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工业测量和过程控制系统信号链路显示了具有单独的或“通道对通道”隔离输入的典型12位过程测量和控制系统的主要组成部分.这种系统结构经常用于各种存在“高电压危险”的测量环境,例如造纸、化工、石油、冶金、电力设施监控以及大功率电机控制.当待测的常规信号相对于测量地存在很大的共模电压(CMV)时,需要对输入信号间进行电隔离.例如测量500V电机的分流器电阻压降,此时分压信号(代表电机速度)可能只有几伏,却存在高达500V的共模电压.隔离可以“消除”不需要的共模电压或载频电压,允许很方便地单纯测量分流器电压本身.AD102/4,AD202/4和AD210都带有这类输入隔离,并具有不同的CMV额定范围和带宽.在有些应用场合,信号来自未知信号源或可能遭受损坏电子器件意外的电子故障情况下,也要求在输入信号之间进行隔离.
Industrial Measurement and Process Control Systems The signal link shows the main components of a typical 12-bit process measurement and control system with separate or “channel-to-channel” isolated inputs, which are often used in a variety of applications where there is a “high voltage hazard ”, Such as papermaking, chemical, petroleum, metallurgy, power plant monitoring, and high-power motor control When the common signal to be measured has a large common-mode voltage (CMV) relative to the measurement ground, For example, to measure the shunt resistor drop across a 500V motor, the voltage divider (representing the motor speed) may be only a few volts, while the common-mode voltage may be as high as 500V. Isolation “eliminates” the unwanted common-mode voltage Or carrier frequency to allow simple measurement of the shunt voltage itself. The AD102 / 4, AD202 / 4, and AD210 are all isolated with this type of input isolation and have different CMV ratings and bandwidths. In some applications, the signal comes from It is also required that there be isolation between the incoming signals in the event of an unknown electronic source of unknown signal source or potentially damaging electronics.