Triplett 3399 Fiche technique télécharger pdf (Page 39)

to the other wire. Notice that at approximately the midpoint

between the wires, the tracer tone becomes very weak. This

is the “null point” . . . the place where the signal from one

wire cancels the signal from the other wire. Notice how this

null differs from simple loss of signal . . . that is, there’s a

very narrow zone where the null occurs, and the signal gets

stronger quite rapidly on either side of the null. By waving

the HOUND 3 back and forth while slowly moving along the

length of the wire, the path of the null point can be followed

between the wires. These wires can be thought of as being

on either side of the open fault . . . so by using this tech-

nique, it will be possible to localize the area in which the

fault occurs.

TRIPLETT

TONE

CONTINUITY

TALK

WARBLE

OFF / LINE POLARITY

STRONG

SIGNAL

NULL

SIGNAL

FADES

Figure 7

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Triplett 3399 Fiche technique Page 39