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Immunity test to narrowband radiated electromagnetic energy-large current injection (BCI) 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 - BCI high current injection method [according to GBT 33014.4/ISO 11452-4]
serial number	product	illustrate	brand
1	SMC100A	Signal source, 9KHz~1.1GHz	Rohde&Schwarz / Germany
2	BBA150- A125B125	Dual-band power amplifier, 9 kHz~250 MHz, 125 W; 80 MHz~400 MHz, 125 W, air-cooled	Rohde&Schwarz / Germany
3	NRP6AN	Average Power Sensor, 8kHz~ 6GHz, 100pw~200mW, N(m)	Rohde&Schwarz / Germany
4	F-120-6A	40mm current injection clamp, 10kHz~400MHz, 100W	FCC/ USA
5	FCC-BCICF-1	Current Injection Clamp Calibration Set	FCC/ USA
6	F-52B	Current monitoring probe, 100KHz~500MHz, inner diameter/outer diameter/thickness: 32/71/19mm, 19dBΩ, N-type connector	FCC/ USA
7	EMC32-S	EMS test software, including license	Rohde&Schwarz / Germany

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