| 摘要 |
PROBLEM TO BE SOLVED: To quickly make the test of a multi-channel waveform for a telecom mask. SOLUTION: A taking-in circuit 210 takes in each waveform sample of M signals from a circuit to be tested, and a controller 230 generates mask pixel data defining the mask. The waveform samples and the mask pixel data are stored to a raster memory 250. A raster circuit 240 reads the storing place of the memory, the waveform sample is written at a storing position presently storing the mask pixel and it judges the occurrence of mask collision. The total of the M input signal waveforms and the mask are shown on display means 280, 290.
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