EMCBasicKnowledge课件.pptVIP

EMC Basic Knowledge SGS　广州 EMC 实验室 EMI的来源： 电火花：马达换向器，高压放电 振荡电路：RF, 广播通讯接收机 工作中电流的突变： 数码产品的时钟驱动电路。 需要评估EMS 的产品 带有电子控制电路的产品（不包括普通的整流滤波电路） EMC Standards 按地域分： International Standards: CISRP : CISPR 11, CISPR 13, CISPR 15, CISPR 16-1 etc. IEC: IEC 61000-4-2, IEC 6100-4-3 etc. Regional Standards: EN, FCC 47CFR, AS/NZS CISPR, GB etc. 按内容分： Basic Standards: 测试技术规范，设备要求等 IEC/EN 61000-4-2, CISPR 16-1, ANSI C63.4 etc Product standards, Product family standards, Generic standards. 具体产品所需符合的测试项目和测试限值等级等。 FCC part 15, CISRP 13, EN 55014-1, EN 61204-3, IEC 61000-6-1 etc. EMI的传播以及测量方法 辐射：频率较高 测量方法：用接收机或频谱仪读取电磁波吸收设备的电压。 电场天线测量场强或等效功率 (f 20MHz) 磁场天线测量场强 (f30MHz) 功率吸收钳 (30MHz to 300MHz , RP) 传导：频率一般较低 测量方法： 用接收机，频谱仪或专用设备通过专用网络测量干扰强度。 传导电压 (CE) 谐波电流 (Harmonics Current) 电压闪烁 (Fliker) EMI Test – Conducted Emission Test EMI Test – Conducted Emission Test 传导干扰电压测试 （电源端）: Ui = 接收机读数 + 线衰减 + AMN插入损耗 EMI Test - Radiated Emission Test 系统外表空间辐射强度测试范围/能力: 频率: 9KHz to 30MHz; 30MHz to 1GHz; 1GHz to 18GHz. Radiated Emissions on enclosure EMI Test - Radiated Emission Test EMS Test EMS 的测试方法： 按标准要求用仪器产生的干扰信号以辐射或传导方式耦合到产品，并观察产品的工作状况，根据产品在干扰信号下的性能表现与标准要求的最低性能等级(performance criterion)进行比较判断其符合性。 EMS Test 测试结果的判定 CE/EMC 根据产品/产品族/通用标准的最低性能判据进行判断。例如 EN 55024 对ITE的要求 Performance Criterion A: The Equipment shall continue to operate as intended without operator intervention. No degradation of performance or loss of function is allow below a performance level specified by the manufacturer when the equipment is used as intended. The performance level may be replaced by a permissible loss of performance. If the minimum performance level or the permissible performance loss is not specified by the manufacturer, then either of these may be derived from the product description and documentation, and by what the user may reasonably expect from the equipment if used as intended. Performance Criterion B: After the test, the equipment shall continue to operate as intended with