US3761812A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detecting anomalies in a meter movement
Assignee: Revvity Inc
•
Filing: 1972-06-12
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Granted: 1973-09-25
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Expires: 1992-06-12
Abstract
Abstract Method for detecting anomalies in the motion of the moving systems of electrical meters and similar devices including the steps of applying a ramp current to the meter movement to develop a ramp voltage across it and detecting perturbations in the ramp voltage. Embodiments of apparatus for practicing the method are also disclosed.
Inventors
- 👤 W Plake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:58
CPC Classifications
G; G01; G01R; G01R35/00; G01R35/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
A method of detecting anomalies in the motion of the moving system of an electrical meter or similar device, comprising: applying a ramp current to the device to produce a ramp voltage across it; and differentiating the ramp voltage to produce a DC voltage having a constant magnitude in the absence of anomalies in said motion and a DC voltage having perturbations in the presence of anomalies in said motion.
Claim 2
Independent Claim
70 words
A method of detecting anomalies in the motion of the moving system of an electrical meter or similar device, comprising: applying a ramp current to the device to produce a ramp voltage across it; and differentiating the ramp voltage to produce a DC voltage having a constant magnitude in the absence of anomalies in said motion and a DC voltage having perturbations in the presence of anomalies in said motion.
Claim 3
Dependent Claim
48 words
The method as in claim 1 further comprising the steps of: amplifying the differentiated ramp voltage; and differentiating the amplified differentiated ramp voltage to produce an output voltage having a zero level in the absence of anomalies and having perturbations in the presence of anomalies in said motion.
Claim 4
Independent Claim
82 words
A method of detecting anomalies in the motion of the moving system of an electrical meter or similar device, comprising: inserting the device as one arm of a Wheatstone bridge, the other arms being resistors; applying a ramp voltage to the bridge; and adjusting the values of the resistance arms to produce a null balance when the meter movement is locked, output voltage perturbations being then produced when the meter movement is unlocked and during the presence of anomalies in said motion.
Claim 5
Independent Claim
82 words
A method of detecting anomalies in the motion of the moving system of an electrical meter or similar device, comprising: inserting the device as one arm of a Wheatstone bridge, the other arms being resistors; applying a ramp voltage to the bridge; and adjusting the values of the resistance arms to produce a null balance when the meter movement is locked, output voltage perturbations being then produced when the meter movement is unlocked and during the presence of anomalies in said motion.
Claim 6
Dependent Claim
94 words
Apparatus for detecting anomalies in the motion of the moving system of an electrical meter of similar device, comprising: circuit means for generating and applying a ramp current to the device to produce a ramp voltage across the device; and means connected across the device for detecting perturbations in the ramp voltage comprising a differentiating circuit connected across the device to differentiate the ramp voltage producing a DC voltage of constant magnitude in the absence of anomalies in said motion and a DC voltage having perturbations in the presence of anomalies in said motion.
Claim 7
Dependent Claim
94 words
Apparatus for detecting anomalies in the motion of the moving system of an electrical meter of similar device, comprising: circuit means for generating and applying a ramp current to the device to produce a ramp voltage across the device; and means connected across the device for detecting perturbations in the ramp voltage comprising a differentiating circuit connected across the device to differentiate the ramp voltage producing a DC voltage of constant magnitude in the absence of anomalies in said motion and a DC voltage having perturbations in the presence of anomalies in said motion.
Claim 8
Dependent Claim
62 words
Apparatus as in claim 4 in which said detecting means further includes: an amplifier connected to the differentiating circuit for amplifying the DC voltage; and another differentiating circuit connected to the amplifier for differentiating the amplified DC voltage to produce an output voltage having a zero level in the absence of anomalies and perturbations in the presence of anomalies in said motion.
Claim 9
Dependent Claim
126 words
Apparatus for detecting anomalies in the motion of the moving system of an electrical meter or similar device, comprising: circuit means including a circuit for generating a ramp voltage and for applying it across a first resistor and the device connected in series at a first node; means for applying the ramp voltage across second and third resistors connected in series at a second node, the second resistor having a resistance equal in value to the resistance of the first resistor and the third resistor having a resistance equal in value to the resistance of the device when the moving system is locked in position; and means connected to detect perturbations in the voltage between the first and second nodes when the moving system is unlocked.
Claim 10
Dependent Claim
126 words
Apparatus for detecting anomalies in the motion of the moving system of an electrical meter or similar device, comprising: circuit means including a circuit for generating a ramp voltage and for applying it across a first resistor and the device connected in series at a first node; means for applying the ramp voltage across second and third resistors connected in series at a second node, the second resistor having a resistance equal in value to the resistance of the first resistor and the third resistor having a resistance equal in value to the resistance of the device when the moving system is locked in position; and means connected to detect perturbations in the voltage between the first and second nodes when the moving system is unlocked.
Claim 11
Dependent Claim
22 words
Apparatus as in claim 6 in which the perturbation detecting means comprises a differential amplifier connected between the first and second nodes.
References Cited (Backward Citations)
US2618686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |