Method and device for automatic setting of oscilloscope

Abstract

The invention provides a method for automatically setting an oscilloscope. The method comprises the steps of setting an analog channel to a designated state; adjusting the fixed attenuation gear of the analog channel; adjusting the level position of a trigger circuit, so that the measured signal and a trigger comparator generate a signal which can be used for frequency measurement; measuring the frequency of the measured signal and obtaining a frequency value, calculating an x-axis time base through the frequency value; acquiring the measured signal and calculating the voltage amplitude of themeasured signal; and adjusting the amplitude of the y-axis according to the voltage amplitude, so that the amplitude of the y-axis is adapted to the voltage amplitude of the measured signal. The method for automatically setting the oscilloscope is based on a double-channel or four-channel oscilloscope automatic setting algorithm, and realizes fast and automatic setting by changing a part of algorithm concepts.

Description

technical field [0001] The invention belongs to the field of oscilloscopes, and in particular relates to an oscilloscope automatic setting method and equipment thereof. Background technique [0002] At present, digital oscilloscopes generally include: front-end analog channels, data acquisition and storage units, trigger circuits, monitoring and analysis processing parts, display and human-computer interaction parts. The analog-to-digital converter in the data acquisition storage unit 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. 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. The traditional two-chann...

AI Technical Summary

Problems solved by technology

The traditional two-channel or four-channel oscilloscope automatic setting will first use the analog-to-digital converter to collect data and measure the signal amplitude. If the signal amplitude exceeds the range, the channel attenuation will be changed to adapt to the signal, and the signal will be re-acquired and calculated again; thus it is possible It needs to be collected multiple times; moreover, because the signal frequency is uncertain, the X-axis cannot be determined, so a slower X-axis time base can only be selected for use, but if the input signal at this time and the current time base are under-sampled, there will be When false waves appear, the collected signal cannot be used as the basis for judging the amplitude. At this time, frequency measurement is required to further determine the time base

If you use a frequency meter to measure the signal time base at the beginning, but because the voltage amplitude of the signal is unknown, you can only set a fixed voltage volt level to use it. If a very large signal appears, it will usually make the analog channel In a state of deep saturation, the frequency value measured by the frequency meter at this time cannot be used as a standard for judging the time base

Therefore, this method is limited by the frequency of the input signal, and most of the time it is impossible to obtain accurate parameters of the measured signal at one time, so the automatic setting time of the guidance is too long, especially when four channels work at the same time.

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