US3609543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Meter system with continuously variable range having zero and full scale calibration features
Assignee: HY CAL ENGINEERING
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Filing: 1969-06-02
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Granted: 1971-09-28
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Expires: 1989-06-02
Abstract
Abstract A meter system is disclosed incorporating a thermally insulated DC amplifier the operation of which is controlled by variable gain and trim resistors. The system also incorporates a calibration circuit for providing variable voltages in accordance with the setting of a potentiometer. The potentiometer of the calibration circuit and the variable gain resistor are ganged together to simplify calibration of the operating range for input signals applied to the amplifier, the output of which is in turn applied to a meter movement having substantial angular range. Various accessory package circuits are also disclosed for use in conjunction with the basic metering system to increase the utilization of the system.
Inventors
- 👤 Raymond A Whitmore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:09
CPC Classifications
G; G01; G01R; G01R1/00; G01R1/28
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
213 words
A direct-current-metering system for manifesting the amplitude of an applied signal, comprising: input means for receiving said applied signal; a calibration means, including a potentiometer, for providing a variable-calibration signal; ground terminal means connected to ground potential; a DC operational amplifier including a variable-resistance gain control means for varying the output of said amplifier; an input-switching means for said operational amplifier for selectively coupling said operational amplifier to exclusively receive, said applied signal from said input means, said calibration signal from said calibration means and said ground potential from said ground terminal means; a calibration adjustment means coupled mutually to, said potentiometer of said calibration means and said variableresistance gain control means of said operational amplifier to vary The gain of said operational amplifier concurrently with the amplitude of said calibration signal; a meter movement means coupled to the output of said operational amplifier; variable feedback resistor means in a feedback loop of said operational amplifier for adjusting full scale deflection of the meter movement when the source of calibration signal is applied to the input of the operational amplifier; and additional variable resistor means for adjusting the bias applied to the operational amplifier when the input of the operational amplifier is grounded to provide for zero deflection adjustment of the meter movement.
Claim 2
Dependent Claim
213 words
A direct-current-metering system for manifesting the amplitude of an applied signal, comprising: input means for receiving said applied signal; a calibration means, including a potentiometer, for providing a variable-calibration signal; ground terminal means connected to ground potential; a DC operational amplifier including a variable-resistance gain control means for varying the output of said amplifier; an input-switching means for said operational amplifier for selectively coupling said operational amplifier to exclusively receive, said applied signal from said input means, said calibration signal from said calibration means and said ground potential from said ground terminal means; a calibration adjustment means coupled mutually to, said potentiometer of said calibration means and said variableresistance gain control means of said operational amplifier to vary The gain of said operational amplifier concurrently with the amplitude of said calibration signal; a meter movement means coupled to the output of said operational amplifier; variable feedback resistor means in a feedback loop of said operational amplifier for adjusting full scale deflection of the meter movement when the source of calibration signal is applied to the input of the operational amplifier; and additional variable resistor means for adjusting the bias applied to the operational amplifier when the input of the operational amplifier is grounded to provide for zero deflection adjustment of the meter movement.
Claim 3
Dependent Claim
19 words
A direct-current-metering system in accordance with claim 1 wherein said variable feedback resistor means comprises a manual adjustment means.
Claim 4
Dependent Claim
33 words
A direct-current-metering system in accordance with claim 1 for use in association with various accessory packages, including receptacle terminal means for receiving said accessory packages to modify the input to said input means.
Claim 5
Dependent Claim
30 words
A metering system in accordance with claim 1 wherein said calibration adjustment means includes a dial for setting said potentiometer and said variable-resistance gain control means to a preselected value.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |