Electronic test instrument for component test

Details Electronic test instrument for component test Electronic test instrument for component test

1994-08-11

1996-04-16

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Cathode ray

324111, 364487, G01R 1300, G01R 1320

Patent

active

055086071

ABSTRACT:
A "component test" function is provided in a low-power, portable test instrument like a digital multimeter. A test stimulus waveform is synthesized digitally, and a digital trigger signal from the synthesizing circuitry is used to trigger acquisition of measurement data. A single-channel front end acquires voltage scan data over one cycle of the test stimulus waveform following the trigger point. Current scan data is later acquired through the same acquisition circuitry beginning at the same trigger point relative to the start of a later cycle of the stimulus waveform, so that the voltage and current scan data, although acquired separately, are very closely synchronized relative to the stimulus waveform, as a result of which they maintain their phase relationship. Stored voltage and current scan data are aligned accordingly and concurrently displayed so as to form a Lissajous pattern on a small display. The invention thus provides improved component test capability in a small, portable instrument, including graphic display of test results.

REFERENCES:
patent: 3299352 (1967-01-01), Carroll
patent: 4074195 (1978-02-01), Hunt
patent: 4386317 (1983-05-01), Clinton
patent: 4763066 (1988-08-01), Young et al.
patent: 4965516 (1990-10-01), Parshotam et al.
patent: 5003254 (1991-03-01), Hunt et al.
patent: 5153501 (1992-10-01), Shimada et al.

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