描述
干扰源及干扰一般分类影响DCS控制系统的干扰源与一般影响电力控制设备的干扰源一样，大都产生在电流或电压剧烈变化的部位，这些电荷剧烈移动的部位就是噪声源，即干扰源。干扰类型通常按噪声干扰模式不同，分为共模干扰和差模干扰。共模干扰和差模干扰是一种比较常用的分类方法。共模干扰是信号对地的电位差，主要由电网串入，地电位差及空间电磁辐射在信号线上感应的共态（同方向）电压叠加所形成。共模电压通过不对称电路可转换成差模电压，直接影响测控信号，造成元器件损坏（这就是一些系统I/O模件损坏率较高的主要原因），这种共模干扰可为直流，亦可为交流。差模干扰是指作用于信号两极间的干扰电压，主要由空间电磁场在信号间耦合感应及由不平衡电路转换共模干扰所形成的电压，它们直接叠加在信号上，直接影响测量与控制精度。
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Watkins Johnson WJ952 MFC regulator PWB 903168-001
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TV250 controller pump 9699425S004
Sciex DACS & VACUUM GAUGE 025173
IAI SEL-GDS-3-AC-200. 30. 20-2
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ICT teradyne 4590059T Rev: 24-10-01
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Rofin Sinar Laser LLM A.Nr. 3040780
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Agilent 54621A megazoom 60MHz 200MSa/s self test passed
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445-04403 multibus bd BIT-3
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