1794-IT8
1794-IT8
1794-IT8
2.静电感应(指电的耦合)。静电感应是两电场相互作用的结果。在相对的两根导线中,如其一的电位发生变化,则由于导线间的电容变化使得另一导线的电位也发生变化,干扰源以电容性的耦合在回路中形成干扰。
3.附加热电势和化学电势。由于不同金属产生的热电势以及金属腐蚀等产生的化学电势,在电路回路中形成直流电气干扰。
4.振动。在强振动的环境中,导线由于在磁场中处于运动状态而产生感应电势,此干扰与信号相串联,以串模干扰形式进入仪器仪表。
5.不同地电位引入的干扰。在大功率的用电设备附近,当设备的绝缘性能较差时,不同地电位的电位差的引入形成干扰,而在仪表的使用中往往会有意无意地使输入端存在两个以上的连接点,这样就会把不同接地点的电位差以共模干扰形式引入到仪器仪表,这种干扰是同时出现在两信号线上的。
6.信号源是不平衡电桥。当桥路电源接地时,除桥路对角线的不平衡电压(即信号电压)外,两信号线对地都有一个公共的共模干扰电压。虽然共模干扰不和信号叠加,不直接对仪表产生影响,但它能通过测量系统形成到地的漏电电流,通过电阻的耦合就能直接作用于仪表(或放大器),产生干扰。
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Agilent E6432A VXI Microwave Synthesizer
Agilent E6404C IF Processor Digitizer/DSP
HP / Agilent E1429A/E1429B 20 MSa/s 2-channel Digitizer
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Analogic DBS9900 VXI C-Size Module
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TTC Fireberd 6000A Communications Analyzer sn: 07498
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HP C E1428A Digitizing Oscilloscope 1 Gsa/s 250 MHz
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HP 75000 Series C E1430A 10MSa/s ADC + Filter + FIFO
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HP/Agilent E6404A IF Processor OPT 284
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