Introduction - Fisher TW-82P Operating Manual

INTRODUCTION

The TW-82P Digital Line Tracer components include a
Transmitter, Receiver and Ground-Rod Assembly.
The TW-82P is an active single-frequency and passive power
current line tracer that is used to locate and trace buried
utilities using any of the following four tracing methods:
1. Conductive Method. With this method, the Transmitter
energizes the buried utility by making a direct electrical
connection to it with Conductive Tracing Cables. In most
cases, this method generates the strongest magnetic field for
the Receiver to detect above ground.
2. Inductive Method. When a direct physical connection
to the utility is unavailable, the utility may be energized
indirectly by magnetically coupling an energizing current
from the Transmitter. Some prior knowledge of the utility's
location is required so that the Transmitter can be placed
and oriented, on the ground, near the utility in the most
effective manner.
3. Coupling. In some cases a utility may be exposed, but
does not provide a direct connection for the conductive
tracing cables. The optional accessory coupling clamp can be
clamped around the exposed utility to magnetically couple
an energizing current from the Transmitter into the utility.
4. Passive Power. 50Hz and 60Hz electric current flows on
underground power lines and also on underground utilities
that are not power lines. In Passive Power Mode, the TW-82P
can detect this electric current using the Receiver as a stand-
alone instrument without need for a transmitter.
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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