US3909671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sampling oscilloscope having means for magnifying a part of an observed wave form along the time base
Assignee: Individual
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Filing: 1973-11-16
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Granted: 1975-09-30
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Expires: 1993-11-16
Abstract
Abstract A sampling oscilloscope is known, in which a delayed pulse generator is provided to generate delayed pulses successively delayed, by regulatable times, with respect to the period of a synchronous signal by comparison between respective instantaneous levels of a high-speed saw-tooth wave synchronized with the synchronous signal and of a sweep voltage of a cathode-ray tube, and in which a sampled output of an input signal sampled by the delayed pulses is displayed on the screen of a cathode-ray tube by the use of the sweep voltage. In accordance with the principle of this invention, an attenuation circuit is provided before the delayed pulse generator to further attenuate the sweep voltage; a mode switch is provided for switching, for the delayed pulse generator, two paths of the sweep voltage in one of which the attenuation circuit is provided; and the mode switch is switched by a switch controller in response to a switching signal.
Inventors
- 👤 Naohisa Nakaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:03
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/34
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
324 words
A sampling oscilloscope, compriSing: a cathode-ray tube display assembly having horizontal sweep means for changing the horizontal position of a displayed waveform in response to external signals applied thereto and vertical shift means for changing the vertical position of a displayed waveform in response to external signals applied thereto; a sweep oscillator connected to said horizontal sweep means of the cathode-ray tube display assembly for generating a sweep voltage signal; synchronous means for generating synchronous pulses having a controllable constant period; variable attenuation means connected to the output of the sweep oscillator for attenuating the sweep voltage, said variable attenuation means comprising means responsive to control signals for controlling the attenuation of said variable attenuation means in response to said control signals; a delayed pulse generator connected to the output of said variable attenuation means and said synchronous means and including means for generating a high-speed saw-tooth wave in synchronism with said synchronous pulses and means for comparing respective instantaneous levels of said high-speed saw-tooth wave with the output of the variable attenuation means and for generating a pulse each time the compared instantaneous levels of the high-speed saw-tooth wave and the output of said variable attenuation means are equal; input means for receiving an input signal; first sampling means connected to said input means and said delay pulse generator for sampling the input signal in response to the pulses developed by said delay pulse generator to produce a first converted signal, which has a frequency lower than the frequency of the input signal and a waveform similar to the waveform of the input signal; means for applying said first converted signal to said vertical shift means of the cathode-ray tube display assembly; switch signal means for generating a switching signal; and switch control means connected to said means responsive to control signals and said switch signal means for automatically varying the attenuation of said variable attenuation means in response to said switching signal.
Claim 2
Dependent Claim
324 words
A sampling oscilloscope, compriSing: a cathode-ray tube display assembly having horizontal sweep means for changing the horizontal position of a displayed waveform in response to external signals applied thereto and vertical shift means for changing the vertical position of a displayed waveform in response to external signals applied thereto; a sweep oscillator connected to said horizontal sweep means of the cathode-ray tube display assembly for generating a sweep voltage signal; synchronous means for generating synchronous pulses having a controllable constant period; variable attenuation means connected to the output of the sweep oscillator for attenuating the sweep voltage, said variable attenuation means comprising means responsive to control signals for controlling the attenuation of said variable attenuation means in response to said control signals; a delayed pulse generator connected to the output of said variable attenuation means and said synchronous means and including means for generating a high-speed saw-tooth wave in synchronism with said synchronous pulses and means for comparing respective instantaneous levels of said high-speed saw-tooth wave with the output of the variable attenuation means and for generating a pulse each time the compared instantaneous levels of the high-speed saw-tooth wave and the output of said variable attenuation means are equal; input means for receiving an input signal; first sampling means connected to said input means and said delay pulse generator for sampling the input signal in response to the pulses developed by said delay pulse generator to produce a first converted signal, which has a frequency lower than the frequency of the input signal and a waveform similar to the waveform of the input signal; means for applying said first converted signal to said vertical shift means of the cathode-ray tube display assembly; switch signal means for generating a switching signal; and switch control means connected to said means responsive to control signals and said switch signal means for automatically varying the attenuation of said variable attenuation means in response to said switching signal.
Claim 3
Dependent Claim
38 words
A sampling oscilloscope according to claim 1, further comprising means for generating an unblanking signal in synchronism with the sweep voltage and in which said switch signal means comprises a count-down circuit for counting down the unblanking signal.
Claim 4
Dependent Claim
94 words
A sampling oscilloscope according to claim 1, further comprising second input means for receiving another input signal, second sampling means connected to said second input means and said delay pulse generator to produce a second converted signal of another input signal in response to the pulses developed by said delay pulse generator and second switch means connected to said first sampling means, said second sampling means and said switch signal means for alternately applying said first converted signal and said second converted signal to said vertical shift means in response to said switching signal.
Claim 5
Dependent Claim
53 words
A sampling oscilloscope according to claim 1, further comprising means connected to the cathode-ray tube display assembly and said switch signal means for applying said switching signal to the cathode-ray tube assembly to control the brightness of the beam of the cathode-ray tube assembly in accordance with the pattern of the switching signal.
Claim 6
Dependent Claim
44 words
A sampling oscilloscope according to claim 1, further comprising means connected to the cathode-ray tube display assembly and said switch signal means for shifting the vertical position of the beam of said cathode-ray tube assembly in accordance with the pattern of said switching signal.
Claim 7
Dependent Claim
316 words
In a sampling oscilloscope for magnifying a selected portion of an observable input signal waveform along the time base comprising; sampling means receptive of an input signal having a given waveform and responsive to sampling pulses applied thereto for sampling voltage levels of said input signal and for developIng sampled output signals proportional to respective ones of said voltage levels and having a waveform substantially similar to that of said input signal; a sweep oscillator for generating sweep signals; display means responsive to said sampled output signals and said sweep signals for displaying the waveform of said sampled output signals; means receptive of said sweep signals for selecting and magnifying a portion of the waveform including first variable attenuating means for controlling the sweep frequency of the displayed waveform to observe a portion thereof thereby defining a first stage of attenuation, means for selecting one portion of the observable waveform which is to be magnified, and second variable attenuating means for controlling magnification of the selected one portion of the observable waveform thereby defining a second state stage of attenuation; automatic switching means selectively receptive of the first attenuated sweep signal after said first stage and the second attenuated sweep signal after both stages and responsive to a switching signal applied thereto for selectively commutating between the two attenuated sweep signals and for selecting one of said two attenuated sweep signals; and delayed pulse generator means responsive to synchronous pulses synchronous with said input signal and receptive of the selected one of said two attenuated sweep signals from said switching means for generating sampling pulses at selectively spaced time intervals from each synchronous pulse for each sweep signal; whereby said display means displays said selected one portion of said observable waveform whenever said first attenuated sweep signal is selected and displays the magnification of said selected one portion whenever said second attenuated sweep signal is selected.
Claim 8
Dependent Claim
316 words
In a sampling oscilloscope for magnifying a selected portion of an observable input signal waveform along the time base comprising; sampling means receptive of an input signal having a given waveform and responsive to sampling pulses applied thereto for sampling voltage levels of said input signal and for developIng sampled output signals proportional to respective ones of said voltage levels and having a waveform substantially similar to that of said input signal; a sweep oscillator for generating sweep signals; display means responsive to said sampled output signals and said sweep signals for displaying the waveform of said sampled output signals; means receptive of said sweep signals for selecting and magnifying a portion of the waveform including first variable attenuating means for controlling the sweep frequency of the displayed waveform to observe a portion thereof thereby defining a first stage of attenuation, means for selecting one portion of the observable waveform which is to be magnified, and second variable attenuating means for controlling magnification of the selected one portion of the observable waveform thereby defining a second state stage of attenuation; automatic switching means selectively receptive of the first attenuated sweep signal after said first stage and the second attenuated sweep signal after both stages and responsive to a switching signal applied thereto for selectively commutating between the two attenuated sweep signals and for selecting one of said two attenuated sweep signals; and delayed pulse generator means responsive to synchronous pulses synchronous with said input signal and receptive of the selected one of said two attenuated sweep signals from said switching means for generating sampling pulses at selectively spaced time intervals from each synchronous pulse for each sweep signal; whereby said display means displays said selected one portion of said observable waveform whenever said first attenuated sweep signal is selected and displays the magnification of said selected one portion whenever said second attenuated sweep signal is selected.
Claim 9
Dependent Claim
28 words
In a sampling oscilloscope according to claim 6, further comprising means for generating said switching signal synchronous with a integral fraction of the frequency of said sweep signals.
Claim 10
Dependent Claim
37 words
In a sampling oscilloscope according to claim 6, wherein said display means comprises means responsive to said switching signal for changing the brightness of one displayed waveform thereby better distinguishing said one waveform from the other waveform.
Claim 11
Dependent Claim
38 words
In a sampling oscilloscope according to claim 6, wherein said display means comprises means responsive to said switching signal for changing the vertical position of one displayed waveform thereby better distinguishing said one waveform from the other waveform.
Claim 12
Dependent Claim
131 words
In a sampling oscilloscope according to claim 6, further comprising second sampling means receptive of a second input signal having a given waveform and responsive to said sampling pulses for sampling voltage levels of said second input signal and for developing second sampled output signals proportional to respective ones of said voltage levels and having a waveform substantially similar to that of said second input signal; second switching means selectively receptive of said first-mentioned sampled output signals and said second sampled output signals and responsive to said switching signal applied thereto for selectively commutating between the two sampled output signals and for selecting the corresponding sampled output signal; and wherein said display means comprises means receptive of said output of said second switching means for simultaneously displaying both sampled output waveforms.
References Cited (Backward Citations)
US3423629A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |