Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Patent
1997-05-29
1999-11-23
Do, Diep N.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
324527, 324539, 324541, 324551, G01R 3108, G01R 3102
Patent
active
059906871
ABSTRACT:
A system for determining if there is a break in the shield or a compromise in the shielding effectiveness of coaxial cable plant by inducing a reference test signal onto the sheath or outer conductor of a coaxial cable. Concurrent testing is done with a digital sampling receiver for the presence of some of the induced reference signal on the inner or center conductor of the cable. The test current may be introduced directly onto the coax's sheath by magnetically coupling with a split ferrite core, or it may be applied indirectly by inducing the current onto a conductor, such as a grounding wire, that attaches to the coaxial cable. The test signal on the center conductor may be received back at the headend, or it may be received near the injection point by breaking the coaxial cable, or by connecting a probe to the center conductor. The invention may employ ranging to determine the distance to the shield break. This system is particularly useful to detect the source of interference on the upstream or reverse portion of the networks.
REFERENCES:
patent: 3909712 (1975-09-01), Rietz et al.
patent: 4072899 (1978-02-01), Shimp
patent: 4114089 (1978-09-01), Ahmed
patent: 4325022 (1982-04-01), Pelletier
patent: 4404514 (1983-09-01), Reichert
patent: 4546309 (1985-10-01), Kang et al.
patent: 4857830 (1989-08-01), Matsuno
patent: 4973911 (1990-11-01), Marshall
patent: 5391991 (1995-02-01), Tuttle
patent: 5471144 (1995-11-01), Meyer
patent: 5488303 (1996-01-01), Bagalini
Williams, Thomas, "Proofing And Maintaining Upstream Cable Plant With Digital Signal Analysis Techniques", Holtzman Engineering, pp. 1-12. (undated).
"The Absorbing Clamp And Its Application For The Measurement of Interference Power", IEC 1986, pp. 165-168. (month unavailable).
Rohdes & Schwarz, "Absorbing Clamps MDS-21 and MDS-22", EN 50083-2, 1995 pp. 1-4, 9-11, 28 & 29. (month unavailble).
LandOfFree
Measuring shield breaks in coaxial cable by a sheath test curren does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Measuring shield breaks in coaxial cable by a sheath test curren, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Measuring shield breaks in coaxial cable by a sheath test curren will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1225869