A high-precision measurement method of signal and digital oscilloscope

A measurement method, high-precision technology, applied in digital variable display, digital variable/waveform display, measuring device, etc., can solve the problem of high price

Active Publication Date: 2021-08-03
SHENZHEN CITY SIGLENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If an ADC with 12-bit resolution is used, the quantization error of the ADC is 800mV / 3200=0.25mV at a full-screen voltage of 100mV / div. Although this can greatly reduce the quantization error and improve the vertical measurement accuracy, the digital oscilloscope’s The price is very high, the price of the 12-bit resolution ADS5400 digital oscilloscope of the TI brand is $952.16, while the price of the same brand's 8-bit resolution ADC081000 digital oscilloscope is only $87.12

Method used

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  • A high-precision measurement method of signal and digital oscilloscope
  • A high-precision measurement method of signal and digital oscilloscope
  • A high-precision measurement method of signal and digital oscilloscope

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Embodiment 1

[0034] Please refer to figure 1 , this embodiment discloses a digital oscilloscope, the digital oscilloscope 1 mainly includes an impedance transformation network 11, an analog-to-digital converter 12, a processing unit 13, a digital-to-analog converter 14 and a bias adjustment circuit 15, which will be described separately below.

[0035] The digital-to-analog converter 14 is also called a DAC device, which is connected with the processing unit 13, and the digital-to-analog converter 14 is sent a digital control code word by the processing unit 14, and then the digital-to-analog converter 14 converts the control code word into each Bias signal used for voltage bias adjustment. The control code word here is the input command of the DAC device, which can be a digital combination code. Different coding forms make the DAC device output bias signals with different adjustment functions; the bias signal here is an analog electrical signal and can determine the voltage bias. orienta...

Embodiment 2

[0058] On the basis of the digital oscilloscope disclosed in Embodiment 1, this embodiment discloses a high-precision signal measurement method, and the execution carrier of the high-precision measurement method is Figure 1 to Figure 3 The processing unit 13 of the digital oscilloscope 1 . Please refer to Figure 5 , the high-precision measurement method in this embodiment mainly includes steps 210-240, which will be described respectively below.

[0059] Step 210, the configuration module 131 in the processing unit 13 obtains the quantization error of the analog signal during ADC processing and the minimum offset during voltage offset adjustment, and configures the analog voltage corresponding to the ADC code value of the first sampling point on the analog signal The offset number N1 within the range that enables voltage bias adjustment with the minimum offset.

[0060] Step 220, the allocation module 132 in the processing unit 13 divides the analog voltage range into equa...

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Abstract

This application relates to a high-precision measurement method of a signal and a digital oscilloscope, wherein the high-precision measurement method uses a single offset allocated each time to adjust the voltage bias of the analog signal multiple times, and the ADC code value at the sampling point is about to When a jump occurs or just occurs, the total offset of the superimposed signal relative to the analog signal is obtained, and the actual voltage value of the sampling point is further obtained. The technical solution of this application uses the voltage bias adjustment method to more accurately determine the amplitude of any sampling point on the analog signal without improving the resolution of the ADC, so as to obtain the actual voltage value of the sampling point with a smaller measurement error. The vertical measurement accuracy is effectively improved without increasing the hardware cost of the digital oscilloscope, so that the low-end digital oscilloscope can still play a role in high-precision measurement occasions.

Description

technical field [0001] The present application relates to the technical field of oscilloscopes, in particular to a high-precision signal measurement method and a digital oscilloscope. Background technique [0002] Oscilloscope is an indispensable tool for designing, manufacturing and repairing electronic equipment. Today’s oscilloscopes are mostly digital oscilloscopes, which are becoming more and more popular because of their waveform triggering, storage, display, measurement, analysis and other functions. With the development of technology and market demand Rapidly developing, digital oscilloscopes are regarded as the eyes of engineers, and they will be used as a necessary tool to meet the measurement challenges of engineers. [0003] Digital oscilloscopes can convert and display analog electrical signals digitally and visually. With the increasing complexity of the circuit system under test, engineers have more and more stringent requirements for circuit measurement accur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R13/02
CPCG01R13/0209G01R13/0218
Inventor 曾显华罗森刘山
Owner SHENZHEN CITY SIGLENT TECH
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