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Digital oscilloscope, method for measuring Bode plot, and readable storage medium

A technology of digital oscilloscope and wave detection, applied in digital variable display, digital variable/waveform display, measuring device, etc. It can solve the problems of limiting the dynamic range of Bode plot and poor effect of Bode plot, etc., to filter out the interference of noise signals , improve the measurement error, improve the effect of signal-to-noise ratio

Active Publication Date: 2021-01-15
SHENZHEN CITY SIGLENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, digital oscilloscopes are broadband measuring instruments. When using existing methods to draw Bode plots, they are limited by the hardware of the oscilloscope itself. The effect of the Bode plots drawn by them is poor, which limits the dynamic range of Bode plots.

Method used

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  • Digital oscilloscope, method for measuring Bode plot, and readable storage medium
  • Digital oscilloscope, method for measuring Bode plot, and readable storage medium
  • Digital oscilloscope, method for measuring Bode plot, and readable storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] figure 2 A schematic structural diagram of a digital oscilloscope in an embodiment of the present invention is shown, as figure 2 As shown, the digital oscilloscope includes a first front-end module 1, a second front-end module 2, a signal source 3 and a processor 4, wherein the processor 4 includes: a main control module 40, a frequency selection module corresponding to the first front-end module 1 41, an effective value detection module 42, a frequency selection module 43 corresponding to the second front-end module 2, an effective value detection module 44, and a phase detection module 45. The main control module 40 is connected with the signal source 3, and is used to control the parameters of the signal source 3, such as parameters such as the frequency of the control signal source 3 and the amplitude of the output signal; The excitation signal of the test frequency, the signal source 3 inputs the excitation signal to the input port of the DUT to detect the DUT....

Embodiment 2

[0046] Embodiment 1 is described by taking the signal source integrated in the digital oscilloscope as an example. In practical applications, an external signal source can also provide the excitation signal. Based on this, the digital oscilloscope may only include the first front-end module, at least one first Two front-end modules and a processor, the processor includes a main control module, a phase detection module corresponding to the second front-end module, a frequency selection module and an effective value detection module corresponding to the first front-end module and the second front-end module respectively.

[0047] Similarly, taking a digital oscilloscope including a second front-end module as an example, the structural diagram of the digital oscilloscope can be found in image 3 , including a first front-end module 1, a second front-end module 2 and a processor 4, wherein the processor 4 includes: a main control module 40, a frequency selection module 41 correspon...

Embodiment 3

[0049] Based on the digital oscilloscope described in Embodiment 1, Figure 4 A schematic diagram of the structure of a specific digital oscilloscope is shown, such as Figure 4 shown, with figure 2 The difference is that the first front-end module 1 of the digital oscilloscope includes an analog front-end 11 and an analog-to-digital converter 12, the second front-end module 2 includes an analog front-end 21 and an analog-to-digital converter 22, and the frequency selection module 41 includes a signal search unit 411 and The filtering unit 412, the frequency selection module 43 include a signal search unit 431 and a filtering unit 432; the effective value detection module 42 is also used to control the gain parameter of its corresponding first front-end module 1 according to the detection result, and the first front-end module 1 is then based on this The gain parameter performs signal conditioning on the collected input signal; the effective value detection module 44 is also...

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Abstract

The invention discloses a digital oscilloscope and a method for measuring a bode diagram, and a readable storage medium. The digital oscilloscope comprises a first front end module, at least one second front end module, a signal source and a processor; the first front end module and the second front end collect an input signal and an output signal of a tested part, and preprocess the respectivelycollected signal; the processor performs effective signal searching on the preprocessed signals to obtain the respective actual signal frequency; the measurement error caused by the element precisionproblem is improved; the collected signal is filtered according to a searching result so as to filter the interference of the noise, the signal to noise ratio of the signal is improved, the phase discrimination processing and the effective value detection wave processing are performed on the filtered signal so as to obtain phase difference of the input signal and the output signal and the corresponding detection wave data; and finally, the bode diagram is drawn according to the phase difference and the detection wave data. The measurement data is hard to be interfered by various noises, the signal-to-noise ratio of the measurement result is improved, and the precision of the drawn bode diagram is higher.

Description

technical field [0001] The invention relates to the technical field of test and measurement, in particular to a digital oscilloscope, a method for measuring Bode diagrams, and a readable storage medium. Background technique [0002] The Bode plot, also known as the amplitude-frequency response and phase-frequency response curves, is a graph commonly used in electronic engineering to describe the frequency response of a system, which can reflect the gain and phase changes of the system output signal relative to the input signal, respectively. frequency relationship. There are many ways to draw a Bode plot, for example, you can use an oscilloscope and a signal source to complete the drawing. When using a traditional analog oscilloscope to draw a Bode plot, you can only manually read and draw point by point, which is time-consuming and laborious, and the measurement accuracy is not high. The emergence of digital oscilloscopes provides more automation functions for waveform me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R13/02G01R23/16
CPCG01R13/0209G01R13/0272G01R13/029G01R23/16
Inventor 蒋宇辰李富伟宋民
Owner SHENZHEN CITY SIGLENT TECH
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