US4240149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring system
Assignee: Leeds and Northrup Co
•
Filing: 1979-02-16
•
Granted: 1980-12-16
•
Expires: 1999-02-16
Abstract
Abstract There is provided a method for measuring a parameter whose value is calculable as an integral with time of a function of at least one variable so as to make possible the use of a microprocessor when measurements of such variables are desired. The variable is sampled periodically at a frequency asynchronous with the wave form which the variable follows and then there is periodically calculated the value of the function by summing the values for the function determined by the samples taken during the time between the calculations, thus determining the desired integral.
Inventors
- 👤 David L. Fletcher
- 👤 Walter O. Stadlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:33
CPC Classifications
G; G01; G01R; G01R19/00; G01R19/02; G01R21/00; G01R21/133
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
The method for measuring a parameter whose value is calculable as the integral with time of a function of at least one variable which has a value following a periodic wave form, comprising the steps of: sampling the value of said variable periodically at a frequency asynchronous with said wave form; and periodically calculating the value of the integral of the function in accordance with the sum of the values for the function determined in accordance with the values of all of the samples taken during the time between said calculations.
Claim 2
Independent Claim
91 words
The method for measuring a parameter whose value is calculable as the integral with time of a function of at least one variable which has a value following a periodic wave form, comprising the steps of: sampling the value of said variable periodically at a frequency asynchronous with said wave form; and periodically calculating the value of the integral of the function in accordance with the sum of the values for the function determined in accordance with the values of all of the samples taken during the time between said calculations.
Claim 3
Dependent Claim
34 words
The method set forth in claim 1 in which the parameter is RMS voltage, the variable is the instantaneous voltage e for each sample, and the function of the variable is e 2 .
Claim 4
Dependent Claim
34 words
The method set forth in claim 1 in which the parameter is RMS current, the variable is the instantaneous current i for each sample, and the function of the variable is i 2 .
Claim 5
Dependent Claim
31 words
The method set forth in claim 1 in which the parameter is average power, the variables are e and i for each sample, and the function of the variables is ei.
Claim 6
Dependent Claim
34 words
The method set forth in claim 1 in which the parameter is energy for a period T, the variables are e and i for each sample, and the function of those variables is ei.
References Cited (Backward Citations)
US4139896A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |