抗扰 辐射抗扰
主 题
TOPICS
1. 发射干扰 Emission 2. 抗扰 Immunity 3. 10m半波暗室 10m SAC 4. 屏蔽室 Local Shielded Room
ቤተ መጻሕፍቲ ባይዱ
1. 发射干扰
Emission
发射干扰是指产品或系统沿着电力线传输或通过空间传输的射频电磁能量 ，并对其所处的电磁环境造成干扰或污染。
0.8m Vertical Ground Plane > 0.4m EUT
0.8m
Mains excess lead bundled to < 40mm LISN
Supply Mains Receiver
Horizontal Ground Plane
1.1 传导发射测试
限值线
Limit Lines
Measurement Distance = 10m
EUT 0.8m
1m to 4m
mains
Turntable
Ground Plane
1.2 辐射发射测试
Radiated Emission Test
以峰值检坡器测量时使用的决策树。
Decision tree for peak detector measurement.
A test is to measure the potential interference generated inside an EUT and carried through the I/O lines, the control leads, or power lines. This test is required to ensure that the conducted emission of the tested EUT meets pre-defined limits as set by various national and international standards e.g. CISPR 22 or EN 55022.
1.4 非连续干扰测试 1.5 电流谐波测试 电流谐波测试 谐波 1.6 电压闪爍测试
Harmonics Current Test (Conducted) Flicker Test (Conducted)
1.1 传导发射测试
Conducted Emission Test
这项测试检测产生于EUT(待测物)内部并且通过I/O线，控制线或电源线传 输的干扰。要求EUT产生的传导发射干扰小于如CISPR 22 or EN 55022 等国际标准所规定的限值。
EMI Receiver Spectrum Analyzer
LISN (Line Impedance Stabilizing Network)
RF Switch
1.2 辐射发射测试
Radiated Emission Test
这项测试检测EUT产生的通过空间传播的干扰信号,这些信号由天线接收， 由接收机测量，从而保证能符合例如CISPR 22等相关EMC标准。天线放置在 离EUT 10米远的地方，在1米到4米间的高度上测量水平和垂直两个方向。 放置在转台桌子上的EUT随着桌子做360度的旋转。
EMC包括电磁干扰（EMI）和抗电磁干扰（EMS）两个部分。
It covers both Electro-Magnetic Interference (EMI) and Electro-Magnetic Susceptibility (EMS).
什么是EMC What is EMC?
电磁兼容
发射干扰 传导发射 辐射发射 传导抗扰
Measurement Distance = 5m Absorbing Clamp
Radiated Emission Test
Equipment Capability Frequency Range: 9kHz to 2.75GHz Dual Channel Frequency Range: 9kHz to 3GHz Frequency Range: 100kHz to 1.3GHz Frequency Range: 30MHz to 2GHz Frequency Range: 30MHz to 1GHz Manufacturer Schaffner Toyo Advantest Agilent Schaffner Schaffner
Y N
Y
N
1.2 辐射发射测试
Equipment List EMI Receiver - SCR 3512 RF Switch – NS 4901 Spectrum Analyzer – R 3132A Pre-amplifier – 8447D Bilog Antenna – CBL 6112B Attenuation Clamp – CMAD 10-3
Conducted Emission Test
Sample plot for EN 55022
1.1 传导发射测试
Equipment List EMI Receiver - SCR 3052C RF Switch – NS 4901 Spectrum Analyzer – R 3131A LISN – NNB 42C
辐射发射-辐射发射的限值是在30MHz到1GHz频率范围内规定的，它 保证了设备不会干扰到附近运行的系统。
Radiated Emission - Radiated emissions standards impose limits on the radiated disturbances in the 30MHz to 1 GHz frequency range. This ensures that the equipment will not interfere with the operation of systems in its vicinity.
Emission is the radio frequency energy of a product or system being transmitted along the power cord or through space as unwanted electromagnetic pollution/ interferences.
CISPR 14-1 或 EN 55014-1标准所涉及的家用电器，电动工具以及类似设 备需要进行此项测试。
This test is applicable to household appliances, electric tools and similar apparatus to meet the emission standard CISPR 14-1 or EN 55014-1.
Introduction to EMC
December 2008
电磁兼容(EMC)介绍 Introduction To EMC
什么是EMC What is EMC?
电磁兼容EMC(Electromagnetic Compatibility)的定义：装置能在身处的 电磁环境中正常工作而本身产生的电磁干扰不影响环境中其他装置的正 常工作。
A measurement of disturbances power on connected cables, using an absorbing clamp. Continuous disturbance may be either broadband, caused by switching devices such as mechanical switches, commutators or semiconductor regulators, or may be narrowband, caused by electronic control devices such as microprocessors.
A test that looks for disturbance signals that are transmitted by the EUT through space. These signals are then received by the antenna and measured with a receiver to ensure that they are below the acceptable limits set by the relevant EMC standard, e.g. CISPR 22. The antenna is positioned 10m from the EUT and is oriented in both horizontal and vertical polarization for a height from 1m to 4m. The EUT will be rotated in 360 degree on the turn table.
发射干扰可以分为两部分：
Emission requirements can be divided into two categories:
传导发射-传导发射标准的限值规定了150KHz到30MHz的频率范围内通 过与系统连接的电缆（电源线、信号线等）耦合的传导干扰。
Conducted Emissions - Conducted emissions standards limit the conducted disturbances in the 150 KHz to 30 MHz frequency range. This limits the emissions coupled through cable (mains, signal cables) connecting to the system.
1. 发射干扰
Emission
1.1 传导发射测试 1.2 辐射发射测试 1.3 干扰功率测试