Chauvin Arnoux LOCAT-N C.A 6681 Manual De Instrucciones página 52

English
Remarks:
The transition resistance of the line break must be greater than 100kOhms.
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Note that, when breaks in multi-conductor cables are traced, all the other
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wires of the cable or of the shielded conductor must be earthed. This is
necessary to prevent cross coupling of the applied signals (by a capacitive
effect) on the terminals of the source.
The earth connected to the transmitter can be a auxiliary earth, the earthing
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terminal of a power outlet, or a correctly earthed water pipe.
When the line is traced, the place at which the signal received by the receiver
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falls off suddenly is the location of the break.
Refine the detection by setting the power level transmitted by the
transmitter and the sensitivity of the receiver in manual mode.
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Fig.12
C.A 6681 Cable Locater