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Oscilloscope automatic calibration method based on gain judgment

An automatic calibration and oscilloscope technology, applied in the field of measuring instruments, can solve problems such as long waiting time for calibration results, increase calibration time, and reduce user experience, and achieve the effect of reducing automatic calibration time, avoiding infinite loops, and avoiding timeout waiting time.

Active Publication Date: 2017-04-26
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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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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  • Oscilloscope automatic calibration method based on gain judgment
  • Oscilloscope automatic calibration method based on gain judgment
  • 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. The oscilloscope automatic calibration method comprises the steps of: calculating a theoretical gain control word of a digitally controlled attenuator corresponding to each amplitude gear of an oscilloscope at first; reading a digitally controlled attenuator gain control word corresponding to a current amplitude gear from existing calibration data before automatic calibration of each amplitude gear; if the digitally controlled attenuator gain control word is within an error range of the theoretical gain control word, executing automatic calibration of the corresponding amplitude gear, otherwise, jumping over the amplitude gear; and outputting automatic calibration information to a user so as to prompt the user after calibration of all the amplitude gears is completed. The oscilloscope automatic calibration method based on gain judgment avoids the overtime waiting time in the traditional automatic calibration process when the gain is incorrect through carrying out gain judgment in advance, can effectively avoid the endless loop caused by the incorrect gain, shortens the automatic calibration time of the oscilloscope when the gain is incorrect, and improves the automatic calibration efficiency and user experience of the oscilloscope.

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 Applications(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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