US4337517A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of automatically calibrating a microprocessor controlled digital multimeter
Assignee: ST SYSTRON DONNER Corp
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Filing: 1979-10-22
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Granted: 1982-06-29
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Expires: 1999-10-22
Abstract
Abstract A new microprocessor controlled digital multimeter offers significant advantages to the user. Automatic calibration allows a new reference IC board to be inserted and because of such calibration the multimeter is instantly ready for use.
Inventors
- 👤 Walter Nickel
- 👤 Zoltan Tarczy-Hornoch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:15
CPC Classifications
G; G01; G01R; G01R35/00; G01R35/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A method for rapid calibration of a microprocessor controlled digital multimeter having a set of analog components which can produce measurement errors and a subset of said components which are substantially more precise and removable comprising the following steps: removing said subset of components; replacing said subset with a previously calibrated equivalent subset; and using said microprocessor and said equivalent subset to arithmetically remove the measurement errors caused by said set of analog components, wherein said arithmetical removal step is based on the precision of said previously calibrated equivalent subset.
Claim 2
Independent Claim
90 words
A method for rapid calibration of a microprocessor controlled digital multimeter having a set of analog components which can produce measurement errors and a subset of said components which are substantially more precise and removable comprising the following steps: removing said subset of components; replacing said subset with a previously calibrated equivalent subset; and using said microprocessor and said equivalent subset to arithmetically remove the measurement errors caused by said set of analog components, wherein said arithmetical removal step is based on the precision of said previously calibrated equivalent subset.
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) | 1985-06-28 | 1985-12-28 | 1986-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-28 | 1989-12-28 | 1990-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-28 | 1993-12-28 | 1994-06-29 | $7700.00 | Window Closed / Lapsed |