| 摘要 |
An apparatus for displaying a waveform of an input signal on a display includes a synchronization detecting circuit, a sweep generating circuit, a horizontal axis drive circuit, a switching circuit, a variable gain amplifier, a vertical axis drive circuit, and a vertical location arrangement circuit. The horizontal axis drive circuit drives the horizontal axis of the display on the basis of a sweep signal generated at the sweep generating circuit synchronously with a sweep trigger signal obtained by dividing synchronization detecting pulses from the synchronization detecting circuit by N (N-1, 2, . . . ). The switching circuit alternately transfers the input signal and a cursor signal at a high rate to provide a multiplexed input/cursor signal to the vertical axis drive circuit through the variable gain amplifier. The vertical location arrangement circuit generates a vertical location arrangement signal stepwisely variable synchronously with the sweep trigger signal to the vertical axis drive circuit, where the multiplexed input/cursor and vertical location arrangement signals are combined to provide a vertical axis drive signal. Accordingly at least two sliced portions of the waveform with the cursors are displayed on the left and right sides of the display in an enlarged/divided display mode (N>/=2), and the whole waveform with the cursors is displayed on the display in a normal display mode (N=1).
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