Chauvin Arnoux C.A 6681 Notice De Fonctionnement page 62

English
3.3.5 SORTING OR IDENTIFICATION OF CONDUCTORS BY PAIR
Preconditions:
The circuit must be dead.
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The ends of the wires of each pair must be twisted together and be mutually
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conducting; each pair remains insulated from the others.
Connect the transmitter as shown in Fig. 22.
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The measurement method is the same as in the example.
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Remarks:
The ends of each pair must be twisted together (pairwise) in order to ensure
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perfect continuity.
When several transmitters are used, each transmitter must be set to a
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different transmission code
If only one transmitter is used, make several measurements with different
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connections between the transmitter and the various pairs.
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Fig.22
C.A 6681 Cable Locater