US3774107A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for shunting select signals across an unknown impedance and blocking said signals from a measuring system
Assignee: Anritsu Co
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Filing: 1972-03-17
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Granted: 1973-11-20
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Expires: 1992-03-17
Abstract
Abstract An impedance measuring system with a reference impedance including a network for delivering or absorbing current to or from the impedance being measured. The system uses a second network to cancel the measurement inaccuracy otherwise introduced by the first network.
Inventors
- 👤 D Dunwoodie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:00
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R17/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
An impedance measuring system with a reference impedance and with an output signal sensor responsive to an unknown impedance in relation to the reference impedance, in combination with means for shunting select signals across the unknown impedance and blocking the signals from the measuring system said means including: a first network means connected between the measuring system and the unknown impedance for providing a frequency selective path in shunt with the unknown impedance, and, a second network means connected between the measuring system and the reference impedance for cancelling the effect of the presence of the first network means in measuring the unknown impedance.
Claim 2
Dependent Claim
104 words
An impedance measuring system with a reference impedance and with an output signal sensor responsive to an unknown impedance in relation to the reference impedance, in combination with means for shunting select signals across the unknown impedance and blocking the signals from the measuring system said means including: a first network means connected between the measuring system and the unknown impedance for providing a frequency selective path in shunt with the unknown impedance, and, a second network means connected between the measuring system and the reference impedance for cancelling the effect of the presence of the first network means in measuring the unknown impedance.
Claim 3
Dependent Claim
39 words
An impedance measuring system as described in claim 1 wherein said system is responsive to a.c. signals and said means for shunting select signals shunts d.c. signals across the unknown impedance and blocks d.c. signals from the measuring system.
Claim 4
Dependent Claim
24 words
An impedance measuring system as described in claim 1 wherein said first network means includes means foR injecting select signals to said unknown impedance.
Claim 5
Dependent Claim
112 words
An impedance measuring system having a bridge circuit including an unknown impedance and a reference impedance, and having an output signal sensor responsive to the unknown impedance in relation to the reference impedance, in combination with means for shunting select signals across the unknown impedance and blocking the signals from the measuring system said means including: a first network means connected between the measuring system and the unknown impedance for providing a frequency selective path in shunt with the unknown impedance, and, a second network means connected between the measuring system and the reference impedance for cancelling the effect of the presence of the first network means in measuring the unknown impedance.
Claim 6
Dependent Claim
112 words
An impedance measuring system having a bridge circuit including an unknown impedance and a reference impedance, and having an output signal sensor responsive to the unknown impedance in relation to the reference impedance, in combination with means for shunting select signals across the unknown impedance and blocking the signals from the measuring system said means including: a first network means connected between the measuring system and the unknown impedance for providing a frequency selective path in shunt with the unknown impedance, and, a second network means connected between the measuring system and the reference impedance for cancelling the effect of the presence of the first network means in measuring the unknown impedance.
Claim 7
Dependent Claim
39 words
An impedance measuring system as described in claim 4 wherein said system is responsive to a.c. signals and said means for shunting select signals shunts d.c. signals across the unknown impedance and blocks d.c. signals from the measuring system.
Claim 8
Dependent Claim
24 words
An impedance measuring system as described in claim 5 wherein said first network means includes means for injecting select signals to said unknown impedance.
Claim 9
Dependent Claim
102 words
In an impedance measuring bridge circuit with a reference impedance for measuring an unknown impedance by relation to the reference impedance, a method of measuring the impedance of an unknown impedance which concurrently has select signals applied thereto comprising the steps of: first, shunting the select signals across the unknown impedance and blocking the select signals from the measuring bridge by a first circuit network arranged between the unknown impedance and the impedance measuring bridge; and second, compensating for the presence of the first circuit network by a complementary second circuit network arranged between the reference impedance and the impedance measuring bridge.
Claim 10
Dependent Claim
102 words
In an impedance measuring bridge circuit with a reference impedance for measuring an unknown impedance by relation to the reference impedance, a method of measuring the impedance of an unknown impedance which concurrently has select signals applied thereto comprising the steps of: first, shunting the select signals across the unknown impedance and blocking the select signals from the measuring bridge by a first circuit network arranged between the unknown impedance and the impedance measuring bridge; and second, compensating for the presence of the first circuit network by a complementary second circuit network arranged between the reference impedance and the impedance measuring bridge.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |