TW-82
DIGITAL LINE TRACER
Operating Manual
F I S H E R R E S E A R C H L A B O R A T O R Y
CONTENTS
Introduction ..........................................................................pg. 3
Transmitter ...........................................................................pg. 4-6
Receiver ..................................................................................pg. 7-9
Specifications ........................................................................pg. 10
Warranty ................................................................................. pg. 11
Accessories ............................................................................. pg. 12
INTRODUCTION
The TW-82 Digital Line Tracer components include a Transmitter,
Receiver, ground-rod assembly, carrying case (soft or optional
hard case) and an operator’s manual. The TW-82 is a single
frequency line tracer.
The TW82 is an active locating line tracer. There are three
locating methods that an operator can use to trace a utility.
1. The conductive method is the preferred method, as a strong
signal is transmitted directly through the utility line. A
conductive trace is accomplished by making a direct electrical
connection to the utility with a clamp.
2. When a direct electrical connection is not available, but the
operator has some knowledge of where one point of the utility
may be, the transmitter can be placed on the ground over
the utility. With this inductive tracing method, the signal is
transmitted through the ground and couples magnetically on to
utilities in close proximity.
3. A third method is also inductive, but uses the optional coupling
clamp. A coupling clamp can be used when a utility is exposed,
but a direct electrical connection is not possible. By fitting the
coupling clamp around the utility, the signal transmits through
the air and couples magnetically on to the utility.
Never make direct contact with electrical or communication lines
that are in service. To trace such lines in service, perform an
inductive trace, either with or without the coupling clamp.
1
3
TW-82 TRANSMITTER
current
current
depth
TW-82 Transmitter
The Transmitter has two controls: & .
The Button has a dual function:
1. When the Transmitter is powered on, switches
the device between normal (1/4 watt) and high (1.0 watt)
output.
2. With the Transmitter powered off:
A. Press-and-hold to program the
Power-Down
Successive presses of will show a flashing
battery indicator, followed by a blank screen or the
illuminated battery indicator.
• An illuminated battery indicator means that
• A blank screen means that Auto Power-Down
is deactivated.
B. After you release , the transmitter
power will turn on.
Auto Power-Down is activated.
With the Auto Power-Down feature activated, the
Transmitter will automatically turn off 60 minutes after
the last key-pad press by the user. This is a battery saving
feature. The Transmitter will warn of power-down as
described on the following page.
feature.
Auto
TW-82 TRANSMITTER
Low Battery Power-Down Warning
When the Transmitter batteries are near the end of their
useful life, the Transmitter will warn the operator before
shutting down.
Five minutes before shutting down, the Transmitter will
alternately stop and start transmitting at approximately onesecond intervals. The operator using the Receiver, even at a
distance from the Transmitter, will notice the signal turning
on and off before the power turns off completely.
Accessory Output
1. Flip up the black protective cover to expose the Accessory
Output.
2. Plug in the Cable Jack for conductive tracing.
When the conductive tracing cable is connected, Signal
Current will be displayed. The Signal Current Bar Graph
shows the quality of the connection.
Automatic Load Impedance Matching adjusts output to
provide full rated power over a wide range of loads (e.g.
utility types and conditions). It is tolerant of both dry
(high resistance) and shunted (low resistance) ground
connections.
The Transmitter has a built-in antenna for inductive
locating. When the Cable Jack is not connected, the inductive
antenna automatically engages and begins transmitting.
When locating inductively, the Signal Current Bar Graph
will not be displayed, as there is no conductive trace load to
be measured.
WARNING: Do not handle output leads unless power is off.
ELECTRIC SHOCK HAZARD: Servicing to be performed by
qualified personnel only.
NEVER connect conductive cables to an energized power
line.
5
TW-82 TRANSMITTER
INDUCTIVE LOCATING
Inductive locating is most effective with
the Transmitter straddling the utility as
illustrated, with the utility perpendicular to
the Transmitter’s batteries.
If the utility direction is unknown,
place Transmitter on the ground, power
on, and sweep the Receiver a complete
360º around the Transmitter, keeping
at least a 25-foot (8-meter) distance
between the Transmitter and Receiver.
If unsuccessful, move the Transmitter
to another location. When located, the
Receiver’s azimuth indicator will show
the direction of the utility.
In inductive mode, the Transmitter’s LCD will
not display Signal Current. When the ground
rod is plugged in, the Signal Current display
will illuminate.
CONDUCTIVE LOCATING
1. Connect the Ground Rod
assembly to the Transmitter.
2. Push the Ground Rod into
the earth at a 90º angle to the
direction of the utility.
3. Connect the red clamp to the
non-energized utility.
4. Connect the black clamp to the
Ground Rod.
Be sure not to place the wires
over any other utility.
5. Move at least 25 feet (8 meters) away from the
connection point.
6. Sweep the Receiver in a circle around the connection
point.
7. Using information provided on the display,
find the areas that need to be traced and analyze the
situation in more detail to find the buried utility.
6
TW-82 RECEIVER
TW-82 Receiver
SINGLE BUTTON OPERATION
• Power-Up: Press Button to turn ON
• Volume Control: Tap the Button to adjust volume
1. Mute
2. Very Low
3. Low
4. Medium
5. High
Continued presses of the button cycles
back to setting #1.
• Power-Down: Press-and-Hold Button to turn OFF
DISPLAY
1. Signal Strength: Indicates your proximity to the center of the
electromagnetic field emitted by the utility.
999: maximum value
0: minimum value
You may find different locations where the
Signal Strength value is high. Use this
reading as a relative indicator as to where
the utility is located. Signal Strength is
strongly influenced by the depth of the
utility.
7
PITCH INCREASES
AS YOU APPROACH THE UTILITY
HIGHEST PITCH & VOLUME
DIRECTLY OVER UTILITY
CONSTANT
PITCH BEYOND 45°
CONSTANT
PITCH BEYOND 45°
45°
VOLUME DECREASES WITH DISTANCE FROM UTILITY
TW-82 RECEIVER
Display - Continued
2. Battery Strength: When battery life
declines to less than 1 hour (estimated)
of operation the battery indicator outline
will be illuminated with no segments.
When the batteries reach the end of their
useful life, the screen will go blank and the
battery icon will flash before the Receiver shuts off. Expect about
60 hours of battery life from a set of two D-cell alkaline batteries.
3. Left/Right
& Over-Target: These indicators show your position relative to
the center of the electromagnetic field.
Move to Move to You are over
the left the right the target
Audio: When you move within a 45º angle of the center of the
electromagnetic field, the audio pitch will change.
The pitch increases as you approach the utility and is highest
over the top of the utility. Outside the 45º zone, the pitch and
volume do not change.
When you are standing to the right of the utility, you will hear a
4. Azimuth: These arrows indicate the utility’s path relative to
your position. When you are close
to, or over, the suspected
target, rotate the device
and notice the arrows.
8
constant tone, and to the left, a pulsating sound.
current
current
depth
TW-82 RECEIVER
5. Current Measure:
mA (miliAmperes) of current
Use Current Measure as
flowing on the conductor.
an aid for distinguishing
utilities in close proximity.
The Current Measure will
generally be the highest on
the utility you are connected
directly to, regardless of the utility’s depth.
6. Depth
Depth reading is
only accurate if the
electromagnetic field is
perfectly round.
The electromagnetic field
must have enough energy
for the device to accurately
calculate the depth. The
weaker the signal strength,
the less reliable the depth indicator. For this reason, depth
readings for inductively located utilities will tend to be less
accurate than conductively located ones.
The depth reading is the distance between the tip of Receiver
blade and the center of the electromagnetic field. The center of the
electromagnetic field is generally the center of the utility. The only
100% reliable method for determining depth is to hand-excavate.
AUTO POWER-DOWN, RECEIVER
When 90 minutes have passed without the operator pressing the
control button, the Receiver will automatically power down.
• Lower left of the display will indicate “OFF”.
• Lower right of the display will count down from 10 to 0.
• The Transmitter will then turn off.
To stop Auto Power-Down, press the button once.
94
SPECIFICATIONS
RECEIVER
Frequency ........................................ 82.175 kHz
Left/Right Guidance ........................ Audible and visual
Azimuth Indicator ........................... Visual
Over-Target Indicator ..................... Visual and audible
Battery Status ................................. Visual
Signal Strength Indicator ............... Numeric display & audible
Signal Current Measurement ........ Numeric display, automatic
Depth Measurement ....................... Numeric display, automatic
Battery Type .................................... Two D-cell batteries (included)
Battery Life ..................................... 60 hours, approximate
Weight, with batteries ..................... 3.60 lbs
TRANSMITTER
Output Frequency ............................82.175 kHz
Output Power (nominal) ..................Normal Setting = 0.25 watt
High Setting = 1.0 watt
Conductive Tracing ..........................2 to 3,000 ohms, normal power-6dB
Magnetic Strength ...........................2 to 8,000 ohms, high power-6dB
Inductive Tracing .............................15 Vm2, normal power
Magnetic Strength ...........................25 Vm
Battery Type .....................................Four D-cell batteries (included)
Battery Life ......................................
Weight, with batteries ......................4 lbs
.....................
......................
2
, high power
Over 100 hours in normal power mode
ENVIRONMENTAL
Ingress Protection Rating ................IP65 (stands up to water jets)
Operating Temperature Range ........-4ºF to 140ºF (-20ºC to +60ºC)
Relative Humidity ............................0 to 95% noncondensing
Shipping Weight (packaged) ............17.5 lbs
Field Carry Weight, w/accessories ...15.5 lbs*
*Includes Carry Case, Batteries, Ground Rod and Conductive Tracing Cables
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.
10
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 relies on Fisher.
Our instruments are durable, dependable and locate deeper.
R E P U T A T I O N
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.
Factory warranty follows the channel of distribution.
Warranty does not cover shipping costs.
S E R V I C E
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: info@fisherlab.com
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.
Not to be used with conductive tracing cables longer than 6.5’ ( 1.98 m)
11
TW-82 ACCESSORIES
3 Inch
Coupling Clamp
– CCLAMP-3
Useful for in-service and
electrical power line tracing
when a metal-to-metal hookup is
not possible
5 Inch
Coupling Clamp
– CCLAMP-5
Useful for in-service and
electrical power line tracing
when a metal-to-metal hookup is
not possible
Hard Carry Case
– 1802050000
Shock absorbent protective hard
carrying case with contoured
foam insert custom made to
house the TW82.
35” x 7” x 16”
Fisher Sonde Signal
Transmitter 82kHz
– SONDE-82.175
Small transmitter used to trace
the path of non-metallic pipes
and locate blockage in lines.
Sonde is inserted into a pipe or
duct by means of a push rod and
located using a Fisher receiver.
• Rugged Design
• Long Battery Life
• Outstanding Distance & Depth
Locate up to 15’ deep
• Operating Frequency: 82 kHz
• Weight 6.4 oz
• Length 6”
• Diameter 2”
• Battery Life: 70 hrs
• Operating Temperature
-20 to +60 C (4° to 140°F)
• End Cap Thread 3/8”-16 x 3/4”
MTW82 101510
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