ABB  DT370A   GJR2237600R1  數字量擴展模塊

ABB  DT370A   GJR2237600R1  數字量擴展模塊

ABB  DT370A   GJR2237600R1  數字量擴展模塊

品牌

ABB

型號

DT370a GJR2237600R1

控制原理

其他

加工定制

否

用途

自動電壓調節

量程

100-217 KP

精確度

1.0-4.7

規格尺寸

200*20*67mm

廠家

ABB

　　DT370a GJR2237600R1 數字量擴展模塊 ABB

產品介紹：

　　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工頻信號對外表肌電信號的收集有很大的影響，它的頻率恰好在外表肌電信號能量集中的頻段，且其幅度比外表肌電信號大1－3個量級，因而有必要除去。本設計中選用雙T有源濾波器來濾除50Hz的工頻信號

　　下面來分析或許引進工頻攪擾的途徑：1由空間輻射引進：空間的電磁場可以經過檢測設備中的電極連線、印刷電路板上的連線、器材引腳或器材自身感應為相應頻率成分的電流，成為噪聲混入肌電信號。空間的電磁場或許來自于多種源，*致命的是電網輻射形成的工頻攪擾。2由直流電源引進：檢測設備中，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、穩壓而得到的。直流穩壓電源不或許到達抱負的濾波作用。以紋波方式存在的工頻（或其諧波）電流會經過電源引進到放大電路中。3由受試者身體引進：露出于空間電磁場中的受試者身體同樣會感應電磁場而產生感應電流，受試者身體所感應的工頻電流經過檢測電極，與生物電信號一起加到放大器輸入端，形成工頻攪擾。

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

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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