Method and system for detecting bandwidth flatness and consistency of multichannel digital oscilloscope

A digital oscilloscope and detection method technology, applied in the direction of instruments, measuring devices, measuring electrical variables, etc., can solve time-consuming problems, achieve the effects of improving pass rate, shortening research and development time, and improving production efficiency

Active Publication Date: 2018-06-01
FUJIAN LILLIPUT OPTOELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is time-consuming, and in actual industrial production, hundreds of instrum

Method used

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  • Method and system for detecting bandwidth flatness and consistency of multichannel digital oscilloscope
  • Method and system for detecting bandwidth flatness and consistency of multichannel digital oscilloscope

Examples

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Example Embodiment

[0043] Example 1

[0044] in figure 1 In the flowchart shown, the oscilloscope calibrator is controlled by the program to output a high and low level as the start mark, and then continuously output a series of standard sinusoidal signals from low frequency to high frequency, and finally output a high and low level as the end mark, the program passes the waveform The recognition algorithm will cut off the high and low levels representing the starting position and the high and low levels representing the ending position from the waveform data collected from the oscilloscope. Through the interception operation, the collected original signal is processed into a signal from sparse to dense. The oscilloscope should be set in the slow sweep state when acquiring this waveform, and it should be ensured that the sampling rate of the oscilloscope at this time is much higher than 2 times the highest frequency of the output signal of the oscilloscope calibrator. This segment of the signal fr...

Example Embodiment

[0045] Example 2

[0046] Because most of the oscilloscopes produced have not only one channel, but two or four, or more. This requires our detection system to detect the bandwidth flatness of multiple channels at the same time, and then calculate the consistency between each channel. In this way, checking multiple channels takes the same time as detecting one channel, which greatly improves the production efficiency and greatly reduces the time cost. And it gives very intuitive and accurate results. The process steps are similar to those in Example 1, except that at this time, connect all the channels of the oscilloscope and the output channels of the oscilloscope calibrator, set the oscilloscope calibrator to output multiple channels of the same signal at the same time, and collect the data of multiple channels Enter the computing terminal for processing to obtain the frequency response curves of multiple channels. By drawing these curves together, it is very convenient to ob...

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Abstract

The invention discloses a method and system for detecting the bandwidth flatness and consistency of a multichannel digital oscilloscope, and the method comprises the following steps: S1, enabling an oscilloscope standard instrument to output high and low levels to all channels; S2, enabling the oscilloscope standard instrument to continuously output standard sine waves from 1Hz to the maximum bandwidth; S3, enabling the oscilloscope to scan the standard sine wave of each channel; S4, enabling the oscilloscope standard instrument to output an end identification to each channel; S5, enabling a detection program to extract the intensive waveform data collected by each channel of the oscilloscope; S6, dividing the data of the intensive waveform into a plurality of parts, and carrying out the waveform interception; S7, calculating the amplitude of each part of waveform data; S8, connecting the calculated amplitudes of all frequency points of all channels, and obtaining a corresponding frequency response curve; S9, comparing the consistency of all channels on the same image, and recording the frequency point with the maximum difference and the corresponding channel as oscilloscope consistency parameters. The method speeds up the circuit bandwidth debugging, and shortens a product research and development time.

Description

technical field [0001] The invention relates to the field of detection equipment, in particular to a multi-channel digital oscilloscope bandwidth flatness and consistency detection method and system thereof. Background technique [0002] As a key indicator of a digital oscilloscope, the flatness of the frequency response curve and the consistency of the curves between channels are direct technical indicators for judging the quality of an oscilloscope. Good bandwidth flatness can ensure that the signal under test can be restored without distortion as much as possible. When each channel collects the same signal with different frequencies, whether the displayed waveforms are consistent is a very intuitive reflection of the quality of the oscilloscope. The traditional methods for testing the frequency response curve of a digital oscilloscope include: (1) Input a step signal to obtain the step response of the digital oscilloscope, and perform a series of algorithms such as deriv...

Claims

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Application Information

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IPC IPC(8): G01R35/00
CPCG01R35/007
Inventor 蓝思凡吴朝荣薛增鑫
Owner FUJIAN LILLIPUT OPTOELECTRONICS TECH
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