US4034291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic measuring instrument combining an oscilloscope and a digital multimeter
Assignee: Tektronix Inc
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Filing: 1975-04-14
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Granted: 1977-07-05
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Expires: 1995-04-14
Abstract
Abstract An oscilloscope and a digital multimeter are combined in a single housing to provide a portable electronic measurement instrument wherein a substantial portion of circuitry is common to both measurement systems. A cathode-ray tube provides the display for both waveform and alpha-numeric information.
Inventors
- 👤 David William Allen
- 👤 Marshall Bond Borchert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:34
CPC Classifications
G; G01; G01R; G01R15/00; G01R15/08; G01R13/00; G01R13/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
84 words
A portable electronic measuring instrument, comprising: input circuit means including preprocessing means for converting a plurality of input signals of different measurement quantities to voltage signals; analog processing means for receiving said voltage signals and producing an analog waveform signal therefrom; digital processing means for receiving said voltage signals and producing numerical values thereof, said digital processing means including a Gm conversion unit, an RMS conversion circuit, and an A-D converter; and display means for selectively displaying said analog waveforms and said numerical values.
Claim 2
Dependent Claim
84 words
A portable electronic measuring instrument, comprising: input circuit means including preprocessing means for converting a plurality of input signals of different measurement quantities to voltage signals; analog processing means for receiving said voltage signals and producing an analog waveform signal therefrom; digital processing means for receiving said voltage signals and producing numerical values thereof, said digital processing means including a Gm conversion unit, an RMS conversion circuit, and an A-D converter; and display means for selectively displaying said analog waveforms and said numerical values.
Claim 3
Dependent Claim
32 words
The instrument according to claim 1 wherein said input circuit means includes at least one amplification stage for providing a buffer between said preprocessing means and said analog and digital processing means.
Claim 4
Dependent Claim
23 words
The instrument according to claim 1 wherein said preprocessing means includes means for scaling said input signals to within a predetermined amplitude range.
Claim 5
Dependent Claim
18 words
The instrument according to claim 1 wherein said digital processing means further includes an alpha-numeric character generator circuit.
Claim 6
Dependent Claim
112 words
A portable measuring instrument including an oscilloscope and a digital multimeter, comprising: input circuit means for receiving voltage and current signals, said input circuit means including means for converting said current signals to voltage signals; analog processing means including a vertical amplifier channel and a sweep generator connectable to said input circuit means for receiving said voltage signals and generating analog waveforms therefrom; digital processing means including an A-D converter and an alpha-numeric character generator connectable to said input circuit means for receiving said voltage signals and generating characters corresponding to the numerical values thereof; and display means including a cathode-ray tube for selectively displaying said analog waveforms and said alpha-numeric characters.
Claim 7
Dependent Claim
112 words
A portable measuring instrument including an oscilloscope and a digital multimeter, comprising: input circuit means for receiving voltage and current signals, said input circuit means including means for converting said current signals to voltage signals; analog processing means including a vertical amplifier channel and a sweep generator connectable to said input circuit means for receiving said voltage signals and generating analog waveforms therefrom; digital processing means including an A-D converter and an alpha-numeric character generator connectable to said input circuit means for receiving said voltage signals and generating characters corresponding to the numerical values thereof; and display means including a cathode-ray tube for selectively displaying said analog waveforms and said alpha-numeric characters.
Claim 8
Dependent Claim
27 words
The instrument according to claim 5 wherein said input means includes impedance elements and at least one amplification stage for determining the amplitude range of said instrument.
Claim 9
Dependent Claim
25 words
The instrument according to claim 5 wherein said input means includes current generator means for producing a predetermined output current to a resistance being measured.
Claim 10
Dependent Claim
22 words
The instrument according to claim 5 wherein said digital processing means further includes a Gm conversion circuit and an RMS conversion circuit.
References Cited (Backward Citations)
US3816815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |