Patent US4195252A successfully refreshed from Google Patents.
US4195252A
Expired / Lapsed
US
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Zero delay trigger view
Assignee: Tektronix Inc
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Filing: 1978-11-16
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Granted: 1980-03-25
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Expires: 1998-11-16
Abstract
Abstract An apparent zero delay of a trigger view signal with respect to a normal vertical signal in an oscilloscope is provided by horizontally shifting the trigger view display to coincide with the normal vertical display. This is achieved by injecting a predetermined offset current into the sweep sawtooth output amplifier only when the trigger view signal is being displayed.
Inventors
- 👤 Ronald W. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:25
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/32; G01R13/24
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
In an oscillographic device having vertical and horizontal deflection systems, a circuit for providing an apparent time shift of a preselected waveform display, comprising: a sweep generator for generating a sweep sawtooth signal the width of which is substantially coincident with the time interval of said waveform display; means for generating a gate signal the gate width of which is substantially coincident with the time interval of said waveform display; means coupled to said gate signal generating means for generating a predetermined offset current during the time interval that said gate signal is generated; means for combining said sweep sawtooth signal and said offset current to produce a sawtooth voltage the level of which is shifted by a predetermined level; and means for coupling said sawtooth voltage to said horizontal deflection system.
Claim 2
Dependent Claim
132 words
In an oscillographic device having vertical and horizontal deflection systems, a circuit for providing an apparent time shift of a preselected waveform display, comprising: a sweep generator for generating a sweep sawtooth signal the width of which is substantially coincident with the time interval of said waveform display; means for generating a gate signal the gate width of which is substantially coincident with the time interval of said waveform display; means coupled to said gate signal generating means for generating a predetermined offset current during the time interval that said gate signal is generated; means for combining said sweep sawtooth signal and said offset current to produce a sawtooth voltage the level of which is shifted by a predetermined level; and means for coupling said sawtooth voltage to said horizontal deflection system.
Claim 3
Dependent Claim
20 words
A circuit in accordance with claim 1 wherein said offset current generating means includes a plurality of selectable current sources.
Claim 4
Dependent Claim
40 words
A circuit in accordance with claim 2 wherein said sweep generator includes sweep rate selecting means, said sweep rate selecting means also selecting said selectable current sources to provide the same apparent time shift for a plurality of sweep rates.
Claim 5
Dependent Claim
117 words
In an oscilloscope having at least a first and a second amplifier channel associated with the vertical deflection system thereof, a circuit for providing apparent time coincidence of display signals processed by both said amplifier channels wherein said second amplifier has a longer signal path than said first amplifier channel, comprising: means for generating sweep sawtooth signals to provide horizontal deflection of said display signals; offset current generating means for selectively generating predetermined offset current only during the display of signals processed by said second amplifier channel; and means for combining said offset current with ones of said sawtooth signals to provide a horizontal deflection sawtooth signal the level of which is shifted by a predetermined amount.
Claim 6
Dependent Claim
117 words
In an oscilloscope having at least a first and a second amplifier channel associated with the vertical deflection system thereof, a circuit for providing apparent time coincidence of display signals processed by both said amplifier channels wherein said second amplifier has a longer signal path than said first amplifier channel, comprising: means for generating sweep sawtooth signals to provide horizontal deflection of said display signals; offset current generating means for selectively generating predetermined offset current only during the display of signals processed by said second amplifier channel; and means for combining said offset current with ones of said sawtooth signals to provide a horizontal deflection sawtooth signal the level of which is shifted by a predetermined amount.
Claim 7
Dependent Claim
34 words
A circuit in accordance with claim 4 wherein said offset current generating means includes at least one current source which is rendered operable at a predetermined selectable sweep rate of said sweep generating means.
Claim 8
Dependent Claim
57 words
A circuit in accordance with claim 4 further including a display logic unit for providing control signals to selectively display signals processed by said first and second amplifier channels, said display logic unit further providing a control signal to enable said offset current generating means coincident with the display of signals processed by said second amplifier channel.
Claim 9
Dependent Claim
43 words
A circuit in accordance with claim 6 wherein said sweep generating means includes first and second sweep generators, and display logic unit further provides a control signal to select a horizontal deflection sawtooth signal from either of said first and second sweep generators.
References Cited (Backward Citations)
US3795834A
Cited
US3971011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |