ABB  DT370A   GJR2237600R1  數(shù)字量擴(kuò)展模塊

ABB  DT370A   GJR2237600R1  數(shù)字量擴(kuò)展模塊

ABB  DT370A   GJR2237600R1  數(shù)字量擴(kuò)展模塊

品牌

ABB

型號(hào)

DT370a GJR2237600R1

控制原理

其他

加工定制

否

用途

自動(dòng)電壓調(diào)節(jié)

量程

100-217 KP

精確度

1.0-4.7

規(guī)格尺寸

200*20*67mm

廠家

ABB

　　DT370a GJR2237600R1 數(shù)字量擴(kuò)展模塊 ABB

產(chǎn)品介紹：

　　DT370a GJR2237600R1 具有高共模抑制比和洽的抗攪擾性。低通濾波器選用壓控電壓源型二階低通濾波器。50Hz工頻信號(hào)對(duì)外表肌電信號(hào)的收集有很大的影響，它的頻率恰好在外表肌電信號(hào)能量集中的頻段，且其幅度比外表肌電信號(hào)大1－3個(gè)量級(jí)，因而有必要除去。本設(shè)計(jì)中選用雙T有源濾波器來(lái)濾除50Hz的工頻信號(hào)

　　下面來(lái)分析或許引進(jìn)工頻攪擾的途徑：1由空間輻射引進(jìn)：空間的電磁場(chǎng)可以經(jīng)過(guò)檢測(cè)設(shè)備中的電極連線、印刷電路板上的連線、器材引腳或器材自身感應(yīng)為相應(yīng)頻率成分的電流，成為噪聲混入肌電信號(hào)?？臻g的電磁場(chǎng)或許來(lái)自于多種源，*致命的是電網(wǎng)輻射形成的工頻攪擾。2由直流電源引進(jìn)：檢測(cè)設(shè)備中，為有源器材供電的直流電源一般都是由工頻交流電源變壓、整流、穩(wěn)壓而得到的。直流穩(wěn)壓電源不或許到達(dá)抱負(fù)的濾波作用。以紋波方式存在的工頻（或其諧波）電流會(huì)經(jīng)過(guò)電源引進(jìn)到放大電路中。3由受試者身體引進(jìn)：露出于空間電磁場(chǎng)中的受試者身體同樣會(huì)感應(yīng)電磁場(chǎng)而產(chǎn)生感應(yīng)電流，受試者身體所感應(yīng)的工頻電流經(jīng)過(guò)檢測(cè)電極，與生物電信號(hào)一起加到放大器輸入端，形成工頻攪擾。

　　針對(duì)直流電源引進(jìn)的工頻攪擾，選用電池對(duì)有源器材進(jìn)行供電。選用電池供電不只避免了整流穩(wěn)壓電源紋波所帶來(lái)的工頻攪擾問(wèn)題，并且還消除了因漏電而導(dǎo)致受試者被電擊傷的或許。由于電池的電壓較低，用多節(jié)電池又會(huì)顯得體積巨大，所以選用DC/DC模塊來(lái)升壓解決芯片的供電問(wèn)題。

product introduction:

　　DT370a GJR2237600R1 It has high common mode rejection ratio and consistent anti-interference. The low-pass filter adopts voltage controlled voltage source type second-order low-pass filter. 50Hz power frequency signal has a great influence on the collection of sEMG signal. Its frequency is just in the frequency band where the energy of sEMG signal is concentrated, and its amplitude is 1-3 orders of magnitude larger than that of sEMG signal, so it is necessary to remove it. In this design, double T active filter is selected to filter 50Hz power frequency signal

　　The following is the way to analyze the possible introduction of power frequency disturbance: 1. Introduction from space radiation: the electromagnetic field in space can become a noise mixed with EMG signal through the electrode connection in the detection equipment, the connection on the printed circuit board, the equipment pin or the current induced by the equipment itself as the corresponding frequency component. The electromagnetic field in space may come from many sources, and the most fatal is the power frequency disturbance caused by power grid radiation. 2. Introduction from DC power supply: in the detection equipment, the DC power supply for active equipment is generally obtained by transforming, rectifying and stabilizing the power frequency AC power supply. DC regulated power supply can not achieve the desired filtering effect. The power frequency (or its harmonic) current existing in the form of ripple will be introduced into the amplification circuit through the power supply. 3 introduced by the subject's body: the subject's body exposed in the space electromagnetic field will also induce the electromagnetic field and produce induced current. The power frequency current induced by the subject's body passes through the detection electrode and is added to the input end of the amplifier together with the bioelectric signal to form power frequency disturbance.

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