Automatic setting method of digital oscilloscope

Abstract

The invention provides an automatic setting method of a digital oscilloscope. The method comprises the following steps that in step S1, an analogue input signal channel at the front end is set into an AC coupling mode, the DC level in the input signal is filtered, the trigger signal level in a trigger system is set into zero level, the input signal is converted into a trigger signal in a square wave method, and the frequency of the trigger signal in the square wave method is fx; in step S2, the time base shift of the digital oscilloscope is set, and the intermediate frequency fm is set to f0 * fc, wherein, f0 is the fixed timer frequency. The fixed timer frequency f0 can satisfy that at least the input signal of one cycle is displayed on the display screen. The invention simultaneously carry out frequency measurement and amplitude measurement on the input signals of multiple paths to enhance the automatically set frequency; the method of combining and simultaneously carrying out the direct frequency measurement and the multiple-cycle measurement is adopted during automatic frequency measurement, thus the accuracy and efficiency of the frequency measurement are enhanced.

Description

technical field [0001] The invention relates to a measuring instrument, in particular to a method for realizing the automatic setting function of a digital oscilloscope. Background technique [0002] At present, digital oscilloscopes generally include: front-end analog channels, data acquisition and storage parts, trigger systems, monitoring and analysis processing parts, display and human-computer interaction parts. The analog-to-digital converter in the data acquisition and storage part converts the analog signal conditioned by the front-end analog channel into a digital signal and stores it. When the monitoring and analysis processing part needs to process data, it reads the data in the memory. [0003] In order to observe the signal under test accurately, the signal under test must be displayed stably on the display. Therefore, it is necessary to adjust the horizontal time base, vertical amplitude, trigger channel, and trigger level to appropriate values. However, som...

AI Technical Summary

Problems solved by technology

However, when faced with low-frequency signals, the frequency measurement is usually not accurate enough; when multiple input signals are turned on at the same time, the automatic setting time is too long

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