Waveform measuring apparatus for easily providing pretrigger fun

Details Waveform measuring apparatus for easily providing pretrigger fun Waveform measuring apparatus for easily providing pretrigger fun

1996-01-16

1998-01-06

Voeltz, Emanuel T.

Boots, shoes, and leggings

364483, 364484, 364485, 364486, 324 7612, 324 7615, 324 7619, 324121R, 341122, 341126, 345134, G01R 1320

Patent

active

057062030

ABSTRACT:
A waveform measuring apparatus having a dummy readout circuit which applies first read signals of a same period as sampling signals to a read clock terminal of a FIFO memory during an interval between a first moment that a trigger enable signal is outputted from a prepoint counter when digital samples have been stored in the FIFO memory up to a predetermined number (a prepoint value) and a second moment that a trigger signal is generated by a trigger signal generating circuit. Concurrent reading from and writing to the FIFO memory is thereby permitted with a difference between the write pointer value and the read pointer value kept equal to the prepoint value. When a trigger signal is generated, digital data are written into the FIFO memory until the write pointer value catches up with the read pointer value and digital data are read from the FIFO memory by second read signals applied to it by a control unit. A display unit displays the waveform of the measured signal.

REFERENCES:
patent: 4495586 (1985-01-01), Andrews
patent: 4694244 (1987-09-01), Whiteside et al.
patent: 4835675 (1989-05-01), Kawai
patent: 5039937 (1991-08-01), Mandt et al.
patent: 5252977 (1993-10-01), Lueker et al.
patent: 5315627 (1994-05-01), Draving
patent: 5375067 (1994-12-01), Berchin
patent: 5397981 (1995-03-01), Wiggers

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