Method and apparatus for detecting aliasing

摘要

In a method and apparatus for detecting occurrence of aliasing in a digital oscilloscope and displaying an alarm on a display unit, when an input signal is applied to a trigger generator circuit, the trigger generator circuit generates a trigger pulse. An aliasing detection counter counts the number of the trigger pulses generated in the period of time between scan clock pulses generated from a timebase circuit and applies an aliasing detection signal to a CPU. The CPU displays on the display unit the message indicating occurrence of aliasing.