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Radiation Emission

1. Introduction to the test

　　CISPR 11, CISPR 22 and other standards stipulate that the EUT needs to conduct radiation emission tests above 30MHz in an open field or an anechoic chamber. The EUT is placed on the ground plane at a specified height and arranged to simulate normal operating conditions. Antennas are placed at specified distances. Rotate the EUT in the horizontal plane and note the maximum reading. Then adjust the height of the antenna so that the direct wave and the ground reflected wave are close to or reach the same phase superposition, and find out the maximum disturbance value.

　　Measurement distance: refers to the distance between the point of the EUT closest to the antenna and the projection of the center of the antenna on the ground. The 10-meter method is preferred, and the 3-meter method is optional.

　　Antenna Height: The height of the antenna from the ground should vary within the specified range to obtain the maximum reading that would occur if the direct and reflected waves were in phase. When the measurement distance is less than or equal to 10 meters, the antenna height is preferably changed between 1m and 4m.

2. System connection diagram

3. Typical configuration

Radiated Emission Test System
serial number	product	illustrate	brand
1	ESR7	EMI fully compatible test receiver, frequency range 9 kHz~7GHz	Rohde&Schwarz/Germany
2	EMC32	EMI measurement software for civilian and military standards, with hardware protection dog	Rohde&Schwarz/Germany
3	SCU-01F	Preamplifier, frequency range: 1k~1GHz	Rohde&Schwarz/Germany
4	SCU-08F	Preamplifier, frequency range: 100M~8GHz	Rohde&Schwarz/Germany
5	HL562E	High-precision logarithmic periodic antenna, 30MHz~6GHz; mainly used for EMI radiation measurement, long-term monitoring of wireless signals	Rohde&Schwarz/Germany
6	CE-TAB	CE test environment, including solid wood test table, insulation support, etc.	Century Huize/China
7	SAC 3	3m method anechoic chamber, the size can be customized according to the customer site	Frankonia/Germany

Century Wisdom (Suzhou) Testing Technology Co., Ltd

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