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Digital isolation channel oscilloscope and digital oscilloscope channel isolation system

A digital oscilloscope and isolation system technology, applied in the direction of digital variable display, etc., can solve the problems of parasitic coupling of isolation amplifier, low performance of isolation channel oscilloscope, poor linearity and frequency band characteristics of optical isolation linear amplifier, etc., and achieve the effect of cost saving

Inactive Publication Date: 2010-02-17
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] In order to overcome the current technical level of the method of using isolation amplifiers in the prior art, the linearity and frequency band characteristics of the optical isolation linear amplifier are poor, making the performance of the isolation channel oscilloscope far lower than that of ordinary oscilloscopes. The isolation amplifier has front and rear stages. The severe parasitic coupling phenomenon between the channels leads to poor AC isolation characteristics between the channels of the traditional isolated oscilloscope; these technical problems that the performance of the isolated channel oscilloscopes in the current market are generally low, the present invention provides a digital oscilloscope and digital oscilloscope channel isolation system

Method used

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  • Digital isolation channel oscilloscope and digital oscilloscope channel isolation system
  • Digital isolation channel oscilloscope and digital oscilloscope channel isolation system
  • Digital isolation channel oscilloscope and digital oscilloscope channel isolation system

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Embodiment 1

[0022] refer to figure 2 , this embodiment 1 is a 2-channel isolated digital oscilloscope: the signal is input through CH1 and CH2, and is directly sent to the analog-to-digital converter after being conditioned and amplified by the analog front end. The structure is the same as that of a common non-isolated digital oscilloscope, and no isolation amplifier is used, so the performance index is not affected. The analog-to-digital converter converts the input signal into a digital signal and sends it to the sampling and storage controller to realize data storage. Different from traditional isolated oscilloscopes, multiple channels of traditional isolated oscilloscopes usually share a set of sampling and storage controllers. Here, in order to achieve isolation, each channel must use an independent sampling and storage controller.

[0023] The data sent out after storage is not directly sent to the imaging and display control unit, but passes through an optical isolator composed ...

Embodiment 2

[0025] refer to image 3 , the present embodiment 2 is a 4-channel isolated digital oscilloscope: each of the 4 channels uses a channel board, and each channel board includes functions such as an analog front end, an analog-to-digital converter, a sampling and storage controller, and an optical transceiver, realizing a The complete signal acquisition process of the channel. The back-end processing tasks such as imaging, data processing and display are completed by the main control computer. The main control computer contains 4 optical transceivers to receive the collected data of the channel board. The main control computer and the channel board are connected by single-mode optical fiber. The optical fiber transmission protocol can use the Gigabit Ethernet protocol or a self-defined serial communication protocol. The latter is used in this embodiment, and its data rate is 3.125 Gbps, which fully meets the requirements of data exchange. 5-way high-isolation power supplies ge...

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Abstract

The invention discloses a digital oscilloscope channel isolation system comprising an analog-to-digital conversion unit, a sampling and storage control unit, an optical isolation unit and an imaging and display control unit. The analog-to-digital conversion unit, the sampling and storage control unit, the light isolation unit and the imaging and display control unit are sequentially connected in series; a digital isolation channel oscilloscope comprises an analog front end, an imaging and display control unit, a display unit, an analog-to-digital conversion unit, a sampling and storage controlunit and an optical isolation unit; the analog front end, the analog-to-digital conversion unit, the sampling and storage control unit, the optical isolation unit, the imaging and display control unit and the display unit are sequentially connected in series. The indexes of the digital isolation channel oscilloscope and the digital oscilloscope channel isolation system such as the band width, thesampling rate and the like have no connection with isolation; the digital isolation channel oscilloscope and the digital oscilloscope channel isolation system can totally meet the requirements of a digital signaling link and save the cost and has no intercoupling phenomena on the signaling link; and the isolation between channels only depends on the isolation of an isolation power supply.

Description

technical field [0001] The invention relates to the field of electronic measuring instruments of electrotechnical technology, in particular to a digital oscilloscope and a digital oscilloscope channel isolation system. Background technique [0002] Oscilloscopes are one of the most commonly used electronic measurement instruments. Traditional oscilloscopes can only be used for ground-referenced measurements because each channel shares a common ground. For high common-mode signals and signals with higher than safe voltages to ground, the most appropriate measurement tool is an isolated channel oscilloscope. The channels of the oscilloscope and the channels are electrically isolated from the ground, which has high safety and common mode rejection ratio. Therefore, the isolated channel oscilloscope has been widely used in the fields of strong electricity and high voltage. [0003] Traditional isolation channel oscilloscopes are usually implemented with an isolation amplifier,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R13/02
Inventor 戴戈
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI