| 摘要 |
PURPOSE:To facilitate identification with a simple operation, by displaying all waveforms of signals at a specified channel group having similar functions being overlapped on one line. CONSTITUTION:A sampling circuit 105 samples and digitizes an input signal 50 at a fixed cyclic interval prescribed by a sample clock 110. A trigger circuit 100 prescribes trigger conditions to be satisfied by the input signal 50 before the start of a sampling. Then, when the input signal 50 satisfies trigger conditions, the circuit 100 sends a signal to a memory control circuit 130 to store a sampled value generated with the circuit 105 into a trace memory 135. Sampling information stored in the memory 135 is processed with a microprocessor 150 and a display waveform is indicated 15 through a display memory 160. In this manner, a plurality of digital signals are displayed at the same logically high or low level, while the transition of the digital signals is displayed being overlapped between the same levels.
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