Automatic setting method of digital oscilloscope

A digital oscilloscope and automatic technology, applied in the field of measuring instruments, can solve the problems of long automatic setting time and inaccurate frequency measurement, and achieve the effect of increasing speed, improving search efficiency and improving efficiency

Inactive Publication Date: 2009-12-23
SOUTHEAST UNIV
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  • Application Information

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Problems solved by technology

However, when faced with low-frequency signals, the frequency measurement is usually not accurate enou

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  • Automatic setting method of digital oscilloscope
  • Automatic setting method of digital oscilloscope
  • Automatic setting method of digital oscilloscope

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] The invention provides an automatic setting method of a digital oscilloscope, which is used for improving the speed and precision of the automatic setting, and stably displaying the signal on a display screen. The direct frequency measurement method and the periodic measurement method are combined and carried out simultaneously to measure the signals of different frequency bands, and the binary search method is used to improve the search efficiency when measuring the signal amplitude.

[0038] In order to achieve the above-mentioned purpose of the invention, the present invention provides an automatic setting method of a digital oscilloscope, which includes the following steps: it is difficult to directly measure the frequency of external multi-channel input signals, but the channel signal and the trigger signal are signals of the same frequency, so it can The f...

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Abstract

The invention provides an automatic setting method of a digital oscilloscope. The method comprises the following steps that in step S1, an analogue input signal channel at the front end is set into an AC coupling mode, the DC level in the input signal is filtered, the trigger signal level in a trigger system is set into zero level, the input signal is converted into a trigger signal in a square wave method, and the frequency of the trigger signal in the square wave method is fx; in step S2, the time base shift of the digital oscilloscope is set, and the intermediate frequency fm is set to f0 * fc, wherein, f0 is the fixed timer frequency. The fixed timer frequency f0 can satisfy that at least the input signal of one cycle is displayed on the display screen. The invention simultaneously carry out frequency measurement and amplitude measurement on the input signals of multiple paths to enhance the automatically set frequency; the method of combining and simultaneously carrying out the direct frequency measurement and the multiple-cycle measurement is adopted during automatic frequency measurement, thus the accuracy and efficiency of the frequency measurement are enhanced.

Description

technical field [0001] The invention relates to a measuring instrument, in particular to a method for realizing the automatic setting function of a digital oscilloscope. Background technique [0002] At present, digital oscilloscopes generally include: front-end analog channels, data acquisition and storage parts, trigger systems, monitoring and analysis processing parts, display and human-computer interaction parts. The analog-to-digital converter in the data acquisition and storage part converts the analog signal conditioned by the front-end analog channel into a digital signal and stores it. When the monitoring and analysis processing part needs to process data, it reads the data in the memory. [0003] In order to observe the signal under test accurately, the signal under test must be displayed stably on the display. Therefore, it is necessary to adjust the horizontal time base, vertical amplitude, trigger channel, and trigger level to appropriate values. However, som...

Claims

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Application Information

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IPC IPC(8): G01R13/02
Inventor 高礼忠罗张贺丙杰常斌
Owner SOUTHEAST UNIV
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