Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Cathode ray
Patent
1986-11-10
1988-01-12
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Cathode ray
364487, 364580, G01R 1320
Patent
active
047194162
ABSTRACT:
Disclosed is a method for determining and executing the minimum number of sample acquisition-sweeps necessary to meet the risetime specifications of a digital oscilloscope which uses random repetitive sampling. The method of the present invention selects from two criteria to determine the required number of acquisition sweeps. At narrow time ranges a risetime criterion is used. At wider time ranges a percentage-filled criterion is used. The choice between criteria depends upon the user-selected time range setting. The time range setting directly affects the time-width of each one of a fixed number of time-buckets. A time-bucket is a discrete unit of time which varies directly with the time-width of the user-selected time range. The number of time-buckets is fixed. Time-buckets can be manifested either on the oscilloscope display screen or in the oscilloscope's memory. At time range settings where the time-width of each time-bucket is less than or equal to one-half of the risetime of the oscilloscope, the risetime criterion applies and ensures, prior to display of a waveform, that there is at least one sample point for each risetime-unit of time throughout all the time-buckets. At time range settings where the width of each time-bucket is greater than one-half of the risetime of the oscilloscope, the percentage-filled criterion applies and ensures, prior to display of a waveform, that a certain percentage of the time-buckets have been filled with sample point data. The minimum number of acquisition-sweeps necessary, using either the risetime or the percentage-filled criterion, is determined using a binomial probability formula.
REFERENCES:
patent: 4104725 (1978-08-01), Rose et al.
patent: 4142146 (1979-02-01), Schumann et al.
patent: 4495586 (1985-01-01), Andrews
patent: 4694244 (1987-09-01), Whiteside et al.
Byrne Christopher J.
Hewlett -Packard Company
Karlsen Ernest F.
Stark Jon R.
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