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DUT上发出的辐射信号大部分被耦合到磁场探头上,少量能量扩散到自由空间。磁场探头耦合了近H场的磁通线以及PCB上的电流,另外它也获取一些近E场的微量成分。大电流低电压电流源主要与磁场相关,而高电压小电流电压源则主要与电场相关,在PCB上,纯电场或者纯磁场都是很少见的。RF和微波电路中,电路的输入阻抗以及连接用的微带或者微带线,其阻抗都被设计为50欧姆,这种低阻抗设计使得这些元器件产生大电流和低电压变化,此外数字电路的趋势也是使用更低电压差的逻辑器件,同时活性近场区域内的磁场波阻抗远小于电场波阻抗。综合这些因素,大部分PCB活性近场区域能量都包含在近磁场中,因此Emscan扫描系统采用的磁场环适合于这些PCB的近场诊断。
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更换电池时,日历、时间及检测数据能永久保存。工XH-3206便携式表面沾污仪仪器简介XH-3206便携式αβ表面污染测量仪采用闪烁探测法。用来检测放射性工作场所和实验室的工作台面、地板、墙面、手、衣服、鞋等表面受α或β放射性污染的程度。本仪表为液晶显示小型可携仪表,仪器显示测量结果时发出音响讯号。液晶显示高压值和电池欠压提示。电路采用微分测量法,利用脉冲形状甄别电路,配REN500F辐射剂量率仪REN500F型智能化伽马辐射仪采用高灵敏的闪烁晶体作为探测器,反应速度快,与国内同类仪器相比,该仪器具有更宽的剂量率测量范围。该仪器主要用来测量伽马射线,对伽马射线有非常高的灵敏度。此外通过配套的RenRiRate剂量率管理软件可将存储的数据读出后分析。
造成设备功能故障或者工作不稳定,而且所有信号对外形成很强电磁辐射,使得EMC测试也成为产品上市的一个障碍。目前大部分硬件工程师还只是凭经验来设计PCB,在调试过程中,很多需要观测的信号线或者芯片引脚被埋在PCB中间层,无法使用示波器等工具去探测,如果产品不能通过功能测试,他们也没有有效的手段去查找问题的原因。要想验证产品的EMC特性,只有把产品拿到标准电磁兼容测量室去测量,由于这种测量只能测产品对外辐射情况,就算没有通过也不能为解决问题提供有用的信息,因此工程师只能凭经验去修改PCB,并重复试验。这种试验方法非常昂贵,而且可能耽误产品的上市时间。当然,现在有很多高速PCB分析和仿真设计工具,可以帮助工程师解决一些问题。
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