A constant current termination for cable locating tones

Details A constant current termination for cable locating tones A constant current termination for cable locating tones

G - Physics

01

V

G01V 3/11 (2006.01) G01R 31/02 (2006.01) G01R 31/08 (2006.01)

Patent

CA 2285156

A constant current termination is provided for cable locating tones on communication and control cables that may be buried or placed in underground duct structures. The constant current termination limits the current on each branch of the cable to that required for cable location, thus ensuring that branches furthest from the tone source have adequate current for location purposes. The termination is the same for each branch, regardless of its position along the cable system. This eliminates the need to calibrate and recalibrate termination distances for a cable on installation and when branches are added. It also allows the location of damaged cables where the tone signal strength on a damaged brat is less than that for which the termination was designed.

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