US4015200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiconductor cable testing apparatus
Assignee: Malmo TestEquipment AB
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Filing: 1975-11-24
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Granted: 1977-03-29
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Expires: 1995-11-24
Abstract
Abstract Multiconductor cable testing apparatus for sequentially testing the conductors of an electric cable for open-circuit, short-circuit and for incorrect connection, the results of the tests being visually displayed so that the actual fault and the conductor or conductors involved can be easily determined.
Inventors
- 👤 Mix Tommy Strandh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:47
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/58; G01R31/60; G01R31/52; G01R31/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
219 words
A multiconductor cable testing apparatus, comprising: a. a plurality of pairs of terminal connectors for connection to the ends of a corresponding plurality of conductors to be tested; b. a test voltage source in series with each of said pairs of connectors; c. a corresponding plurality of normally open first contacts, each in series with a corresponding one of said pairs of terminal connectors; d. a corresponding plurality of first impedance means, each in series with a corresponding one of said pairs of terminal connectors; e. second impedance means in series with each of said first contacts; f. a corresponding plurality of normally open second contacts for applying a reference potential when closed, to one terminal connector of a corresponding one of said pairs of terminal connectors; g. the testing apparatus having a first testing position wherein a selected one of said first contacts is closed and the corresponding second contact open, and a second testing position wherein said selected one of said first contacts and said corresponding second contact are both closed; and h. a single voltage sensing means for sensing the voltage across said second impedance means in said first and second testing positions, predetermined values of the sensed voltages across said second impedance means representing open-circuit, short-circuit and incorrect wiring, respectively, for the conductor under test.
Claim 2
Dependent Claim
219 words
A multiconductor cable testing apparatus, comprising: a. a plurality of pairs of terminal connectors for connection to the ends of a corresponding plurality of conductors to be tested; b. a test voltage source in series with each of said pairs of connectors; c. a corresponding plurality of normally open first contacts, each in series with a corresponding one of said pairs of terminal connectors; d. a corresponding plurality of first impedance means, each in series with a corresponding one of said pairs of terminal connectors; e. second impedance means in series with each of said first contacts; f. a corresponding plurality of normally open second contacts for applying a reference potential when closed, to one terminal connector of a corresponding one of said pairs of terminal connectors; g. the testing apparatus having a first testing position wherein a selected one of said first contacts is closed and the corresponding second contact open, and a second testing position wherein said selected one of said first contacts and said corresponding second contact are both closed; and h. a single voltage sensing means for sensing the voltage across said second impedance means in said first and second testing positions, predetermined values of the sensed voltages across said second impedance means representing open-circuit, short-circuit and incorrect wiring, respectively, for the conductor under test.
Claim 3
Dependent Claim
24 words
Apparatus according to claim 1, wherein sequentially operated relay means is provided for testing each conductor in turn, for open-circuit, short-circuit and incorrect connection.
Claim 4
Dependent Claim
55 words
Apparatus according to claim 2, wherein said relay means, for each conductor to be tested is sequence, closes the associated first contact to perform a first test for open-circuit and closed-circuit, and then closes the associated second contact whilst maintaining the first contact closed to perform a second test for incorrect connection of the conductors.
Claim 5
Dependent Claim
44 words
Apparatus according to claim 1, wherein said voltage sensing means includes first and second comparator means arranged in parallel for comparing said voltage across said second impedance means with a first and a second reference voltage respectively in said first and second comparator means.
Claim 6
Dependent Claim
88 words
Apparatus according to claim 4, wherein said first reference voltage is above zero volts, but below R b .sup.. V/(R a + R b ) volts, and said second reference voltage is above R b .sup.. V/(R a + R b ) volts, but below R b .sup.. V/(0.5R a + R b ) volts, wherein R a is the resistance of each of said first impedance means, R b is the resistance of said second impedance means, and V is the voltage of said test voltage source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |