An Oscilloscope Automatic Calibration Method Based on Gain Judgment

An automatic calibration, oscilloscope technology, applied in the field of measuring instruments, can solve problems such as reducing user experience, increasing calibration time, and waiting for long calibration results, reducing automatic calibration time, avoiding infinite loops, and improving automatic calibration efficiency and user experience. Effect

Active Publication Date: 2019-01-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Therefore, when the gain is wrong, the calibration time will be greatly increased, causing the user to wait too long for the calibration result and reducing the user experience

Method used

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  • An Oscilloscope Automatic Calibration Method Based on Gain Judgment
  • An Oscilloscope Automatic Calibration Method Based on Gain Judgment
  • An Oscilloscope Automatic Calibration Method Based on Gain Judgment

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Embodiment

[0035] Figure 4 It is a specific implementation flow chart of the oscilloscope automatic calibration method based on gain judgment. Such as Figure 4 As shown, the oscilloscope automatic calibration method based on gain judgment of the present invention comprises the following steps:

[0036] S401: Calculate the theoretical gain control word:

[0037] In general, gain control is divided into 3 parts: digitally controlled attenuator, fixed amplifier, and fixed attenuator. The complete control of the gain also includes other auxiliary means to achieve precise control, such as fine adjustment through ADC, etc. The fine adjustment has little effect on the calibration of zero offset and shift control, so this factor is not considered in the present invention. Generally, fixed amplifiers and fixed attenuators are related to amplitude files, and the multiples are fixed during design. Therefore, the only components with adjustable gain when the oscilloscope leaves the factory are ...

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Abstract

The invention discloses an oscilloscope automatic calibration method based on gain judgment. Firstly, the theoretical gain control word of the digital control attenuator corresponding to each amplitude gear of the oscilloscope is calculated, and then before each amplitude gear is automatically calibrated, the calibration data is obtained from the existing calibration data. Read the gain control word of the digital control attenuator corresponding to the current amplitude gear, if it is within the error range of the theoretical gain control word, perform automatic calibration of this amplitude gear, otherwise skip this amplitude gear and calibrate in all amplitude gears When complete, output an autocalibration message to the user to prompt the user. The invention avoids the overtime waiting time when the gain is wrong in the traditional automatic calibration process by pre-judging the gain, and can also effectively avoid the dead cycle caused by the wrong gain, reduce the automatic calibration time of the oscilloscope when the gain is wrong, and improve the performance of the oscilloscope. Automatic calibration efficiency and user experience.

Description

technical field [0001] The invention belongs to the technical field of measuring instruments, and more specifically relates to an oscilloscope automatic calibration method based on gain judgment. Background technique [0002] Oscilloscopes are widely used as a general-purpose instrument. To observe the signal with the oscilloscope, it must first go through the conditioning of the analog channel before it can be effectively observed. The analog channel involves gain adjustment, zero offset adjustment, moving linear adjustment, etc. Some of these adjustments must be adjusted before leaving the factory, such as gain control, and some need to be adjusted by the user after leaving the factory with the increase of use time. The automatic calibration function of the oscilloscope mainly includes zero offset calibration, moving linear calibration, trigger calibration and so on. [0003] figure 1 It is the schematic diagram of the analog channel of the oscilloscope. Such as figur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R35/00
CPCG01R35/005
Inventor 赵勇叶芃蒋俊邱渡裕曾浩
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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