Bulk Current Injection (BCI) Test System

The LSBCI-40 Bulk Current Injection (BCI) test system is an electromagnetic immunity tester designed by LISUN specifically for the automotive electronics, rail transit, and industrial control sectors. The function is to simulate the radio frequency (RF) interference experienced by electronic devices in complex electromagnetic environments. By injecting a specified RF current into the cable bundle of the device under test (DUT), the system assesses the device’s operational stability under RF interference and proactively identifies functional anomalies (such as signal distortion and control failure) caused by electromagnetic compatibility issues, providing critical testing support for products passing international EMC certification.

Standards:

System configurations and technical parameters:

Part 1: Test steps:
A. Before the test, verify that the disturbance current generated by the current injection probe meets the requirements in the calibration fixture, and then clamp the current probe to the specified position of the harness to be tested
B. Apply interference to the harness based on the forward power obtained by calibration. The current intensity is not monitored during the test, and the forward power is no longer adjusted
C. The length of the harness and the relative distance between the current injection probe and the harness to be tested will affect the coupling degree of the disturbance electromagnetic field on the harness to be tested

Part 2: Test result determination: The open-loop method is mainly divided into 5 levels, each level represents a different test result.
A. The function or performance of the EUT has been normal without any abnormality.
B. All functions or performances are in the interference state, one or more functions/performances deviate from the specified tolerance, but all functions or performances are restored to the specified tolerance limit after the interference is removed, and there should be no abnormality in the stored data.
C. One or more functions/performances are lost, but the EUT automatically recovers to normal mode after the interference is applied.
D. One or more functions/performances are lost, but they are restored to normal mode through human intervention after the interference is applied.
E. One or more functions/performances are lost, but they cannot be restored to normal mode after the interference is applied.

Part 3: Test system layout (refer to ISO 11452-4 Figure 2, Figure 1 and Figure 3):
1. Reference ground plane: The reference ground plane uses a metal plate with a thickness greater than 0.5mm, preferably brass. The length and width of the test bench and the reference ground plane are at least 1700×1000mm; the impedance of the grounding material is not greater than 2.5 milliohms, and the interval is not greater than 300mm;
2. Artificial power network: For remote grounding, 2 artificial power networks are required, and for near-end grounding, only 1 artificial power network (connected to the positive pole) is required;
3. Placement of EUT: The product under test should be placed on an insulating material with a low dielectric constant (not greater than 1.4) and a thickness of 50 (±5) mm. The total length of the test harness EUT and the simulated load harness should be: 1000 (±100) mm, and the test harness should be placed on an insulating material with a dielectric constant (not greater than 1.4) and a thickness of 50 (±5) mm.
4. High current injection probe: The distance d between the injection probe and the EUT is as follows:
d=(150±10)mm
d=(450±10)mm
d=(750±10)mm

ISO 11452-4:2020 Figrue 2

Part 4: Test Report Samples:

LSBCI-40 Data

LSBCI-40 Open Loop Test

LSBCI-40 Closed Loop Test