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Digital oscillograph and its waveshape displaying method

A digital oscilloscope, waveform display technology, applied in the direction of digital variable display, etc., can solve the problem of not being able to observe the overall outline of the waveform at the same time, not being able to observe the overall outline of two signals at the same time, and not being able to observe the carrier wave and the modulating wave at the same time.

Active Publication Date: 2011-06-08
RIGOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, although this display method can meet the needs of most measurements, its weakness is clearly reflected when measuring some complex signals.
For example, when measuring an AM signal, since the oscilloscope has only one time base, only the AM signal or the carrier signal can be observed when the waveform is displayed, and the carrier and modulating waves cannot be observed at the same time, which makes analyzing the waveform more complicated.
[0004] like Figure 7 As shown, in the prior art, when the signal is observed on the window of the oscilloscope display, only the outline or details of the waveform can be observed, but the overall outline of the waveform and the details of the waveform cannot be observed at the same time
However, when the two channels observe signals of different frequencies at the same time, especially when the frequency difference is relatively large, it is often impossible to observe the overall contours of the two signals at the same time base

Method used

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  • Digital oscillograph and its waveshape displaying method
  • Digital oscillograph and its waveshape displaying method
  • Digital oscillograph and its waveshape displaying method

Examples

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Embodiment 1

[0025] Such as image 3 As shown, the present invention is a waveform display method of a digital oscilloscope. The method collects external analog signals through the analog front end of the digital oscilloscope. The analog front end is composed of a channel 1 front end (CH1), a channel 2 front end (CH2) and other front ends. The analog front end transmits the collected analog signal to an analog-to-digital converter (ADC) to convert the collected analog signal into a digital signal. The digital signals are sequentially stored to the storage depth of the digital oscilloscope. Then the control processing device generates the main frame (first frame) parameter and the delay frame (second frame) parameter after receiving the configuration instruction of the external response device, and according to the main frame parameter, the delay frame parameter and the time base, The sampling rate generates a main-frame scale and a delay-window scale, and transmits the generated main-fram...

Embodiment 2

[0029] Such as figure 2 Shown is the digital oscilloscope that realizes the method of the present invention, and this digital oscilloscope comprises: analog signal acquisition device, analog-to-digital conversion device, CPU as control processing device, memory, keyboard as external response device (also can adopt touch screen, mouse, traffic interface, etc.), LCD as a display device; the analog signal acquisition device is connected to the CPU through an analog-to-digital conversion device, and the LCD is connected to the CPU; the digital oscilloscope also includes: a waveform processing device, which is respectively connected to the described waveform processing device CPU, memory and analog-to-digital conversion device are connected.

[0030] The CPU receives the keyboard instruction to generate the first window parameter and the second window parameter, and obtains the first window zoom ratio and the second window zoom ratio according to the first window parameter and the...

Embodiment 3

[0033] The basic principle of digital oscilloscope of the present invention, refer to Figure 6 : The digital oscilloscope mainly includes analog front end, analog-to-digital conversion (ADC) signal conversion, field programmable gate array (FPGA) unit data processing and control, digital signal processing (DSP) system control, high-speed memory (SRAM), keyboard, LCD.

[0034] The main function of the analog front end is to realize the gain, offset, and bandwidth control of the signal. The control signal comes from the FPGA, and the control information is transmitted from the DSP to the FPGA.

[0035] The main function of ADC signal conversion is to convert the analog signal conditioned by the front end into a digital signal and send it to FPGA for processing.

[0036] The DSP receives the instruction of the external response device to generate the main window parameter and the delayed window parameter, and obtains the main window scaling ratio and the delayed window scaling ...

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Abstract

The invention is about the display method for waveform of digital oscillograph and the digital oscillograph. The invention is to collect the external dummy signal and transfer it to digital signal; receiving the digital signal and storing it as the digital signal data; receiving external response and generating the first window and second window data, according to which it gets the first and second window pantograph ratio; reading the digital signal data and pantograph the data according to the ratio to generate the first and second displaying data; the waveform and / or data corresponding to the first displaying data is displayed on first window; the second data is displayed on second window. So it can display the waveform on two windows in different time to make the oscillograph intuitionand convenience.

Description

technical field [0001] The invention relates to digital oscilloscope technology, in particular to waveform processing and display of the digital oscilloscope, in particular to a digital oscilloscope waveform display method and the digital oscilloscope. Background technique [0002] In the prior art, the main components of a digital oscilloscope are as follows figure 1 As shown, it includes: control processing unit, external analog signal input unit (analog front end), LCD display unit, keyboard input unit and power supply, wherein: control processing unit is made up of CPU, memory, logic circuit; Analog front end is made up of probe 102 , a VGA amplifier 101 and an analog-to-digital converter (A / D). [0003] Digital oscilloscopes in the prior art generally display waveforms in the traditional display mode of a single window, that is to say, signals of channels CH1, CH2, CH3, CH4, MATH, etc. are all displayed in the same window. Since the oscilloscope has only one time base...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R13/02
Inventor 王悦王铁军李维森
Owner RIGOL
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