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Component/Module Radiated Emissions - ALSE Method

1. Introduction to the test

The application environment of the on-board power supply system is more complicated than that of the ordinary power supply system, because the electromagnetic environment in the car is relatively harsh, and the electrical equipment of the car will generate a lot of electromagnetic interference during operation. , spread to the power system, and then affect the normal operation of electronic equipment. The electronic control part mainly includes the controller PLC, switching power supply, relay group, sensors from the mechanical engineering part, the display on the console, the GPS in the cab, etc. These devices will inevitably generate electromagnetic disturbances when they are working. Disturbances may be transmitted in the form of conduction or radiation. Since they are all affected by the internal components of the car, the distance of radiation emission is limited to the inside of the car, and the distance will not be very long. According to the CISPR25 standard, the radiation emission needs to be tested in an anechoic chamber with the 1m method.

■ 0.15MHz～30MHz 1m long vertical monopole antenna

■ 30MHz～200MHz biconical antenna

■ 200MHz～1000MHz logarithmic periodic antenna

■ 1000MHz～2500MHz horn or logarithmic periodic antenna.

2. System connection diagram

3. Typical configuration

Radiation Emission [Based on GB 18655/ CISPR 25]
serial number	product	illustrate	brand
1	ESR7	EMI fully compatible test receiver, frequency range 9 kHz~7GHz	Rohde&Schwarz/Germany
2	EMC32	EMI test software, suitable for all civil standards/automotive standards/military standards, the software needs to be used with a key	Rohde&Schwarz/Germany
3	HFH2-Z6E	Active rod antenna, 8.3kHz~30MHz, according to the standard MIL, DEF, etc.	Rohde&Schwarz/Germany
4	HK116E	Biconical antenna, 20MHz~300MHz	Rohde&Schwarz/Germany
5	HL223	Log periodic antenna, 200 MHz~1.3GHz	Rohde&Schwarz/Germany
6	HF907	Broadband horn antenna, 1~18 GHz, N-type connector	Rohde&Schwarz/Germany
7	SCU01F	Preamplifier, 10M~1GHz, 29dB gain	Rohde&Schwarz/Germany
8	SCU08F1	Preamplifier, 0.1~8GHz, 32dB gain	Rohde&Schwarz/Germany

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