Patent US5797949A successfully refreshed from Google Patents.
US4380757A
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Data acquisition system and analog to digital converter therefor
Assignee: Emerson Process Management Power and Water Solutions Inc
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Filing: 1981-12-09
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Granted: 1983-04-19
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Expires: 2001-12-09
Abstract
Abstract From a plurality of parallel channels of communication, each including a voltage-to-frequency (V/F) converter, a central clock synchronously timed for each channel, the derivation of a train of pulses having a number of pulses representative of the magnitude of an analog signal inputted to the V/F converter. The central clock also times the multiplexing at the measuring point of either the analog input signal or a bias voltage for calibration or a voltage reference for scaling. The central processor receives the counts from each train of pulses, combines them and threats them to provide a corrected count in each channel separately. Clocking and pulsing are effected through an isolation transformer associated with each channel, to and from the central processor.
Inventors
- 👤 Gyorgy I. Vancsa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:24
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
212 words
A method of deriving through a channel of communication including an anlog-to-digital (A/D) converter, a corrected value C XC applicable to any count C X derived from said (A/D) converter through said channel of communication in relation to an analog input signal of magnitude V X applied from at least one measuring point, comprising the steps of: (1) applying a bias voltage V B at the input of said channel of communication and deriving a count C B at the output of said A/D converter; (2) applying a known voltage reference V REF at the input of said channel of communication and deriving a count C REF at the output of said A/D converter; (3) applying the analog input signal of magnitude V X of the measuring point and deriving a count C X at the output of said A/D converter; (4) computing C XC with the formula: ##EQU8## where "RES" is the Resolution C RES of measurement and "Range" is the spread of the input signal V X in magnitude; the deriving steps (1) and (2) of counts C B and C REF being refreshed from applied voltages V B and V REF from time to time before deriving counts C X and computing C XC under steps (3) and (4).
Claim 2
Independent Claim
212 words
A method of deriving through a channel of communication including an anlog-to-digital (A/D) converter, a corrected value C XC applicable to any count C X derived from said (A/D) converter through said channel of communication in relation to an analog input signal of magnitude V X applied from at least one measuring point, comprising the steps of: (1) applying a bias voltage V B at the input of said channel of communication and deriving a count C B at the output of said A/D converter; (2) applying a known voltage reference V REF at the input of said channel of communication and deriving a count C REF at the output of said A/D converter; (3) applying the analog input signal of magnitude V X of the measuring point and deriving a count C X at the output of said A/D converter; (4) computing C XC with the formula: ##EQU8## where "RES" is the Resolution C RES of measurement and "Range" is the spread of the input signal V X in magnitude; the deriving steps (1) and (2) of counts C B and C REF being refreshed from applied voltages V B and V REF from time to time before deriving counts C X and computing C XC under steps (3) and (4).
Claim 3
Dependent Claim
104 words
The method of claim 1 in which from applied voltages V B and V REF a value k i =(V B -V REF ) is ascertained, with the additional steps of: (5) applying a known maximum voltage V 2 as input signal corresponding to the Resolution C RES and deriving a count C RES 1 ; (6) adjusting k i by the ratio C RES /C RES 1 to obtain k i 1 ; (7) modifying RES/Range to become k=RES/Range×k i 1 , and performing the said steps (3) and (4) with the formula of step (4) as amended in computing C XC .
References Cited (Backward Citations)
US3027079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-18 | 1986-10-18 | 1987-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-18 | 1990-10-18 | 1991-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-18 | 1994-10-18 | 1995-04-19 | $7700.00 | Window Closed / Lapsed |