Patent US2485895A successfully refreshed from Google Patents.
Patent US3894284A successfully refreshed from Google Patents.
US3894284A
Expired / Lapsed
US
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Current flow test apparatus
Assignee: CMC TELECOM Corp
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Filing: 1974-04-29
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Granted: 1975-07-08
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Expires: 1994-04-29
Abstract
Abstract The current flow test apparatus has a test connector with first and second test terminal connectors. A power connector has first and second power terminal connectors, a transistorized active current regulating circuit has a power supply input for receiving power, first and second signal input/output circuits and a reference input. The regulating circuit responds to the level of signal at the reference input for regulating proportionately the level of current passing between the input/output circuits of the regulating circuit. Manually adjustable potentiometers set the signal at the reference input to various levels. A power supply has first and second input circuits, respectively, connected to the first and second power terminal connectors for receiving power and an output circuit coupled to the power supply input of the regulating circuit. The power supply provides electrical power to the regulating circuit and significantly includes a transformer for providing a D.C. isolation between the output and input circuits of the power supply. Manually operable mode switching circuits selectively couple the first and second input/output circuits of the current regulating circuit, separately, to the first and second test terminal connectors and to the first and second power terminal connectors, in various combinations. A visual indicator indicates the current passing between the first and second input/output circuits of the current regulating circuit.
Inventors
- 👤 Ralph Morrison
- 👤 Orrin B O'dea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:13
CPC Classifications
H; H04; H04Q; H04Q1/00; H04Q1/18; H04Q1/20; G; G01; G01R; G01R31/00; G01R31/327; G01R31/3277; G01R31/3278
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
241 words
Current flow test apparatus comprising: a. first and second current input/output circuits for the test apparatus; b. first and second power input circuits for the test apparatus; c. an active current regulating circuit comprising a power supply input for receiving power therefor, first and second signal input/output circuits and a reference input, the regulating circuit having a D.C. isolation from the power input circuits and operative for regulating the level of current passing between the input/output circuits of the regulating circuit to a contant level corresponding to the level of the signal applied at said reference input; d. a power supply having first and second input circuits, respectively, connected to said first and second power input circuits for receiving power and an output circuit coupled to the power supply input of said regulating circuit, said power supply providing electrical power to said regulating circuit and comprising means for providing a D.C. isolation between the output and input circuits of said power supply; e. manually operable function switching means for selectively coupling the first and second input/output circuits of the regulating circuit, separately, to the first and second power input circuits and the first and second current input/output circuits of the test apparatus, in various combinations; f. manually adjustable means for setting the signal at the reference input to various levels; and g. a visual indicator for indicating current passing through said first and second input/output circuits of said current regulating circuit.
Claim 2
Dependent Claim
241 words
Current flow test apparatus comprising: a. first and second current input/output circuits for the test apparatus; b. first and second power input circuits for the test apparatus; c. an active current regulating circuit comprising a power supply input for receiving power therefor, first and second signal input/output circuits and a reference input, the regulating circuit having a D.C. isolation from the power input circuits and operative for regulating the level of current passing between the input/output circuits of the regulating circuit to a contant level corresponding to the level of the signal applied at said reference input; d. a power supply having first and second input circuits, respectively, connected to said first and second power input circuits for receiving power and an output circuit coupled to the power supply input of said regulating circuit, said power supply providing electrical power to said regulating circuit and comprising means for providing a D.C. isolation between the output and input circuits of said power supply; e. manually operable function switching means for selectively coupling the first and second input/output circuits of the regulating circuit, separately, to the first and second power input circuits and the first and second current input/output circuits of the test apparatus, in various combinations; f. manually adjustable means for setting the signal at the reference input to various levels; and g. a visual indicator for indicating current passing through said first and second input/output circuits of said current regulating circuit.
Claim 3
Dependent Claim
110 words
Current flow test apparatus according to claim 1 wherein said current regulating circuit comprises: a. controllable circuit having first and second input/output circuits coupled serially between the first and second input/output circuits of said regulating circuit and a control circuit, the controllable circuit being responsive to signals at its control circuit for regulating the amount of current passing between its first and second input/output circuits; and b. differential amplifier means having an output coupled to the control circuit and first and second input circuits one of which is coupled to one of the input/output circuits of said controllable circuit and the other of which is coupled to said reference input.
Claim 4
Dependent Claim
43 words
second switching means for coupling the first and second input/output circuits of said regulating circuit, respectively, to the first test terminal connector and to the first power terminal connector and for coupling the second test terminal to the second power terminal connector, and
Claim 5
Dependent Claim
43 words
second switching means for coupling the first and second input/output circuits of said regulating circuit, respectively, to the first test terminal connector and to the first power terminal connector and for coupling the second test terminal to the second power terminal connector, and
Claim 6
Dependent Claim
44 words
second switching means for coupling the first and second input/output circuits of said regulating circuit, respectively, to the first current input/output circuit and to the first power input circuit, and for coupling the second current input/output circuit to the second power input circuit, and
Claim 7
Dependent Claim
44 words
second switching means for coupling the first and second input/output circuits of said regulating circuit, respectively, to the first current input/output circuit and to the first power input circuit, and for coupling the second current input/output circuit to the second power input circuit, and
Claim 8
Dependent Claim
53 words
third switching means for coupling the first and second input/output circuits of said regulating circuit, respectively, to the first current input/output circuit and to the second current input/output circuit of the test apparatus; g. a visual indicator for indicating current passing through said first and second input/output circuits of said current regulating circuit.
Claim 9
Dependent Claim
53 words
third switching means for coupling the first and second input/output circuits of said regulating circuit, respectively, to the first current input/output circuit and to the second current input/output circuit of the test apparatus; g. a visual indicator for indicating current passing through said first and second input/output circuits of said current regulating circuit.
Claim 10
Dependent Claim
49 words
third switching means for coupling the first and second input/output circuits of said regulating circuit, respectively, to the first test terminal connector and to the second test terminal connector; g. a visual indicator for indicating current passing through said first and second input/output circuits of said current regulating circuit.
Claim 11
Dependent Claim
49 words
third switching means for coupling the first and second input/output circuits of said regulating circuit, respectively, to the first test terminal connector and to the second test terminal connector; g. a visual indicator for indicating current passing through said first and second input/output circuits of said current regulating circuit.
Claim 12
Dependent Claim
26 words
Current flow test apparatus according to claim 2 wherein said differential amplifier means has an input for receiving power coupled to said power supply output circuit.
Claim 13
Dependent Claim
29 words
Current flow test apparatus according to claim 1 wherein said manually adjustable means comprises at least one voltage divider circuit coupled across the output circuit of said power supply.
Claim 14
Dependent Claim
50 words
Current flow test apparatus According to claim 1 wherein said visual indicator has at least first and second input/output circuits for receiving signals to be indicated thereby and means for coupling the input/output circuits of the indicator into series circuit relation with said input-output circuits of said current regulating circuit.
Claim 15
Dependent Claim
41 words
Current flow test apparatus according to claim 5 wherein said coupling means for said indicator comprises a manually operable switch for selectively coupling the input/output circuits of said indicator into series circuit relation with said input/output circuits of said regulating circuit.
Claim 16
Dependent Claim
96 words
Current flow test apparatus according to claim 5 comprising: a. a first plurality of range resistor means for said regulating circuit; b. a second plurality of range resistor means for said indicator; and c. manually operable range switch means having a plurality of states, each state for coupling a selected one of the first resistor means in series circuit relation with the input/output circuits of both the regulating circuit and indicator, and each state for further coupling a selected one of the second resistor means in parallel circuit relation across the input/output circuits of the indicator.
Claim 17
Dependent Claim
168 words
Current flow test apparatus comprising: a. first and second current input/output circuits for the test apparatus; b. first and second power input circuits for the test apparatus; c. an active current regulating circuit comprising a power supply input for receiving power therefor, first and second signal input/output circuits and a reference input, the regulating circuit being responsive to the level of a signal at said reference input for regulating proportionately the level of current passing between the input/output circuits of the regulating circuit; d. manually adjustable means for setting the signal at the reference input to various levels; e. a power supply having first and second input circuits, respectively, connected to said first and second power input circuits for receiving power and an output circuit coupled to the power supply input of said regulating circuit, said power supply providing electrical power to said regulating circuit and comprising means for providing a D.C. isolation between the output and input circuits of said power supply; f. function switching means comprising
Claim 18
Dependent Claim
168 words
Current flow test apparatus comprising: a. first and second current input/output circuits for the test apparatus; b. first and second power input circuits for the test apparatus; c. an active current regulating circuit comprising a power supply input for receiving power therefor, first and second signal input/output circuits and a reference input, the regulating circuit being responsive to the level of a signal at said reference input for regulating proportionately the level of current passing between the input/output circuits of the regulating circuit; d. manually adjustable means for setting the signal at the reference input to various levels; e. a power supply having first and second input circuits, respectively, connected to said first and second power input circuits for receiving power and an output circuit coupled to the power supply input of said regulating circuit, said power supply providing electrical power to said regulating circuit and comprising means for providing a D.C. isolation between the output and input circuits of said power supply; f. function switching means comprising
Claim 19
Dependent Claim
111 words
Current flow test apparatus according to claim 8 wherein said current regulating circuit comprises: a. controllable circuit having first and second input/ output circuits coupled serially between the first and second input/output circuits of said regulating circuit and a control circuit, the controllable circuit being responsive to signals at its control circuit for regulating the amount of current passing between its first and second input/output circuits; and b. differential amplifier means having an output coupled to the control circuit and first and second input circuits one of which is coupled to one of the input/output circuIts of said controllable circuit and the other of which is coupled to said reference input.
Claim 20
Dependent Claim
26 words
Current flow test apparatus according to claim 9 wherein said differential amplifier means comprises an input for receiving power coupled to said power supply output circuit.
Claim 21
Dependent Claim
29 words
Current flow test apparatus according to claim 8 wherein said manually adjustable means comprises at least one voltage divider circuit coupled across the output circuit of said power supply.
Claim 22
Dependent Claim
50 words
Current flow test apparatus according to claim 8 wherein said visual indicator has at least first and second input/output circuits for receiving signals to be indicated thereby and means for coupling the input/output circuits of the indicator into series circuit relation with said input/output circuits of said current regulating circuit.
Claim 23
Dependent Claim
41 words
Current flow test apparatus according to claim 12 wherein said coupling means for said indicator comprises a manually operable switch for selectively coupling the input/output circuits of said indicator into series circuit relation with said input/output circuits of said regulating circuit.
Claim 24
Dependent Claim
96 words
Current flow test apparatus according to claim 12 comprising: a. a first plurality of range resistor means for said regulating circuit; b. a second plurality of range resistor means for said indicator; and c. manually operable range switch means having a plurality of states, each state for coupling a selected one of the first resistor means in series circuit relation with the input/output circuits of both the regulating circuit and indicator, and each state for further coupling a selected one of the second resistor means in parallel circuit relation across the input/output circuits of the indicator.
Claim 25
Dependent Claim
169 words
Current flow test apparatus comprising: a. a test connector having first and second test terminal connectors; b. a power connector having first and second power terminal connectors; c. an active current regulating circuit comprising a power supply input for receiving power therefor, first and second signal input/output circuits and a reference input, the regulating circuit being responsive to the level of a signal at said reference input for regulating proportionately the level of current passing between the input/output circuits of the regulating circuit; d. manually adjustable means for setting the signal at the reference input to various levels; e. power supply having first and second input circuits, respectively, connected to said first and second power terminal connectors for receiving power, and an output circuit coupled to the power supply input of said regulating circuit, said power supply providing electrical power to said regulating circuit and comprising means for providing a D.C. isolation between the output and input circuits of said power supply; f. manually operable function switching means comprising
Claim 26
Dependent Claim
169 words
Current flow test apparatus comprising: a. a test connector having first and second test terminal connectors; b. a power connector having first and second power terminal connectors; c. an active current regulating circuit comprising a power supply input for receiving power therefor, first and second signal input/output circuits and a reference input, the regulating circuit being responsive to the level of a signal at said reference input for regulating proportionately the level of current passing between the input/output circuits of the regulating circuit; d. manually adjustable means for setting the signal at the reference input to various levels; e. power supply having first and second input circuits, respectively, connected to said first and second power terminal connectors for receiving power, and an output circuit coupled to the power supply input of said regulating circuit, said power supply providing electrical power to said regulating circuit and comprising means for providing a D.C. isolation between the output and input circuits of said power supply; f. manually operable function switching means comprising
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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |