5
Specications ......................................................................... 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 Conguration: ........ 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 modication without notice.
Fisher Research Laboratory does not warrant suitability to specic 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, 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 berglass. The M-101 is not designed to be a wire or pipe tracer.
Fisher Research manufactures other specic equipment for that
purpose.
1
2
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.
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 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.
3
PENETRATION
SENSITIVITY
HEAD
PHONES
MIN
MAX
B
A
T
T
E
R
Y
T
E
S
T
INCREASE
DECREASE
M-101
OPERATION
TEST BATTERIES
SCANNING
4
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
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. 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.)
3.
Scan the area to be searched. When a maximum signal is
located, slowly reduce the Penetration control (turn counter-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.)
4.
If you nd that it is difcult 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
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 specic equipment for that
purpose.
1
Description
5
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 inuenced by the metal target. Be aware that
if the target is to close to the coil, it is very difcult to get a
narrow response. This is when the use of a spacer will be
necessary.
Detectors electronic signal pattern
6
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 Conguration: ........ 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 modication without notice.
Fisher Research Laboratory does not warrant suitability to specic use. Fisher
Research Laboratory shall in no event be liable for any direct, incidental, consequential or indirect damages.
Q U A L I T Y
Fisher detectors are renowned for their quality.
Each detector is hand crafted in the USA with pride
P E R F O R M A N C E
The worldwide underground utility industry relys on Fisher.
Our instruments are durable, dependable, and locate deeper.
R E P U T A T I O N
Fisher produced the rst patented metal detector in 1931. For
over 70 years, the Fisher logo has been a mark of excellence.
2 - YEAR LIMITED WARRANTY
Fisher believes in the products we produce and backs this belief
with a 2 year limited warranty.
Proof of purchase is required to make a claim under this warranty.
NOTE TO FOREIGN COUNTRY CUSTOMERS
This warranty may vary in other countries, check with your
distributor for details.
Factory warranty follows the channel of distribution.
Warranty does not cover shipping costs.
S E R V I C E
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
1465-H Henry Brennan,
El Paso, Texas 79936
Tel 915.225.0333 Fax 915.225.0336
www.sherlab.com email:info@sherlab.com
FRL8700060 07-20-09
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