University of Electronic Science and Technology of China

Jia Zhao

Yuhua Cheng

Kai Chen

Bo Xu

Libing Bai

Songting Zou

Hang Geng

Yanjun Yan

Hao Zeng

Lianping Guo

Qinchuan Zhang

Kuojun Yang

Jinpeng Song

Lulu Tian

Xiaoyu Huang

The present invention provides a system for data mapping and storing in digital three-dimensional oscilloscope, wherein the fixed coefficients, which are calculated according the parameters and settings of a digital oscilloscope, are stored into a fixed coefficient memory CO RAM, the fixed coefficients are outputted to N fractional operation units through N−1 D flip-flop delay units to multiply with the acquired data x(n) and then be accumulated, thus N fractional calculus results are obtained. In this way, N fractional calculus results can be obtained by performing L/N fractional calculus operations. N fractional calculus results are sent to a signal processing and display module, in which they are converted into a display data through a drawing thread, and the display data are sent to LCD for displaying, thus the fractional calculus operation and display of a input signal in a digital oscilloscope is realized.

Digital oscilloscope having fractional calculus operation and display function

A system maps and stores data in digital three-dimensional oscilloscope, wherein an ADC module has four ADC submodules. Four acquired waveform data are sent to an extraction module, and buffered in a FIFO module. When a trigger signal arrives, FIFO module outputs four extracted waveform data to a mapping address calculation module for calculating a mapping address and a RAM serial number for each point data, and the waveform data comparison and control module performs the reading and writing control of the 4&#xd7;N dual port RAMs. When mapping number reaches a frame number, the RAM array module outputs its waveform probability values to the upper computer module to convert each value into RBG values, and the display module displays the waveforms of input signals of four channels on a screen according the RBG values.

System for data mapping and storing in digital three-dimensional oscilloscope

A method for measuring waveform capture rate (WRC) of DSO based on average dead time measurement. First generating ramp signal or symmetric triangular wave signal as base signal, a trigger signal, the frequency which is higher than the nominal maximum waveform capture rate of the DSO under measurement; secondly, setting the parameters of DSO for measuring; then obtaining a plurality of test signals by delaying base signal K times with different delay time, for each test signal, inputting it the trigger signal simultaneously to DSO, calculating dead time between two adjacent captured waveforms according to their initial voltages, finally calculating waveform capture rate based on average dead times. The waveform capture rate obtained can effectively reflect the overall capturing capacity of DSO, more tellingly, the waveform capturing capacity of acquisition system of DSO.

Method for measuring the waveform capture rate of a digital storage oscilloscope based on average dead time measurement

Growing community of inventors

Chengdu, China

Jia Zhao