An Oscilloscope with External Trigger Function

Abstract

The invention discloses an oscilloscope with an external triggering function. The oscilloscope comprises a data sampling unit, an external triggering unit, a triggering control unit, and a sampling storage unit, wherein the data sampling unit is used for implementing digital sampling on a detected signal depending on a sampling clock to obtain sampling data; the external triggering unit is used for implementing level comparison treatment on an external introduced signal to generate an external triggering signal; the triggering control unit is used for implementing digital sampling operation on the external triggering signal, and also can be used for generating a triggering control signal depending on a result of the digital sampling; and the sampling storage unit for storing the sampling data depending on the triggering control signal to generate waveform display data for waveform display. According to the oscilloscope with the external triggering function, disclosed by the invention, the digital sampling operation is implemented on the external triggering signal to achieve the external triggering function, and the external triggering is realized by a digital part, so the precision error caused by discreteness, uncontrollable time delay, and the like of a simulating component is eliminated.

Description

technical field [0001] The invention relates to the technical field of test and measurement, in particular to an oscilloscope with an external trigger function. Background technique [0002] Oscilloscope is an electronic measuring instrument with a wide range of uses. It can convert electrical signals invisible to human eyes into waveform images visible to human eyes, which is convenient for people to study the changing process of various electrical signals. The traditional analog oscilloscope uses an analog circuit (oscilloscope), and its electron gun emits electrons to the screen. The emitted electrons are focused to form an electron beam, and hit the screen coated with fluorescent material on the inner surface, so that the point hit by the electron beam is Light is emitted, which traces a wavy curve. Digital storage oscilloscopes (DSO), referred to as digital oscilloscopes, convert the measured signal into digital information through an analog-to-digital converter and st...

AI Technical Summary

Problems solved by technology

[0007] The existing external trigger needs to be realized by analog devices. Due to the discreteness of analog devices, it will bring random precision errors to the trigger system, and the uncontrollable delay difference of analog devices will lead to different channels. trigger delay

All of these need to be adjusted and balanced by adding calibration in the digital part, which invisibly reduces the work efficiency of the trigger and increases the complexity of the design and debugging of the digital part.

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