Base line shift nonlinear self-correcting method for digital oscilloscope
A digital oscilloscope, non-linear 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: 2016-12-07
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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An oscilloscope that has not been calibrated, no matter how high its des
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[0024] Example
[0025] figure 1 It is a flowchart of a specific implementation manner 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 includes the following steps:
[0026] S101: Set correction target value:
[0027] Set the correction target value Y for the upward displacement of the baseline 1 And the correction target value Y of the downward displacement 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 shift must not exceed the vertical range of the waveform display area. Note that the effective number of bits of the...
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The invention discloses a base line shift nonlinear self-correcting method for a digital oscilloscope, and the method comprises the steps: setting the correction target values of upward and downward displacements of a base line, carrying out the correction according to each correction target value, and obtaining corresponding control codes. The method also comprises the steps: adjusting a control code of a DAC module from zero; obtaining the mean value Y of collection quantitative values of the ADC module: greatly increasing the adjustment step if y is less than Yk; gradually reducing the adjustment step reversely if y exceeds the target correction value Yk for the first time; turning the adjustment direction reversely again if y is adjusted to be less than Yk, and setting the adjustment step as one; recording a current control code as the control code corresponding to the correction target value in the adjustment process if y is equal to Yk or when the step is one and y exceeds the correction target value Yk for the second time; calculating and obtaining a shift nonlinear value according to the correction target values and control codes corresponding to the upper and lower shift base lines, and completing the shift nonlinear correction of the base line. The method can achieve high-efficiency and high-precision base shift nonlinear correction.
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...
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Login to View More 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 ELECTRONIC SCI & TECH OF CHINA