Fisher TW-7700 User Manual download pdf (Page 3)

DESCRIPTION

The TW-7700 Digital Line Tracer consists of a transmitter, receiver,

ground-plate/ground-rod assembly, carrying case (hard or soft),

and

an operators manual. The TW-7700 is a single frequency line tracer.

The TW-7700 is an active locating line tracer. There

are three methods of active locating that an operator

can use to trace a utility. The conductive method is

the most preferred method, since a strong transmitter

signal is transmitted through the intended target. The

inductive method is the easiest method to use, but

may not yield the best results. When a direct connec-

tion is not available, but the operator has good knowl-

edge of where one point of the utility may be, the op-

erator can place the Transmitter over the utility mak-

ing sure that the arrow on top of the transmitter is

parallel to the path of the utility. The third method of

active locating involves using the coupling clamp ac-

cessory. The coupling clamp is used when the utility is

exposed, but a direct connection is not available. The

clamp jaws are opened and placed around the utility.

The clamp never makes a direct connection with the

utility, that is, the utility can move freely with the

clamp around it.

The features of the TW-7700 make it a very easy and

practical instrument in today’s world of underground

locating.

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Fisher TW-7700 User Manual Page 3