Fisher TW-7700 manual Accessories, Coupling Clamp, Headsets

ACCESSORIES

Coupling Clamp

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 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.

This represents a jumper

Headsets

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.

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