Abnormal waveform recording method for oscilloscope with high capture rate

Abstract

The invention discloses an abnormal waveform recording method for an oscilloscope with a high capture rate. The method comprises the following steps: arranging a time stamp counter in an FPGA (Field Programmable Gate Array); binding a time stamp with a real-time clock at a DSP (Digital Signal Processor) end; comparing waveform data acquired by using the FPGA with an abnormal waveform detection template; when an abnormal waveform appears, storing abnormal waveform data and a corresponding time stamp in a DDR (Double Data Rate); and calculating the generation time of the abnormal waveform data via a corresponding relation between the time stamp and the real-time clock at the DSP end so as to realize time positioning of abnormal waveforms. According to the method, only abnormal waveform data are stored, and normal waveform data are not stored, so that the abnormal waveform capturing capacity can be increased; and meanwhile, time positioning of abnormal waveforms is also realized, and manual observation and recording are not required. Abnormal waveforms can be displayed by adopting multiple display modes, so that abnormal waveforms can be analyzed conveniently.

Description

technical field [0001] The invention belongs to the technical field of digital oscilloscopes, and more specifically relates to a method for recording abnormal waveforms of an oscilloscope with a high capture rate. Background technique [0002] In recent years, as modern electronic signals have become increasingly complex and diverse, the frequency range of signals has been continuously expanded, and the transient and non-stationary signals have been increasing, which has brought challenges to electronic design. As the most commonly used time-domain testing instrument, an oscilloscope needs to be able to effectively capture and observe abnormal waveforms in circuit design and system debugging, so as to analyze the time and cause of failures. [0003] The waveform capture rate of the oscilloscope is an important evaluation index of the oscilloscope. It refers to the number of waveforms (wfms / s) that the oscilloscope can capture and display per unit time. It expresses the amoun...

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Problems solved by technology

[0010] Although the existing anomaly detection and observation technology has improved the capture rate of abnormal waveforms to a certain extent, and can observe the normal waveforms before and after the occurrence of abnormal waveforms, there are still many deficiencies, such as: 1) It is impossible to completely observe each abnormal waveform 2) It is impossible to observe the abnormal waveform that appears in a long period of time; 3) It is impossible to locate the time point of each occurrence of the abnormal waveform

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