Digital storage oscilloscope with marker for trigger location

Details Digital storage oscilloscope with marker for trigger location Digital storage oscilloscope with marker for trigger location

1986-09-09

1988-10-18

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315377, 364487, 328189, H01J 2970, G01R 1330, G01R 2702

Patent

active

047790288

ABSTRACT:
A digital storage oscilloscope comprises an analog-to-digital converter for receiving an analog input signal and generating a succession of data words representative of the instantaneous magnitude of the input signal at a succession of equally-spaced sample times. A waveform memory has a plurality of separately addressable storage locations for storing the succession of data words at locations of which the addresses are related to the respective sample times. A trigger circuit compares the instantaneous magnitude of the analog input signal with a predetermined trigger level and generates a trigger pulse when the instantaneous magnitude of the input signal bears a predetermined relationship to the trigger level. The trigger circuit also causes an address word to be stored that defines the storage location for the first data word that occurs after the trigger pulse. The stored address word and the data word stored at the location defined by the stored address word are used to cause a visually distinct marker to be generated on the screen of the oscilloscope at a location that represents the time of occurrence of the trigger pulse.

REFERENCES:
patent: 3859556 (1975-01-01), Schumann
patent: 4072851 (1978-02-01), Rose
patent: 4092567 (1978-05-01), Sarrit
patent: 4642519 (1987-02-01), Nakatsugawa et al.

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