user manual

ACCESSORIES

The coupling clamp is useful when the utility is exposed,

and a direct connection is not possible. It is plugged into

the same plug-in socket as the ground-plate/ground-rod

assembly. The coupling clamp only operates at the 82

kHz frequency. The coupling clamp will fit around utili-

ties that are 3-¼ inches in diameter or smaller. The length

of the cable is approximately 10 feet.

Coupling Clamp

Fisher Research Laboratory has a variety of headsets avail-

able.

•Ultra-quiet deluxe Fisher Phones. High quality sound

while reducing the outside noise.

•Standard Stereo Headphones

•Single Earpiece Headset. Enables the operator to effec-

tively listen to the TW-7700 and remain aware of noise in

close proximity.

Headsets

This represents a jumper

Coupling Clamp Applications Diagram

A. The coupling clamp is for all

tracing applications with con-

ductors exposed; exception, an

open circuit at line’s termination.

B. A ground must be provided for

the proper current flow when the

coupling clamp is used at a ter-

mination.

C. The coupling clamp must be

used between the grounding

and where the line goes under-

ground.

D. Trace signal will return to

ground when incorrectly

coupled.

E. Signal will be transmitted in

both directions when connect-

ing is midway in a long conductor.

F. Drop lines or laterals divide the

signal strength in half at each

junction.