US4755887A
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Triggering for waveform recording
Assignee: HP Inc
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Filing: 1986-10-31
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Granted: 1988-07-05
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Expires: 2006-10-31
Abstract
Abstract A drop out trigger captures waveform data when a normally continuous input signal is disrupted or interrupted. In the preferred embodiment, a conventional trigger detects a parameter periodically satisfied by the continuous signal and resets a timer whenever a trigger event occurs. The alarm count of the timer is set for an interval slightly larger than the periodic interval. If the timer reaches the alarm count, a measurement signal is generated.
Inventors
- 👤 Phillip E. Deaver
- 👤 Stephen K. Will
- 👤 Steven C. Bird
- 👤 Mark S. Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:45
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/32; G11; G11B; G11B20/00; G11B20/02; G11B20/025; G11B20/10; G11B20/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
98 words
A triggering circuit responsive to the disruption of a normally continuous input signal to produce a measurement signal output, comprising: timer means having an adjustable alarm count and a reset input, producing a measurement signal output if the alarm count is reached; control means for programming the alarm count of the timer means at a value larger than the periodic interval at which the continuous input signal satisfies a predetermined condition; means responsive to the input signal, connected to the reset input of the timer, for producing a reset signal when the input signal satisfies the predetermined condition.
Claim 2
Dependent Claim
98 words
A triggering circuit responsive to the disruption of a normally continuous input signal to produce a measurement signal output, comprising: timer means having an adjustable alarm count and a reset input, producing a measurement signal output if the alarm count is reached; control means for programming the alarm count of the timer means at a value larger than the periodic interval at which the continuous input signal satisfies a predetermined condition; means responsive to the input signal, connected to the reset input of the timer, for producing a reset signal when the input signal satisfies the predetermined condition.
Claim 3
Independent Claim
111 words
A method for detecting and recording the disruption of a normally continuous input signal, comprising the steps of: monitoring the input signal to determine when the input signal satisfies a predetermined condition characteristic of the periodic cycle of the continuous signal; producing a trigger signal, indicating the normal behavior of the input signal, whenever the input signal satisfies the predetermined condition; timing the interval from the occurrence of each trigger signal; producing a measurement signal, indicating the disruption of the input signal, if the timed interval exceeds the periodic interval at which the continuous signal satisfies the predetermined condition; storing the input signal in a memory when a measurement signal occurs.
Claim 4
Independent Claim
111 words
A method for detecting and recording the disruption of a normally continuous input signal, comprising the steps of: monitoring the input signal to determine when the input signal satisfies a predetermined condition characteristic of the periodic cycle of the continuous signal; producing a trigger signal, indicating the normal behavior of the input signal, whenever the input signal satisfies the predetermined condition; timing the interval from the occurrence of each trigger signal; producing a measurement signal, indicating the disruption of the input signal, if the timed interval exceeds the periodic interval at which the continuous signal satisfies the predetermined condition; storing the input signal in a memory when a measurement signal occurs.
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) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |