Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Cathode ray
Patent
1994-10-25
1996-05-14
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Cathode ray
345134, 345131, G01R 1320
Patent
active
055171052
ABSTRACT:
A digital oscilloscope of the type that processes (30) the digital waveform values of the waveform record using interpolation and/or decimation (81) to produce a main trace record (91) and first (92) and second (93) zoomed trace records, and uses those records to produce (40) a main trace display (65) and first (61) and second (62) zoomed trace displays is improved by providing (94) a first zoom box (63) encompassing that portion of the main trace (65) display shown in the first zoomed trace (61) display and a second zoom box (64) encompassing that portion of the main trace (65) display shown in the second zoomed trace (62) display. Controls for the two zoom boxes are ganged together so that they both have a horizontal-time dimension determined (85) by a relationship between horizontal-time settings of the first zoomed trace display and horizontal-time settings of the main trace display and vertical-amplitude dimensions determined (87) by a relationship between vertical-amplitude settings of the first zoomed trace display and vertical-amplitude settings of the main trace display. The horizontal-time separation between the first and second zoomed displays, and therefore the two zoom boxes, is controllable (50) by an operator and provided as a readout (66) for measurement convenience.
REFERENCES:
patent: 4975636 (1990-12-01), Desautels
patent: 5039937 (1991-08-01), Mandt et al.
patent: 5129722 (1992-07-01), Mader
Tektronix TDS 420 & TDS 460 Digitizing Oscilloscopes User Manual From Years 1992 and 1993, pp. 2-25, 3-109 to 3-111.
Textronix Product Literature Manual From Years 1992 and 1993 pp. 65 and 57.
Griffith Boulden G.
Khosravi Kourosh Cyrus
Tektronix Inc.
Wieder Kenneth A.
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