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Immunity test to narrowband radiated electromagnetic energy-anechoic chamber method

1. Introduction to the test

　　In the circuit design of automobiles/construction machinery, all circuits are powered by batteries and connected in parallel. 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 propagated through conduction or radiation. While considering how to suppress these disturbances, these modules also need to consider whether they can withstand interference from other devices/modules and the environment , such as radio frequency radiation, to ensure that it can work normally.

　　For radio frequency continuous wave immunity, considering that low frequency has higher requirements on power amplifiers, and considering comprehensive factors such as cost and result consistency, the usual test frequency bands and experimental methods are as follows:

　　ISO 11452-2, ALSE free field method, 80MHz~18GHz;

　　ISO 11452-3, TEM chamber method, 10KHz~200MHz;

　　ISO 11452-4, BCI method, 1MHz~400MHz;

　　ISO 11452-5, Stripline method, 10KHz~400MHz;

　　ISO 11452-7, BAN direct injection, 250kHz~500MHz;

　　ISO 11452-8, low frequency magnetic field immunity, 15Hz~150KHz;

　　ISO 11452-9, portable transmitter, 26MHz~5.85GHz;

　　ISO 11452-10 audio extension, 15Hz~250KHz;

2. System connection diagram

3. Typical configuration

Radio frequency immunity - ALSE free field method [according to GBT 33014.2/ISO 11452-2]
serial number	product	illustrate	brand
1	SMB100B	Signal source, 9KHz~6GHz	Rohde&Schwarz/Germany
2	OSP220	Automatic RF switch control unit, with 3 control card slots on the back of the basic version and 2 upgradeable card slots	Rohde&Schwarz/Germany
3	BBA150-BC500	Single Band Power Amplifier, 80 MHz~1 GHz, 500 W, Air Cooled	Rohde&Schwarz/Germany
4	BBA150-D110	Single Band Power Amplifier, 0,69 GHz~3,2 GHz, 110 W, Air Cooled	Rohde&Schwarz/Germany
5	NRP6AN	Average Power Sensor, 8kHz~6GHz, 100pw~200mW, N(m)	Rohde&Schwarz/Germany
6	HL046E	High gain log periodic antenna, 80MHz~3GHz	Rohde&Schwarz/Germany
7	EFS-10	Field strength probe set, 10kHz~9.25GHz, 0.5~500V/m	Frankonia/Germany
8	EMC32-S	EMS test software, including license	Rohde&Schwarz/Germany
9	ACTC	Auto parts chamber, in compliance with DIN/ISO 11452-2 and EN 55025 (CISPR 25) requirements	Frankonia/Germany

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