Horology: time measuring systems or devices – Time interval – Electrical or electromechanical
Patent
1988-06-30
1989-08-08
Roskoski, Bernard
Horology: time measuring systems or devices
Time interval
Electrical or electromechanical
G04F 800
Patent
active
048559687
ABSTRACT:
An oscilloscope automatically measures an interval between first and second triggering events in a repetitive input signal. The oscilloscope includes A and B sweep circuits for generating event triggered "A" and "B" sweep ramps, respectively. The oscilloscope also includes two comparators. One comparator generates an "A" indicating signal when the A sweep ramp reaches the level of a first adjustable reference signal. The other comparator generates a "B" indicating signal when the B sweep ramp reaches the level of a second adjustable reference signal. The oscilloscope initially sets both sweep circuits to repetitively trigger on the first event and sets the first reference signal to a constant level. While monitoring relative timing of the A and B indicating signals, the oscilloscope iteratively adjusts the second reference signal to a "first pass" level for which the A and B indicating signals are repetitively generated at substantially similar times. Thereafter, the B sweep ramp is set to repetitively trigger on the second triggering event while the A sweep ramp continues to repetitively trigger on the first triggering event. The oscilloscope then iteratively adjusts the second reference signal to a "second pass" level at which the A and B indicating signals are again generated at substantially similar times. The difference between the first and second pass levels is proportional to, and therefore a measure of, the interval between the first and second trigger events.
REFERENCES:
patent: 4053937 (1977-10-01), Hersey, Jr.
patent: 4105932 (1978-08-01), Cleary, Jr. et al.
patent: 4350953 (1982-09-01), Best et al.
Bedell Daniel J.
Meza Peter J.
Roskoski Bernard
Tektronix Inc.
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