Product Manual
INTRODUCTION
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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.
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SPECIFICATIONS
TRANSMITTER
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
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.
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 Vm
2
, normal power
Magnetic Strength ...........................25 Vm
2
, high power
Battery Type .....................................Four D-cell batteries (included)
Battery Life ......................................
Over 100 hours in normal power mode
Weight, with batteries ......................4 lbs
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
ENVIRONMENTAL
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