Alternate triggering in digital oscilloscopes
AssigneeTektronix, Inc.
InventorsJames L. Tallman, Kenneth R. Rockwell
Life of this patent
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Abstract
A digital storage oscilloscope includes a source of two or more input signals and a display device. An alternate triggering mechanism includes a selector for selecting one of the input signals. A trigger circuit is responsive to the selected input signal, and generates a trigger signal when a trigger condition is satisfied. A raster signal generator includes a plurality of waveform memories each associated with a respective input signal and responsive to the trigger signal for storing data representing the selected input signal in the waveform memory associated with the selected input signal. The raster signal generator generates a raster image signal representing the selected input signal.
Claims11
In a digital storage oscilloscope including a source of two or more input signals and a display device, an alternate triggering mechanism, comprising:
- a selector, coupled to the input signal source, for sequentially selecting respective ones of the input signals;
- a trigger circuit, responsive to the selected input signal, for generating a trigger signal when a trigger condition is satisfied;
- and
- a raster signal generator, coupled between the input signal source and the display device, and including a plurality of waveform memories each associated with a respective input signal and responsive to the trigger signal for storing data representing the selected input signal in the waveform memory associated with the selected input signal, the raster signal generator generating an image signal representing the waveform of the signals represented by the data in the plurality of waveform memories.
In a digital storage oscilloscope including a source of at least two input signals, and a display device, a method for providing alternate triggering, comprising the steps of:
- sequentially selecting respective ones of the input signals;
- generating a trigger signal, in response to the selected input signal, when a trigger condition is satisfied;
- storing data representing the selected signal in response to the trigger signal;
- generating a raster image signal from newly stored data representing the selected input signal;
- and
- displaying an image represented by the image signal.
Dependencies are inferred from the claim text.