ABB DT370A GJR2237600R1 数字量扩展模块

ABB  DT370A   GJR2237600R1  数字量扩展模块

ABB  DT370A   GJR2237600R1  数字量扩展模块

ABB  DT370A   GJR2237600R1  数字量扩展模块

品牌

ABB

型号

DT370a GJR2237600R1

控制原理

其他

加工定制

否

用途

自动电压调节

量程

100-217 KP

精确度

1.0-4.7

规格尺寸

200*20*67mm

厂家

ABB

　　DT370a GJR2237600R1 数字量扩展模块 ABB

产品介绍：

　　DT370a GJR2237600R1 具有高共模抑制比和洽的抗搅扰性。低通滤波器选用压控电压源型二阶低通滤波器。50Hz工频信号对外表肌电信号的收集有很大的影响，它的频率恰好在外表肌电信号能量集中的频段，且其幅度比外表肌电信号大1－3个量级，因而有必要除去。本设计中选用双T有源滤波器来滤除50Hz的工频信号

　　下面来分析或许引进工频搅扰的途径：1由空间辐射引进：空间的电磁场可以经过检测设备中的电极连线、印刷电路板上的连线、器材引脚或器材自身感应为相应频率成分的电流，成为噪声混入肌电信号。空间的电磁场或许来自于多种源，*致命的是电网辐射形成的工频搅扰。2由直流电源引进：检测设备中，为有源器材供电的直流电源一般都是由工频交流电源变压、整流、稳压而得到的。直流稳压电源不或许到达抱负的滤波作用。以纹波方式存在的工频（或其谐波）电流会经过电源引进到放大电路中。3由受试者身体引进：露出于空间电磁场中的受试者身体同样会感应电磁场而产生感应电流，受试者身体所感应的工频电流经过检测电极，与生物电信号一起加到放大器输入端，形成工频搅扰。

　　针对直流电源引进的工频搅扰，选用电池对有源器材进行供电。选用电池供电不只避免了整流稳压电源纹波所带来的工频搅扰问题，并且还消除了因漏电而导致受试者被电击伤的或许。由于电池的电压较低，用多节电池又会显得体积巨大，所以选用DC/DC模块来升压解决芯片的供电问题。

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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