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US3706904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sweep hold-off circuit
Assignee: HP Inc
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Filing: 1970-06-10
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Granted: 1972-12-19
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Expires: 1990-06-10
Abstract
Abstract A circuit for use with an oscilloscope sweep circuit includes an integrator for producing a control signal that establishes a substantially fixed hold-off time between the arming and triggering of the sweep as a function of the deviation from a reference value of the time between the arming and triggering of the sweep circuit.
Inventors
- 👤 William J Mordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:22
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/32
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
245 words
In a cathode-ray oscilloscope having signal display means including horizontal and vertical deflection systems, a sweep circuit for the horizontal deflection system comprising: a sweep generator connected to the horizontal deflection system for applying sweep signal thereto in response to a sweep initiating signal applied thereto; sweep triggering means having an arming input and an applied signal input and being operable in first and second operating states, said sweep triggering means being connected to apply sweep initiating signal to said sweep generator upon transition from the first operating state to the second operating state in response to an applied signal and being disposed to be reset to the first operating state in response to an arming signal applied thereto; sweep hold-off means responsive to termination of sweep signal from said sweep generator for applying arming signal to said sweep triggering means for a hold-off period after said termination that is related to a control signal applied thereto; reference generating means producing a reference signal representative of a preselected sweep hold-off period; first means responsive to the time interval between resetting of said sweep triggering means and the transition thereof from the first to the second operating states in response to applied signal for producing a variable signal representative of said time interval; and second means connected to receive said reference and variable signals for applying control signal to said sweep hold-off means to alter said hold-off period with respect to said preselected sweep hold-off period.
Claim 2
Dependent Claim
245 words
In a cathode-ray oscilloscope having signal display means including horizontal and vertical deflection systems, a sweep circuit for the horizontal deflection system comprising: a sweep generator connected to the horizontal deflection system for applying sweep signal thereto in response to a sweep initiating signal applied thereto; sweep triggering means having an arming input and an applied signal input and being operable in first and second operating states, said sweep triggering means being connected to apply sweep initiating signal to said sweep generator upon transition from the first operating state to the second operating state in response to an applied signal and being disposed to be reset to the first operating state in response to an arming signal applied thereto; sweep hold-off means responsive to termination of sweep signal from said sweep generator for applying arming signal to said sweep triggering means for a hold-off period after said termination that is related to a control signal applied thereto; reference generating means producing a reference signal representative of a preselected sweep hold-off period; first means responsive to the time interval between resetting of said sweep triggering means and the transition thereof from the first to the second operating states in response to applied signal for producing a variable signal representative of said time interval; and second means connected to receive said reference and variable signals for applying control signal to said sweep hold-off means to alter said hold-off period with respect to said preselected sweep hold-off period.
Claim 3
Dependent Claim
50 words
A sweep circuit as in claim 1 wherein said second means includes capacitive storage means connected to store a selected quantity of charge per sweep signal, and a discharge circuit for discharging the stored charge in the capacitive storage means at a controllable rate, in response to said variable signal.
Claim 4
Dependent Claim
92 words
A sweep circuit as in claim 1 wherein: said reference generating means responds to each sweep initiating signal to produce a reference pulse having a predetermined pulse width; said first means responsive to the time interval includes gating means connected to receive said sweep initiating signal and a signal representative of no arming signal applied to said sweep triggering means for producing said variable signal; and said second means applies to said sweep hold-off means the control signal which is indicative of the combination of said reference pulses and said variable signal.
Claim 5
Dependent Claim
140 words
A sweep circuit as in claim 3 wherein said second means includes first and second capacitive storage means, the first capacitive storage means being connected to apply to said sweep hold-off means the control signal which is representative of the amount of charge stored by said first capacitive storage means; third means connected to said first capacitive storage means for supplying a selected amount of charge thereto per sweep signal; a controllable current source connected to said first capacitive storage means for discharging the charge stored thereby at a rate controlled by a hold-off control signal applied thereto; and fourth means including said second capacitive storage means connected to receive said reference pulses and said variable signal for applying to said current source a hold-off control signal indicative of the time relationship between said reference pulses and said variable signal.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |