| 摘要 |
A sampling oscilloscope is known, in which a delayed pulse generator is provided to generate delayed pulses successively delayed, by regulatable times, with respect to the period of a synchronous signal by comparison between respective instantaneous levels of a high-speed saw-tooth wave synchronized with the synchronous signal and of a sweep voltage of a cathode-ray tube, and in which a sampled output of an input signal sampled by the delayed pulses is displayed on the screen of a cathode-ray tube by the use of the sweep voltage. In accordance with the principle of this invention, an attenuation circuit is provided before the delayed pulse generator to further attenuate the sweep voltage; a mode switch is provided for switching, for the delayed pulse generator, two paths of the sweep voltage in one of which the attenuation circuit is provided; and the mode switch is switched by a switch controller in response to a switching signal.
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