Self-calibration Method of Vertical Sensitivity of Digital Oscilloscope

Abstract

The invention discloses a method for self-calibrating the vertical sensitivity of a digital oscilloscope. The bias voltage is used as an internal correction source, and the bias voltage is adjusted down and up respectively to obtain the relative distance of the average value of the collected data during the two bias voltages. , then calculate the standard value of the relative distance, compare the relative distance and the standard value of the relative distance, calculate the gain adjustment value, adjust the gain adjustment device, reset the bias voltage and collect data, calculate the relative distance until the relative distance is at the standard value Within the error range, the calibration of the vertical sensitivity under the current channel ends. The invention calculates the relative distance by calculating the average value of the collected data when the bias voltage is set twice, so as to calculate the adjustment amount of the gain to adjust the gain, realize the self-correction of the vertical sensitivity of the digital oscilloscope, thereby saving human resources, and there is no artificial factors, improve the calibration accuracy, and improve the calibration efficiency.

Description

technical field [0001] The invention belongs to the technical field of digital oscilloscope correction, and more specifically relates to a method for self-calibrating the vertical sensitivity of a digital oscilloscope. Background technique [0002] For digital oscilloscopes, the traditional vertical sensitivity calibration method is manual calibration. When the channel coupling mode is AC coupling, input a 1kHz square wave signal, and set the input square wave according to the current vertical sensitivity (YID) at each vertical sensitivity. The amplitude value of the signal is Vpp=YID*6, even if the amplitude of the input signal occupies 6 divisions (div) in the vertical direction of the waveform display area under the current vertical sensitivity. Judging by naked eyes whether the amplitude of the input signal occupies 6 div in the vertical direction of the waveform display area, otherwise adjust the gain to make the amplitude of the input signal meet the requirements. Eac...

AI Technical Summary

Problems solved by technology

[0003] ① When the humidity and temperature of the use environment change, the accuracy of the components will be affected, resulting in the gain error not meeting the standard, and manual correction must be performed again at this time;

[0004] ② Manual calibration needs to input square wave signals with different amplitude values. When the user equipment is not complete and there is no signal source, the calibration cannot be implemented;

[0006] ④Manual correction is human observation and judgment, with large errors, low precision, time-consuming and high complexity;

[0007] ⑤Even if the semi-automatic correction method that automatically outputs square wave signals of different amplitudes and automatically collects and judges whether the signal reaches the target value is adopted, its accuracy is slightly higher than that of manual correction, but the automatic change of the output waveform requires additional equipment to support, which further requires The completeness of the user limits the use conditions of this function

[0008] It can be seen that the traditional calibration method requires additional equipment support, is easily affected by human factors, has low accuracy, and the process is complicated, time-consuming, laborious, and inefficient.

Images