High-refresh-rate digital oscilloscope with function of displaying three-dimensional waveform information

Abstract

The invention discloses a high-refresh-rate digital oscilloscope with a function of displaying three-dimensional waveform information. A signal to be measured is sent to a triggering unit and an A/D (Analog/Digital) conversion unit through an analog signal conditioning unit; a sampled data processing unit is used for controlling the A/D conversion unit to sample and store the sampled data to a sampled data storage unit; a three-dimensional waveform processing unit is used for reading data sequences SAMPLE in sequence from the sampled data storage unit and mapping and counting the data sequences SAMPLE into a data dot matrix representing three-dimensional information, wherein the column number and the row number of the data dot matrix are respectively equal to a horizontal resolution X and a vertical resolution Y of a waveform display area of a display unit; a waveform data attenuation unit is used for reading the data dot matrix from the three-dimensional waveform processing unit, merging the data dot matrix read from the three-dimensional waveform processing unit with a data dot matrix of the waveform data attenuation unit and then transmitting a merging result to a CPU (Central Processing Unit) control unit; the waveform data attenuation unit is used for attenuating the merging result once and then storing the merging result to a data point; and the CPU control unit is used for converting received data into image data represented by color or brightness and then transmitting the image data to the display unit for displaying.

Description

technical field [0001] The invention relates to a digital oscilloscope, in particular to a high refresh rate digital oscilloscope capable of displaying three-dimensional waveform information. Background technique [0002] Most of the oscilloscopes currently available on the market use the CPU as the processing core, and use the serial method to process the waveform data, that is, the analog signal is stored in a sampling data memory after being sampled by A / D, and after a waveform is sampled, the sampled The data in the data memory is transmitted to the CPU, and the CPU performs graphical processing on the data and sends it to the display unit for display. This leads to a large amount of CPU time spent on data transmission, graphics processing and display, so that the analog signal cannot be re-sampled before the CPU is idle, thereby losing a large amount of waveform information. When there are occasional abnormalities in the measured signal The oscilloscope may not be able...

AI Technical Summary

Problems solved by technology

However, its shortcomings are: its data sampling, graphical processing, and graphical data transmission to the CPU are still in a serial manner, that is, it must be followed in three steps: the first step, data sampling; the second The first step is graphical processing; the third step is the transmission of graphical data to the CPU

The digital oscilloscope using the persistence algorithm can partially display this information to some extent, but it is limited to the accumulation between each screen of data, and only shows the repetitive characteristics of the signal in a larger time span. Single or multiple waveforms do not count their signal repeatability characteristics

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