Patent US4564805A successfully refreshed from Google Patents.
US4564805A
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US
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Oscilloscope with integrated frequency counter and method of measuring frequency
Assignee: Sencore Inc
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Filing: 1984-08-29
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Granted: 1986-01-14
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Expires: 2004-08-29
Abstract
Abstract The sweep trigger pulses generated internally in an oscilloscope are coupled to a pulse counter, which counter is reset periodically and a number proportional to the count accumulated during each period is displayed.
Inventors
- 👤 Robert A. Winter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:23
CPC Classifications
G; G01; G01R; G01R23/00; G01R13/00; G01R13/20; G01R13/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
In an oscilloscope, the combination of a sweep trigger pulse generator for producing a train of trigger pulses in response to recurring conditions of an input signal applied thereto, said sweep trigger pulse generator including means for adjusting the polarity and level of the portion of said input signal with which said trigger pulses are synchronized, means responsive to said trigger pulses for synchronizing the sweep of said oscilloscope with said trigger pulses, frequency counter means for measuring the frequency at which pulses supplied to an input thereof occur, display means responsive to an output from said frequency counter for displaying a digital representation of said frequency, an auxiliary pulse generator for providing a train of auxiliary pulses in response to an input signal applied thereto, and switch means for selectively supplying either said train of trigger pulses or said train of auxiliary pulses to said input of said frequency counter means.
Claim 2
Dependent Claim
152 words
In an oscilloscope, the combination of a sweep trigger pulse generator for producing a train of trigger pulses in response to recurring conditions of an input signal applied thereto, said sweep trigger pulse generator including means for adjusting the polarity and level of the portion of said input signal with which said trigger pulses are synchronized, means responsive to said trigger pulses for synchronizing the sweep of said oscilloscope with said trigger pulses, frequency counter means for measuring the frequency at which pulses supplied to an input thereof occur, display means responsive to an output from said frequency counter for displaying a digital representation of said frequency, an auxiliary pulse generator for providing a train of auxiliary pulses in response to an input signal applied thereto, and switch means for selectively supplying either said train of trigger pulses or said train of auxiliary pulses to said input of said frequency counter means.
Claim 3
Dependent Claim
26 words
The combination according to claim 1 wherein said auxiliary pulse generator is responsive to preset level and slope polarity conditions of the input signal applied thereto.
Claim 4
Dependent Claim
45 words
The combination according to claim 2 wherein said oscilloscope comprises first and second input terminals, and manual selector switch means for coupling one of said input terminals to said sweep trigger pulse generator and the other of said input terminals to said auxiliary pulse generator.
Claim 5
Dependent Claim
28 words
The combination according to claim 1 comprising in combination means for displaying the waveform of said portion of said input signal with which said trigger pulses are synchronized.
Claim 6
Independent Claim
119 words
A method of measuring the frequency of a cyclical recurring portion of the waveform of an input signal, comprising the steps of applying said input signal to a first input of a trigger pulse generator having adjustable slope and polarity controls, synchronizing the display on an oscilloscope with said trigger pulses generated by said trigger pulse generator, adjusting said controls while observing the waveform of said input signal on said oscilloscope to select the portion of said input signal in synchronism with which said generator generates said trigger pulses, applying said trigger pulses to a frequency counter to measure the frequency of said trigger pulses, and displaying a digital representation of the frequency at which said trigger pulses occur.
Claim 7
Independent Claim
119 words
A method of measuring the frequency of a cyclical recurring portion of the waveform of an input signal, comprising the steps of applying said input signal to a first input of a trigger pulse generator having adjustable slope and polarity controls, synchronizing the display on an oscilloscope with said trigger pulses generated by said trigger pulse generator, adjusting said controls while observing the waveform of said input signal on said oscilloscope to select the portion of said input signal in synchronism with which said generator generates said trigger pulses, applying said trigger pulses to a frequency counter to measure the frequency of said trigger pulses, and displaying a digital representation of the frequency at which said trigger pulses occur.
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) | 1989-01-13 | 1989-07-15 | 1990-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-13 | 1993-07-15 | 1994-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-13 | 1997-07-15 | 1998-01-14 | $7700.00 | Window Closed / Lapsed |