US3839672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring the effectiveness of the shield in a coaxial cable
Assignee: Cooper Industries LLC
•
Filing: 1973-12-10
•
Granted: 1974-10-01
•
Expires: 1993-12-10
Abstract
Abstract A method and apparatus are described for measuring the effectiveness of the shield of a coaxial cable. A first load is connected between the central conductor and the shield of a segment of the coaxial cable. A pair of mutually insulated coaxial tubes are positioned surrounding and substantially coaxial with the segment of coaxial cable and a second load is connected between corresponding ends of the tubes. One of the loads is driven and the leakage through the shield of the coaxial cable is detected by measuring the signal developed across the undriven load.
Inventors
- 👤 G Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:43
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/16; G01R31/00; G01R31/50; G01R31/58
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
A method for measuring the effectiveness of the shield in a segment of coaxial cable, comprising, connecting a first load between the conductor and the shield of the cable segment at one end thereof, positioning a pair of mutually insulated coaxial tubes of different diameters telescoped with respect to each other surrounding and substantially coaxial with the coaxial cable segment, connecting a second load between corresponding ends of the tube, driving one of the loads by applying an a-c signal thereto at the end opposite that at which the driven load is connected, and detecting the leakage of the applied signal through the shield by measuring the signal developed across the undriven load.
Claim 2
Independent Claim
113 words
A method for measuring the effectiveness of the shield in a segment of coaxial cable, comprising, connecting a first load between the conductor and the shield of the cable segment at one end thereof, positioning a pair of mutually insulated coaxial tubes of different diameters telescoped with respect to each other surrounding and substantially coaxial with the coaxial cable segment, connecting a second load between corresponding ends of the tube, driving one of the loads by applying an a-c signal thereto at the end opposite that at which the driven load is connected, and detecting the leakage of the applied signal through the shield by measuring the signal developed across the undriven load.
Claim 3
Dependent Claim
36 words
A method according to claim 1 wherein the first load is driven and wherein the leakage is detected by measuring the signal between the coaxial tubes at the end of the tubes opposite the second load.
Claim 4
Dependent Claim
38 words
A method according to claim 1 wherein the second load is driven and wherein the leakage is detected by measuring the signal between the shield and the conductor at the end of the segment opposite the first load.
Claim 5
Dependent Claim
120 words
Apparatus for measuring the effectiveness of the shield in a segment of coaxial cable, comprising, means for connecting a first load between the conductor and the shield of the cable segment being tested at one end thereof, a pair of mutually insulated coaxial tubes of different diameters telescoped with respect to each other surrounding and substantially coaxial with the coaxial cable segment, a second load connected between corresponding ends of the tubes, means for driving one of the loads by applying an a-c signal thereto at the end opposite that at which the said driven load is connected, and means for detecting the leakage of the applied signal through the shield by measuring the signal developed across said undriven load.
Claim 6
Dependent Claim
120 words
Apparatus for measuring the effectiveness of the shield in a segment of coaxial cable, comprising, means for connecting a first load between the conductor and the shield of the cable segment being tested at one end thereof, a pair of mutually insulated coaxial tubes of different diameters telescoped with respect to each other surrounding and substantially coaxial with the coaxial cable segment, a second load connected between corresponding ends of the tubes, means for driving one of the loads by applying an a-c signal thereto at the end opposite that at which the said driven load is connected, and means for detecting the leakage of the applied signal through the shield by measuring the signal developed across said undriven load.
Claim 7
Dependent Claim
40 words
Apparatus according to claim 4 wherein said driving means is connected to the conductor and the shield of said cable segment, and wherein said detecting means is connected to said coaxial tubes at the end thereof opposite said second load.
Claim 8
Dependent Claim
50 words
Apparatus according to claim 4 wherein said driving means is connected to the ends of said tubes opposite said second load to drive said second load, and wherein said detecting means is connected between the shield and the conductor of said segment at the end thereof opposite said first load.
Claim 9
Dependent Claim
19 words
Apparatus according to claim 4 including conductive means for closing the ends of the outermost one of said tubes.
Claim 10
Dependent Claim
38 words
Apparatus according to claim 4 including a plastic tube for coaxially enclosing and surrounding the cable segment, and a plurality of non-conductive spacers for supporting said plastic tube in spaced relation to the innermost one of said tubes.
References Cited (Backward Citations)
US2176757A
Cited
US2362372A
Cited
US2519407A
Cited
US2747160A
Cited
US2881389A
Cited
US3564404A
Cited
US3462682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |