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A Baseline Shift Nonlinear Self-Tuning Method for Digital Oscilloscope

A digital oscilloscope, self-calibration technology, applied in the direction of digital variable display, digital variable/waveform display, instruments, etc., can solve the problems that the accuracy of measurement results cannot be guaranteed, and achieve the effects of high efficiency, improved use accuracy, and improved performance

Active Publication Date: 2018-10-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

An oscilloscope that has not been calibrated, no matter how high its design index is, cannot guarantee the correctness of the measurement results

Method used

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  • A Baseline Shift Nonlinear Self-Tuning Method for Digital Oscilloscope
  • A Baseline Shift Nonlinear Self-Tuning Method for Digital Oscilloscope
  • A Baseline Shift Nonlinear Self-Tuning Method for Digital Oscilloscope

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Embodiment

[0025] figure 1 It is a specific implementation flow chart of the baseline shift nonlinear self-correction method of the digital oscilloscope of the present invention. Such as figure 1 As shown, the baseline shift nonlinear self-correction method of the digital oscilloscope of the present invention comprises the following steps:

[0026] S101: Setting the calibration target value:

[0027] Set the correction target value Y for the upward displacement of the baseline 1 and the corrected target value Y for the downward shift 2 .

[0028] The displacement baseline can be regarded as adding an offset voltage above the baseline zero level. When the offset voltage exceeds the vertical direction of the waveform display area of ​​the digital oscilloscope, it exceeds the quantization range of the ADC module. For the accuracy of correction, The baseline displacement shall not exceed the range in the vertical direction of the waveform display area. Note that the effective number of...

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Abstract

The invention discloses a baseline displacement nonlinear self-correction method of a digital oscilloscope, which sets correction target values ​​for upward displacement and downward displacement of the baseline, performs correction according to each correction target value, and obtains corresponding control codes. The correction method is as follows: Adjust the control code of the DAC module from 0 to obtain the average value y of the quantized value of the ADC module. When y<Yk, increase the adjustment step greatly. When y exceeds the correction target value Yk for the first time, it will gradually decrease in the reverse direction. Adjustment step, if adjusted to y<Yk, reverse the adjustment direction again, set the adjustment step to 1; during this adjustment process, if y=Yk or when the step is 1 and y exceeds the correction target value for the second time Yk, record the current control code as the control code corresponding to the correction target value; then calculate the shift nonlinear value according to the correction target value and control code corresponding to the upper and lower shifted baselines, and complete the baseline shift nonlinear correction. By adopting the invention, high-efficiency and high-precision baseline shift nonlinear correction can be realized.

Description

technical field [0001] The invention belongs to the technical field of digital oscilloscopes, and more specifically relates to a baseline shift nonlinear self-correction method of a digital oscilloscope. Background technique [0002] Self-calibration is one of the essential functions of an oscilloscope. When the oscilloscope is used for the first time, when the device is aging after a certain period of use, and when the ambient temperature changes and causes temperature drift, the oscilloscope must be calibrated. An oscilloscope that has not been calibrated, no matter how high its design index is, cannot guarantee the correctness of the measurement results. There are many parameters that need to be corrected in the self-calibration function, including the correction of the nonlinearity of the baseline shift. [0003] The non-linearity of baseline shift ensures that after the baseline position is shifted in a certain range, the baseline and indicator positions are still coi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R13/02G01R35/00
CPCG01R13/0209G01R35/005
Inventor 杨扩军蒋俊赵佳黄武煌叶芃邱渡裕
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA